/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hbase;
import java.io.Closeable;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.NavigableMap;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Consistency;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.Mutation;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.RegionLocator;
import org.apache.hadoop.hbase.client.RegionReplicaUtil;
import org.apache.hadoop.hbase.client.RegionServerCallable;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.client.TableState;
import org.apache.hadoop.hbase.exceptions.DeserializationException;
import org.apache.hadoop.hbase.ipc.CoprocessorRpcChannel;
import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.protobuf.generated.ClientProtos;
import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.RegionSpecifier;
import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.RegionSpecifier.RegionSpecifierType;
import org.apache.hadoop.hbase.protobuf.generated.MultiRowMutationProtos;
import org.apache.hadoop.hbase.protobuf.generated.MultiRowMutationProtos.MutateRowsRequest;
import org.apache.hadoop.hbase.protobuf.generated.MultiRowMutationProtos.MutateRowsResponse;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
import org.apache.hadoop.hbase.util.ExceptionUtil;
import org.apache.hadoop.hbase.util.Pair;
import org.apache.hadoop.hbase.util.PairOfSameType;
import com.google.common.annotations.VisibleForTesting;
import edu.umd.cs.findbugs.annotations.NonNull;
import edu.umd.cs.findbugs.annotations.Nullable;
/**
* Read/write operations on region and assignment information store in
* <code>hbase:meta</code>.
*
* Some of the methods of this class take ZooKeeperWatcher as a param. The only reason
* for this is because when used on client-side (like from HBaseAdmin), we want to use
* short-living connection (opened before each operation, closed right after), while
* when used on HM or HRS (like in AssignmentManager) we want permanent connection.
*/
@InterfaceAudience.Private
public class MetaTableAccessor {
/*
* HBASE-10070 adds a replicaId to HRI, meaning more than one HRI can be defined for the
* same table range (table, startKey, endKey). For every range, there will be at least one
* HRI defined which is called default replica.
*
* Meta layout (as of 0.98 + HBASE-10070) is like:
*
* For each table there is single row in column family 'table' formatted:
* <tableName> including namespace and columns are:
* table: state => contains table state
*
* For each table range, there is a single row, formatted like:
* <tableName>,<startKey>,<regionId>,<encodedRegionName>. This row corresponds to the regionName
* of the default region replica.
* Columns are:
* info:regioninfo => contains serialized HRI for the default region replica
* info:server => contains hostname:port (in string form) for the server hosting
* the default regionInfo replica
* info:server_<replicaId> => contains hostname:port (in string form) for the server hosting the
* regionInfo replica with replicaId
* info:serverstartcode => contains server start code (in binary long form) for the server
* hosting the default regionInfo replica
* info:serverstartcode_<replicaId> => contains server start code (in binary long form) for the
* server hosting the regionInfo replica with replicaId
* info:seqnumDuringOpen => contains seqNum (in binary long form) for the region at the time
* the server opened the region with default replicaId
* info:seqnumDuringOpen_<replicaId> => contains seqNum (in binary long form) for the region at
* the time the server opened the region with replicaId
* info:splitA => contains a serialized HRI for the first daughter region if the
* region is split
* info:splitB => contains a serialized HRI for the second daughter region if the
* region is split
* info:mergeA => contains a serialized HRI for the first parent region if the
* region is the result of a merge
* info:mergeB => contains a serialized HRI for the second parent region if the
* region is the result of a merge
* The actual layout of meta should be encapsulated inside MetaTableAccessor methods,
* and should not leak out of it (through Result objects, etc)
*
* For replication serially, there are three column families "rep_barrier", "rep_position" and
* "rep_meta" whose row key is encodedRegionName.
* rep_barrier:{seqid} => in each time a RS opens a region, it saves the open sequence
* id in this region
* rep_position:{peerid} => to save the max sequence id we have pushed for each peer
* rep_meta:_TABLENAME_ => a special cell to save this region's table name, will used when
* we clean old data
* rep_meta:_DAUGHTER_ => a special cell to present this region is split or merged, in this
* cell the value is merged encoded name or two split encoded names
* separated by ","
* rep_meta:_PARENT_ => a special cell to present this region's parent region(s), in this
* cell the value is encoded name of one or two parent regions
* separated by ","
*/
private static final Log LOG = LogFactory.getLog(MetaTableAccessor.class);
private static final Log METALOG = LogFactory.getLog("org.apache.hadoop.hbase.META");
// Save its daughter/parent region(s) when split/merge
private static final byte[] daughterNameCq = Bytes.toBytes("_DAUGHTER_");
private static final byte[] parentNameCq = Bytes.toBytes("_PARENT_");
// Save its table name because we only know region's encoded name
private static final byte[] tableNameCq = Bytes.toBytes("_TABLENAME_");
static final byte [] META_REGION_PREFIX;
static {
// Copy the prefix from FIRST_META_REGIONINFO into META_REGION_PREFIX.
// FIRST_META_REGIONINFO == 'hbase:meta,,1'. META_REGION_PREFIX == 'hbase:meta,'
int len = HRegionInfo.FIRST_META_REGIONINFO.getRegionName().length - 2;
META_REGION_PREFIX = new byte [len];
System.arraycopy(HRegionInfo.FIRST_META_REGIONINFO.getRegionName(), 0,
META_REGION_PREFIX, 0, len);
}
/**
* Lists all of the table regions currently in META.
* Deprecated, keep there until some test use this.
* @param connection what we will use
* @param tableName table to list
* @return Map of all user-space regions to servers
* @throws java.io.IOException
* @deprecated use {@link #getTableRegionsAndLocations}, region can have multiple locations
*/
@Deprecated
public static NavigableMap<HRegionInfo, ServerName> allTableRegions(
Connection connection, final TableName tableName) throws IOException {
final NavigableMap<HRegionInfo, ServerName> regions = new TreeMap<>();
Visitor visitor = new TableVisitorBase(tableName) {
@Override
public boolean visitInternal(Result result) throws IOException {
RegionLocations locations = getRegionLocations(result);
if (locations == null) return true;
for (HRegionLocation loc : locations.getRegionLocations()) {
if (loc != null) {
HRegionInfo regionInfo = loc.getRegionInfo();
regions.put(regionInfo, loc.getServerName());
}
}
return true;
}
};
scanMetaForTableRegions(connection, visitor, tableName);
return regions;
}
@InterfaceAudience.Private
public enum QueryType {
ALL(HConstants.TABLE_FAMILY, HConstants.CATALOG_FAMILY),
REGION(HConstants.CATALOG_FAMILY),
TABLE(HConstants.TABLE_FAMILY);
private final byte[][] families;
QueryType(byte[]... families) {
this.families = families;
}
byte[][] getFamilies() {
return this.families;
}
}
/** The delimiter for meta columns for replicaIds > 0 */
protected static final char META_REPLICA_ID_DELIMITER = '_';
/** A regex for parsing server columns from meta. See above javadoc for meta layout */
private static final Pattern SERVER_COLUMN_PATTERN
= Pattern.compile("^server(_[0-9a-fA-F]{4})?$");
////////////////////////
// Reading operations //
////////////////////////
/**
* Performs a full scan of <code>hbase:meta</code> for regions.
* @param connection connection we're using
* @param visitor Visitor invoked against each row in regions family.
* @throws IOException
*/
public static void fullScanRegions(Connection connection,
final Visitor visitor)
throws IOException {
scanMeta(connection, null, null, QueryType.REGION, visitor);
}
/**
* Performs a full scan of <code>hbase:meta</code> for regions.
* @param connection connection we're using
* @throws IOException
*/
public static List<Result> fullScanRegions(Connection connection)
throws IOException {
return fullScan(connection, QueryType.REGION);
}
/**
* Performs a full scan of <code>hbase:meta</code> for tables.
* @param connection connection we're using
* @param visitor Visitor invoked against each row in tables family.
* @throws IOException
*/
public static void fullScanTables(Connection connection,
final Visitor visitor)
throws IOException {
scanMeta(connection, null, null, QueryType.TABLE, visitor);
}
/**
* Performs a full scan of <code>hbase:meta</code>.
* @param connection connection we're using
* @param type scanned part of meta
* @return List of {@link Result}
* @throws IOException
*/
public static List<Result> fullScan(Connection connection, QueryType type)
throws IOException {
CollectAllVisitor v = new CollectAllVisitor();
scanMeta(connection, null, null, type, v);
return v.getResults();
}
/**
* Callers should call close on the returned {@link Table} instance.
* @param connection connection we're using to access Meta
* @return An {@link Table} for <code>hbase:meta</code>
* @throws IOException
*/
static Table getMetaHTable(final Connection connection)
throws IOException {
// We used to pass whole CatalogTracker in here, now we just pass in Connection
if (connection == null) {
throw new NullPointerException("No connection");
} else if (connection.isClosed()) {
throw new IOException("connection is closed");
}
return connection.getTable(TableName.META_TABLE_NAME);
}
/**
* @param t Table to use (will be closed when done).
* @param g Get to run
* @throws IOException
*/
private static Result get(final Table t, final Get g) throws IOException {
if (t == null) return null;
try {
return t.get(g);
} finally {
t.close();
}
}
/**
* Gets the region info and assignment for the specified region.
* @param connection connection we're using
* @param regionName Region to lookup.
* @return Location and HRegionInfo for <code>regionName</code>
* @throws IOException
* @deprecated use {@link #getRegionLocation(Connection, byte[])} instead
*/
@Deprecated
public static Pair<HRegionInfo, ServerName> getRegion(Connection connection, byte [] regionName)
throws IOException {
HRegionLocation location = getRegionLocation(connection, regionName);
return location == null
? null
: new Pair<>(location.getRegionInfo(), location.getServerName());
}
/**
* Returns the HRegionLocation from meta for the given region
* @param connection connection we're using
* @param regionName region we're looking for
* @return HRegionLocation for the given region
* @throws IOException
*/
public static HRegionLocation getRegionLocation(Connection connection,
byte[] regionName) throws IOException {
byte[] row = regionName;
HRegionInfo parsedInfo = null;
try {
parsedInfo = parseRegionInfoFromRegionName(regionName);
row = getMetaKeyForRegion(parsedInfo);
} catch (Exception parseEx) {
; // Ignore. This is used with tableName passed as regionName.
}
Get get = new Get(row);
get.addFamily(HConstants.CATALOG_FAMILY);
Result r = get(getMetaHTable(connection), get);
RegionLocations locations = getRegionLocations(r);
return locations == null
? null
: locations.getRegionLocation(parsedInfo == null ? 0 : parsedInfo.getReplicaId());
}
/**
* Returns the HRegionLocation from meta for the given region
* @param connection connection we're using
* @param regionInfo region information
* @return HRegionLocation for the given region
* @throws IOException
*/
public static HRegionLocation getRegionLocation(Connection connection,
HRegionInfo regionInfo) throws IOException {
byte[] row = getMetaKeyForRegion(regionInfo);
Get get = new Get(row);
get.addFamily(HConstants.CATALOG_FAMILY);
Result r = get(getMetaHTable(connection), get);
return getRegionLocation(r, regionInfo, regionInfo.getReplicaId());
}
/** Returns the row key to use for this regionInfo */
public static byte[] getMetaKeyForRegion(HRegionInfo regionInfo) {
return RegionReplicaUtil.getRegionInfoForDefaultReplica(regionInfo).getRegionName();
}
/** Returns an HRI parsed from this regionName. Not all the fields of the HRI
* is stored in the name, so the returned object should only be used for the fields
* in the regionName.
*/
protected static HRegionInfo parseRegionInfoFromRegionName(byte[] regionName)
throws IOException {
byte[][] fields = HRegionInfo.parseRegionName(regionName);
long regionId = Long.parseLong(Bytes.toString(fields[2]));
int replicaId = fields.length > 3 ? Integer.parseInt(Bytes.toString(fields[3]), 16) : 0;
return new HRegionInfo(
TableName.valueOf(fields[0]), fields[1], fields[1], false, regionId, replicaId);
}
/**
* Gets the result in hbase:meta for the specified region.
* @param connection connection we're using
* @param regionName region we're looking for
* @return result of the specified region
* @throws IOException
*/
public static Result getRegionResult(Connection connection,
byte[] regionName) throws IOException {
Get get = new Get(regionName);
get.addFamily(HConstants.CATALOG_FAMILY);
return get(getMetaHTable(connection), get);
}
/**
* Get regions from the merge qualifier of the specified merged region
* @return null if it doesn't contain merge qualifier, else two merge regions
* @throws IOException
*/
@Nullable
public static Pair<HRegionInfo, HRegionInfo> getRegionsFromMergeQualifier(
Connection connection, byte[] regionName) throws IOException {
Result result = getRegionResult(connection, regionName);
HRegionInfo mergeA = getHRegionInfo(result, HConstants.MERGEA_QUALIFIER);
HRegionInfo mergeB = getHRegionInfo(result, HConstants.MERGEB_QUALIFIER);
if (mergeA == null && mergeB == null) {
return null;
}
return new Pair<>(mergeA, mergeB);
}
/**
* Checks if the specified table exists. Looks at the hbase:meta table hosted on
* the specified server.
* @param connection connection we're using
* @param tableName table to check
* @return true if the table exists in meta, false if not
* @throws IOException
*/
public static boolean tableExists(Connection connection,
final TableName tableName)
throws IOException {
// Catalog tables always exist.
return tableName.equals(TableName.META_TABLE_NAME)
|| getTableState(connection, tableName) != null;
}
/**
* Lists all of the regions currently in META.
*
* @param connection to connect with
* @param excludeOfflinedSplitParents False if we are to include offlined/splitparents regions,
* true and we'll leave out offlined regions from returned list
* @return List of all user-space regions.
* @throws IOException
*/
@VisibleForTesting
public static List<HRegionInfo> getAllRegions(Connection connection,
boolean excludeOfflinedSplitParents)
throws IOException {
List<Pair<HRegionInfo, ServerName>> result;
result = getTableRegionsAndLocations(connection, null,
excludeOfflinedSplitParents);
return getListOfHRegionInfos(result);
}
/**
* Gets all of the regions of the specified table. Do not use this method
* to get meta table regions, use methods in MetaTableLocator instead.
* @param connection connection we're using
* @param tableName table we're looking for
* @return Ordered list of {@link HRegionInfo}.
* @throws IOException
*/
public static List<HRegionInfo> getTableRegions(Connection connection, TableName tableName)
throws IOException {
return getTableRegions(connection, tableName, false);
}
/**
* Gets all of the regions of the specified table. Do not use this method
* to get meta table regions, use methods in MetaTableLocator instead.
* @param connection connection we're using
* @param tableName table we're looking for
* @param excludeOfflinedSplitParents If true, do not include offlined split
* parents in the return.
* @return Ordered list of {@link HRegionInfo}.
* @throws IOException
*/
public static List<HRegionInfo> getTableRegions(Connection connection,
TableName tableName, final boolean excludeOfflinedSplitParents)
throws IOException {
List<Pair<HRegionInfo, ServerName>> result =
getTableRegionsAndLocations(connection, tableName, excludeOfflinedSplitParents);
return getListOfHRegionInfos(result);
}
@Nullable
static List<HRegionInfo> getListOfHRegionInfos(final List<Pair<HRegionInfo, ServerName>> pairs) {
if (pairs == null || pairs.isEmpty()) return null;
List<HRegionInfo> result = new ArrayList<>(pairs.size());
for (Pair<HRegionInfo, ServerName> pair: pairs) {
result.add(pair.getFirst());
}
return result;
}
/**
* @param current region of current table we're working with
* @param tableName table we're checking against
* @return True if <code>current</code> tablename is equal to
* <code>tableName</code>
*/
static boolean isInsideTable(final HRegionInfo current, final TableName tableName) {
return tableName.equals(current.getTable());
}
/**
* @param tableName table we're working with
* @return start row for scanning META according to query type
*/
public static byte[] getTableStartRowForMeta(TableName tableName, QueryType type) {
if (tableName == null) {
return null;
}
switch (type) {
case REGION:
byte[] startRow = new byte[tableName.getName().length + 2];
System.arraycopy(tableName.getName(), 0, startRow, 0, tableName.getName().length);
startRow[startRow.length - 2] = HConstants.DELIMITER;
startRow[startRow.length - 1] = HConstants.DELIMITER;
return startRow;
case ALL:
case TABLE:
default:
return tableName.getName();
}
}
/**
* @param tableName table we're working with
* @return stop row for scanning META according to query type
*/
public static byte[] getTableStopRowForMeta(TableName tableName, QueryType type) {
if (tableName == null) {
return null;
}
final byte[] stopRow;
switch (type) {
case REGION:
stopRow = new byte[tableName.getName().length + 3];
System.arraycopy(tableName.getName(), 0, stopRow, 0, tableName.getName().length);
stopRow[stopRow.length - 3] = ' ';
stopRow[stopRow.length - 2] = HConstants.DELIMITER;
stopRow[stopRow.length - 1] = HConstants.DELIMITER;
break;
case ALL:
case TABLE:
default:
stopRow = new byte[tableName.getName().length + 1];
System.arraycopy(tableName.getName(), 0, stopRow, 0, tableName.getName().length);
stopRow[stopRow.length - 1] = ' ';
break;
}
return stopRow;
}
/**
* This method creates a Scan object that will only scan catalog rows that
* belong to the specified table. It doesn't specify any columns.
* This is a better alternative to just using a start row and scan until
* it hits a new table since that requires parsing the HRI to get the table
* name.
* @param tableName bytes of table's name
* @return configured Scan object
*/
@Deprecated
public static Scan getScanForTableName(Connection connection, TableName tableName) {
// Start key is just the table name with delimiters
byte[] startKey = getTableStartRowForMeta(tableName, QueryType.REGION);
// Stop key appends the smallest possible char to the table name
byte[] stopKey = getTableStopRowForMeta(tableName, QueryType.REGION);
Scan scan = getMetaScan(connection, -1);
scan.setStartRow(startKey);
scan.setStopRow(stopKey);
return scan;
}
private static Scan getMetaScan(Connection connection, int rowUpperLimit) {
Scan scan = new Scan();
int scannerCaching = connection.getConfiguration()
.getInt(HConstants.HBASE_META_SCANNER_CACHING,
HConstants.DEFAULT_HBASE_META_SCANNER_CACHING);
if (connection.getConfiguration().getBoolean(HConstants.USE_META_REPLICAS,
HConstants.DEFAULT_USE_META_REPLICAS)) {
scan.setConsistency(Consistency.TIMELINE);
}
if (rowUpperLimit > 0) {
scan.setLimit(rowUpperLimit);
scan.setReadType(Scan.ReadType.PREAD);
}
scan.setCaching(scannerCaching);
return scan;
}
/**
* Do not use this method to get meta table regions, use methods in MetaTableLocator instead.
* @param connection connection we're using
* @param tableName table we're looking for
* @return Return list of regioninfos and server.
* @throws IOException
*/
public static List<Pair<HRegionInfo, ServerName>>
getTableRegionsAndLocations(Connection connection, TableName tableName)
throws IOException {
return getTableRegionsAndLocations(connection, tableName, true);
}
/**
* Do not use this method to get meta table regions, use methods in MetaTableLocator instead.
* @param connection connection we're using
* @param tableName table to work with, can be null for getting all regions
* @param excludeOfflinedSplitParents don't return split parents
* @return Return list of regioninfos and server addresses.
* @throws IOException
*/
public static List<Pair<HRegionInfo, ServerName>> getTableRegionsAndLocations(
Connection connection, @Nullable final TableName tableName,
final boolean excludeOfflinedSplitParents) throws IOException {
if (tableName != null && tableName.equals(TableName.META_TABLE_NAME)) {
throw new IOException("This method can't be used to locate meta regions;"
+ " use MetaTableLocator instead");
}
// Make a version of CollectingVisitor that collects HRegionInfo and ServerAddress
CollectingVisitor<Pair<HRegionInfo, ServerName>> visitor =
new CollectingVisitor<Pair<HRegionInfo, ServerName>>() {
private RegionLocations current = null;
@Override
public boolean visit(Result r) throws IOException {
current = getRegionLocations(r);
if (current == null || current.getRegionLocation().getRegionInfo() == null) {
LOG.warn("No serialized HRegionInfo in " + r);
return true;
}
HRegionInfo hri = current.getRegionLocation().getRegionInfo();
if (excludeOfflinedSplitParents && hri.isSplitParent()) return true;
// Else call super and add this Result to the collection.
return super.visit(r);
}
@Override
void add(Result r) {
if (current == null) {
return;
}
for (HRegionLocation loc : current.getRegionLocations()) {
if (loc != null) {
this.results.add(new Pair<>(loc.getRegionInfo(), loc.getServerName()));
}
}
}
};
scanMeta(connection,
getTableStartRowForMeta(tableName, QueryType.REGION),
getTableStopRowForMeta(tableName, QueryType.REGION),
QueryType.REGION, visitor);
return visitor.getResults();
}
/**
* @param connection connection we're using
* @param serverName server whose regions we're interested in
* @return List of user regions installed on this server (does not include
* catalog regions).
* @throws IOException
*/
public static NavigableMap<HRegionInfo, Result>
getServerUserRegions(Connection connection, final ServerName serverName)
throws IOException {
final NavigableMap<HRegionInfo, Result> hris = new TreeMap<>();
// Fill the above hris map with entries from hbase:meta that have the passed
// servername.
CollectingVisitor<Result> v = new CollectingVisitor<Result>() {
@Override
void add(Result r) {
if (r == null || r.isEmpty()) return;
RegionLocations locations = getRegionLocations(r);
if (locations == null) return;
for (HRegionLocation loc : locations.getRegionLocations()) {
if (loc != null) {
if (loc.getServerName() != null && loc.getServerName().equals(serverName)) {
hris.put(loc.getRegionInfo(), r);
}
}
}
}
};
scanMeta(connection, null, null, QueryType.REGION, v);
return hris;
}
public static void fullScanMetaAndPrint(Connection connection)
throws IOException {
Visitor v = new Visitor() {
@Override
public boolean visit(Result r) throws IOException {
if (r == null || r.isEmpty()) return true;
LOG.info("fullScanMetaAndPrint.Current Meta Row: " + r);
TableState state = getTableState(r);
if (state != null) {
LOG.info("Table State: " + state);
} else {
RegionLocations locations = getRegionLocations(r);
if (locations == null) return true;
for (HRegionLocation loc : locations.getRegionLocations()) {
if (loc != null) {
LOG.info("fullScanMetaAndPrint.HRI Print= " + loc.getRegionInfo());
}
}
}
return true;
}
};
scanMeta(connection, null, null, QueryType.ALL, v);
}
public static void scanMetaForTableRegions(Connection connection,
Visitor visitor, TableName tableName) throws IOException {
scanMeta(connection, tableName, QueryType.REGION, Integer.MAX_VALUE, visitor);
}
public static void scanMeta(Connection connection, TableName table,
QueryType type, int maxRows, final Visitor visitor) throws IOException {
scanMeta(connection, getTableStartRowForMeta(table, type), getTableStopRowForMeta(table, type),
type, maxRows, visitor);
}
public static void scanMeta(Connection connection,
@Nullable final byte[] startRow, @Nullable final byte[] stopRow,
QueryType type, final Visitor visitor) throws IOException {
scanMeta(connection, startRow, stopRow, type, Integer.MAX_VALUE, visitor);
}
/**
* Performs a scan of META table for given table starting from
* given row.
*
* @param connection connection we're using
* @param visitor visitor to call
* @param tableName table withing we scan
* @param row start scan from this row
* @param rowLimit max number of rows to return
* @throws IOException
*/
public static void scanMeta(Connection connection,
final Visitor visitor, final TableName tableName,
final byte[] row, final int rowLimit)
throws IOException {
byte[] startRow = null;
byte[] stopRow = null;
if (tableName != null) {
startRow =
getTableStartRowForMeta(tableName, QueryType.REGION);
if (row != null) {
HRegionInfo closestRi =
getClosestRegionInfo(connection, tableName, row);
startRow = HRegionInfo
.createRegionName(tableName, closestRi.getStartKey(), HConstants.ZEROES, false);
}
stopRow =
getTableStopRowForMeta(tableName, QueryType.REGION);
}
scanMeta(connection, startRow, stopRow, QueryType.REGION, rowLimit, visitor);
}
/**
* Performs a scan of META table.
* @param connection connection we're using
* @param startRow Where to start the scan. Pass null if want to begin scan
* at first row.
* @param stopRow Where to stop the scan. Pass null if want to scan all rows
* from the start one
* @param type scanned part of meta
* @param maxRows maximum rows to return
* @param visitor Visitor invoked against each row.
* @throws IOException
*/
public static void scanMeta(Connection connection,
@Nullable final byte[] startRow, @Nullable final byte[] stopRow,
QueryType type, int maxRows, final Visitor visitor)
throws IOException {
int rowUpperLimit = maxRows > 0 ? maxRows : Integer.MAX_VALUE;
Scan scan = getMetaScan(connection, rowUpperLimit);
for (byte[] family : type.getFamilies()) {
scan.addFamily(family);
}
if (startRow != null) scan.setStartRow(startRow);
if (stopRow != null) scan.setStopRow(stopRow);
if (LOG.isTraceEnabled()) {
LOG.trace("Scanning META"
+ " starting at row=" + Bytes.toStringBinary(startRow)
+ " stopping at row=" + Bytes.toStringBinary(stopRow)
+ " for max=" + rowUpperLimit
+ " with caching=" + scan.getCaching());
}
int currentRow = 0;
try (Table metaTable = getMetaHTable(connection)) {
try (ResultScanner scanner = metaTable.getScanner(scan)) {
Result data;
while ((data = scanner.next()) != null) {
if (data.isEmpty()) continue;
// Break if visit returns false.
if (!visitor.visit(data)) break;
if (++currentRow >= rowUpperLimit) break;
}
}
}
if (visitor != null && visitor instanceof Closeable) {
try {
((Closeable) visitor).close();
} catch (Throwable t) {
ExceptionUtil.rethrowIfInterrupt(t);
LOG.debug("Got exception in closing the meta scanner visitor", t);
}
}
}
/**
* @return Get closest metatable region row to passed <code>row</code>
* @throws java.io.IOException
*/
@NonNull
public static HRegionInfo getClosestRegionInfo(Connection connection,
@NonNull final TableName tableName,
@NonNull final byte[] row)
throws IOException {
byte[] searchRow = HRegionInfo.createRegionName(tableName, row, HConstants.NINES, false);
Scan scan = getMetaScan(connection, 1);
scan.setReversed(true);
scan.setStartRow(searchRow);
try (ResultScanner resultScanner = getMetaHTable(connection).getScanner(scan)) {
Result result = resultScanner.next();
if (result == null) {
throw new TableNotFoundException("Cannot find row in META " +
" for table: " + tableName + ", row=" + Bytes.toStringBinary(row));
}
HRegionInfo regionInfo = getHRegionInfo(result);
if (regionInfo == null) {
throw new IOException("HRegionInfo was null or empty in Meta for " +
tableName + ", row=" + Bytes.toStringBinary(row));
}
return regionInfo;
}
}
/**
* Returns the column family used for meta columns.
* @return HConstants.CATALOG_FAMILY.
*/
protected static byte[] getCatalogFamily() {
return HConstants.CATALOG_FAMILY;
}
/**
* Returns the column family used for table columns.
* @return HConstants.TABLE_FAMILY.
*/
protected static byte[] getTableFamily() {
return HConstants.TABLE_FAMILY;
}
/**
* Returns the column qualifier for serialized region info
* @return HConstants.REGIONINFO_QUALIFIER
*/
protected static byte[] getRegionInfoColumn() {
return HConstants.REGIONINFO_QUALIFIER;
}
/**
* Returns the column qualifier for serialized table state
*
* @return HConstants.TABLE_STATE_QUALIFIER
*/
protected static byte[] getStateColumn() {
return HConstants.TABLE_STATE_QUALIFIER;
}
/**
* Returns the column qualifier for server column for replicaId
* @param replicaId the replicaId of the region
* @return a byte[] for server column qualifier
*/
@VisibleForTesting
public static byte[] getServerColumn(int replicaId) {
return replicaId == 0
? HConstants.SERVER_QUALIFIER
: Bytes.toBytes(HConstants.SERVER_QUALIFIER_STR + META_REPLICA_ID_DELIMITER
+ String.format(HRegionInfo.REPLICA_ID_FORMAT, replicaId));
}
/**
* Returns the column qualifier for server start code column for replicaId
* @param replicaId the replicaId of the region
* @return a byte[] for server start code column qualifier
*/
@VisibleForTesting
public static byte[] getStartCodeColumn(int replicaId) {
return replicaId == 0
? HConstants.STARTCODE_QUALIFIER
: Bytes.toBytes(HConstants.STARTCODE_QUALIFIER_STR + META_REPLICA_ID_DELIMITER
+ String.format(HRegionInfo.REPLICA_ID_FORMAT, replicaId));
}
/**
* Returns the column qualifier for seqNum column for replicaId
* @param replicaId the replicaId of the region
* @return a byte[] for seqNum column qualifier
*/
@VisibleForTesting
public static byte[] getSeqNumColumn(int replicaId) {
return replicaId == 0
? HConstants.SEQNUM_QUALIFIER
: Bytes.toBytes(HConstants.SEQNUM_QUALIFIER_STR + META_REPLICA_ID_DELIMITER
+ String.format(HRegionInfo.REPLICA_ID_FORMAT, replicaId));
}
/**
* Parses the replicaId from the server column qualifier. See top of the class javadoc
* for the actual meta layout
* @param serverColumn the column qualifier
* @return an int for the replicaId
*/
@VisibleForTesting
static int parseReplicaIdFromServerColumn(byte[] serverColumn) {
String serverStr = Bytes.toString(serverColumn);
Matcher matcher = SERVER_COLUMN_PATTERN.matcher(serverStr);
if (matcher.matches() && matcher.groupCount() > 0) {
String group = matcher.group(1);
if (group != null && group.length() > 0) {
return Integer.parseInt(group.substring(1), 16);
} else {
return 0;
}
}
return -1;
}
/**
* Returns a {@link ServerName} from catalog table {@link Result}.
* @param r Result to pull from
* @return A ServerName instance or null if necessary fields not found or empty.
*/
@Nullable
@InterfaceAudience.Private // for use by HMaster#getTableRegionRow which is used for testing only
public static ServerName getServerName(final Result r, final int replicaId) {
byte[] serverColumn = getServerColumn(replicaId);
Cell cell = r.getColumnLatestCell(getCatalogFamily(), serverColumn);
if (cell == null || cell.getValueLength() == 0) return null;
String hostAndPort = Bytes.toString(
cell.getValueArray(), cell.getValueOffset(), cell.getValueLength());
byte[] startcodeColumn = getStartCodeColumn(replicaId);
cell = r.getColumnLatestCell(getCatalogFamily(), startcodeColumn);
if (cell == null || cell.getValueLength() == 0) return null;
try {
return ServerName.valueOf(hostAndPort,
Bytes.toLong(cell.getValueArray(), cell.getValueOffset(), cell.getValueLength()));
} catch (IllegalArgumentException e) {
LOG.error("Ignoring invalid region for server " + hostAndPort + "; cell=" + cell, e);
return null;
}
}
/**
* The latest seqnum that the server writing to meta observed when opening the region.
* E.g. the seqNum when the result of {@link #getServerName(Result, int)} was written.
* @param r Result to pull the seqNum from
* @return SeqNum, or HConstants.NO_SEQNUM if there's no value written.
*/
private static long getSeqNumDuringOpen(final Result r, final int replicaId) {
Cell cell = r.getColumnLatestCell(getCatalogFamily(), getSeqNumColumn(replicaId));
if (cell == null || cell.getValueLength() == 0) return HConstants.NO_SEQNUM;
return Bytes.toLong(cell.getValueArray(), cell.getValueOffset(), cell.getValueLength());
}
/**
* Returns an HRegionLocationList extracted from the result.
* @return an HRegionLocationList containing all locations for the region range or null if
* we can't deserialize the result.
*/
@Nullable
public static RegionLocations getRegionLocations(final Result r) {
if (r == null) return null;
HRegionInfo regionInfo = getHRegionInfo(r, getRegionInfoColumn());
if (regionInfo == null) return null;
List<HRegionLocation> locations = new ArrayList<>(1);
NavigableMap<byte[],NavigableMap<byte[],byte[]>> familyMap = r.getNoVersionMap();
locations.add(getRegionLocation(r, regionInfo, 0));
NavigableMap<byte[], byte[]> infoMap = familyMap.get(getCatalogFamily());
if (infoMap == null) return new RegionLocations(locations);
// iterate until all serverName columns are seen
int replicaId = 0;
byte[] serverColumn = getServerColumn(replicaId);
SortedMap<byte[], byte[]> serverMap = null;
serverMap = infoMap.tailMap(serverColumn, false);
if (serverMap.isEmpty()) return new RegionLocations(locations);
for (Map.Entry<byte[], byte[]> entry : serverMap.entrySet()) {
replicaId = parseReplicaIdFromServerColumn(entry.getKey());
if (replicaId < 0) {
break;
}
HRegionLocation location = getRegionLocation(r, regionInfo, replicaId);
// In case the region replica is newly created, it's location might be null. We usually do not
// have HRL's in RegionLocations object with null ServerName. They are handled as null HRLs.
if (location == null || location.getServerName() == null) {
locations.add(null);
} else {
locations.add(location);
}
}
return new RegionLocations(locations);
}
/**
* Returns the HRegionLocation parsed from the given meta row Result
* for the given regionInfo and replicaId. The regionInfo can be the default region info
* for the replica.
* @param r the meta row result
* @param regionInfo RegionInfo for default replica
* @param replicaId the replicaId for the HRegionLocation
* @return HRegionLocation parsed from the given meta row Result for the given replicaId
*/
private static HRegionLocation getRegionLocation(final Result r, final HRegionInfo regionInfo,
final int replicaId) {
ServerName serverName = getServerName(r, replicaId);
long seqNum = getSeqNumDuringOpen(r, replicaId);
HRegionInfo replicaInfo = RegionReplicaUtil.getRegionInfoForReplica(regionInfo, replicaId);
return new HRegionLocation(replicaInfo, serverName, seqNum);
}
/**
* Returns HRegionInfo object from the column
* HConstants.CATALOG_FAMILY:HConstants.REGIONINFO_QUALIFIER of the catalog
* table Result.
* @param data a Result object from the catalog table scan
* @return HRegionInfo or null
*/
public static HRegionInfo getHRegionInfo(Result data) {
return getHRegionInfo(data, HConstants.REGIONINFO_QUALIFIER);
}
/**
* Returns the HRegionInfo object from the column {@link HConstants#CATALOG_FAMILY} and
* <code>qualifier</code> of the catalog table result.
* @param r a Result object from the catalog table scan
* @param qualifier Column family qualifier
* @return An HRegionInfo instance or null.
*/
@Nullable
private static HRegionInfo getHRegionInfo(final Result r, byte [] qualifier) {
Cell cell = r.getColumnLatestCell(getCatalogFamily(), qualifier);
if (cell == null) return null;
return HRegionInfo.parseFromOrNull(cell.getValueArray(),
cell.getValueOffset(), cell.getValueLength());
}
/**
* Returns the daughter regions by reading the corresponding columns of the catalog table
* Result.
* @param data a Result object from the catalog table scan
* @return a pair of HRegionInfo or PairOfSameType(null, null) if the region is not a split
* parent
*/
public static PairOfSameType<HRegionInfo> getDaughterRegions(Result data) {
HRegionInfo splitA = getHRegionInfo(data, HConstants.SPLITA_QUALIFIER);
HRegionInfo splitB = getHRegionInfo(data, HConstants.SPLITB_QUALIFIER);
return new PairOfSameType<>(splitA, splitB);
}
/**
* Returns the merge regions by reading the corresponding columns of the catalog table
* Result.
* @param data a Result object from the catalog table scan
* @return a pair of HRegionInfo or PairOfSameType(null, null) if the region is not a split
* parent
*/
public static PairOfSameType<HRegionInfo> getMergeRegions(Result data) {
HRegionInfo mergeA = getHRegionInfo(data, HConstants.MERGEA_QUALIFIER);
HRegionInfo mergeB = getHRegionInfo(data, HConstants.MERGEB_QUALIFIER);
return new PairOfSameType<>(mergeA, mergeB);
}
/**
* Fetch table state for given table from META table
* @param conn connection to use
* @param tableName table to fetch state for
* @return state
* @throws IOException
*/
@Nullable
public static TableState getTableState(Connection conn, TableName tableName)
throws IOException {
Table metaHTable = getMetaHTable(conn);
Get get = new Get(tableName.getName()).addColumn(getTableFamily(), getStateColumn());
long time = EnvironmentEdgeManager.currentTime();
get.setTimeRange(0, time);
Result result =
metaHTable.get(get);
return getTableState(result);
}
/**
* Fetch table states from META table
* @param conn connection to use
* @return map {tableName -> state}
* @throws IOException
*/
public static Map<TableName, TableState> getTableStates(Connection conn)
throws IOException {
final Map<TableName, TableState> states = new LinkedHashMap<>();
Visitor collector = new Visitor() {
@Override
public boolean visit(Result r) throws IOException {
TableState state = getTableState(r);
if (state != null)
states.put(state.getTableName(), state);
return true;
}
};
fullScanTables(conn, collector);
return states;
}
/**
* Updates state in META
* @param conn connection to use
* @param tableName table to look for
* @throws IOException
*/
public static void updateTableState(Connection conn, TableName tableName,
TableState.State actual) throws IOException {
updateTableState(conn, new TableState(tableName, actual));
}
/**
* Decode table state from META Result.
* Should contain cell from HConstants.TABLE_FAMILY
* @param r result
* @return null if not found
* @throws IOException
*/
@Nullable
public static TableState getTableState(Result r)
throws IOException {
Cell cell = r.getColumnLatestCell(getTableFamily(), getStateColumn());
if (cell == null) return null;
try {
return TableState.parseFrom(TableName.valueOf(r.getRow()),
Arrays.copyOfRange(cell.getValueArray(),
cell.getValueOffset(), cell.getValueOffset() + cell.getValueLength()));
} catch (DeserializationException e) {
throw new IOException(e);
}
}
/**
* Implementations 'visit' a catalog table row.
*/
public interface Visitor {
/**
* Visit the catalog table row.
* @param r A row from catalog table
* @return True if we are to proceed scanning the table, else false if
* we are to stop now.
*/
boolean visit(final Result r) throws IOException;
}
/**
* Implementations 'visit' a catalog table row but with close() at the end.
*/
public interface CloseableVisitor extends Visitor, Closeable {
}
/**
* A {@link Visitor} that collects content out of passed {@link Result}.
*/
static abstract class CollectingVisitor<T> implements Visitor {
final List<T> results = new ArrayList<>();
@Override
public boolean visit(Result r) throws IOException {
if (r == null || r.isEmpty()) return true;
add(r);
return true;
}
abstract void add(Result r);
/**
* @return Collected results; wait till visits complete to collect all
* possible results
*/
List<T> getResults() {
return this.results;
}
}
/**
* Collects all returned.
*/
static class CollectAllVisitor extends CollectingVisitor<Result> {
@Override
void add(Result r) {
this.results.add(r);
}
}
/**
* A Visitor that skips offline regions and split parents
*/
public static abstract class DefaultVisitorBase implements Visitor {
public DefaultVisitorBase() {
super();
}
public abstract boolean visitInternal(Result rowResult) throws IOException;
@Override
public boolean visit(Result rowResult) throws IOException {
HRegionInfo info = getHRegionInfo(rowResult);
if (info == null) {
return true;
}
//skip over offline and split regions
if (!(info.isOffline() || info.isSplit())) {
return visitInternal(rowResult);
}
return true;
}
}
/**
* A Visitor for a table. Provides a consistent view of the table's
* hbase:meta entries during concurrent splits (see HBASE-5986 for details). This class
* does not guarantee ordered traversal of meta entries, and can block until the
* hbase:meta entries for daughters are available during splits.
*/
public static abstract class TableVisitorBase extends DefaultVisitorBase {
private TableName tableName;
public TableVisitorBase(TableName tableName) {
super();
this.tableName = tableName;
}
@Override
public final boolean visit(Result rowResult) throws IOException {
HRegionInfo info = getHRegionInfo(rowResult);
if (info == null) {
return true;
}
if (!(info.getTable().equals(tableName))) {
return false;
}
return super.visit(rowResult);
}
}
/**
* Count regions in <code>hbase:meta</code> for passed table.
* @param c Configuration object
* @param tableName table name to count regions for
* @return Count or regions in table <code>tableName</code>
* @throws IOException
*/
public static int getRegionCount(final Configuration c, final TableName tableName)
throws IOException {
try (Connection connection = ConnectionFactory.createConnection(c)) {
return getRegionCount(connection, tableName);
}
}
/**
* Count regions in <code>hbase:meta</code> for passed table.
* @param connection Connection object
* @param tableName table name to count regions for
* @return Count or regions in table <code>tableName</code>
* @throws IOException
*/
public static int getRegionCount(final Connection connection, final TableName tableName)
throws IOException {
try (RegionLocator locator = connection.getRegionLocator(tableName)) {
List<HRegionLocation> locations = locator.getAllRegionLocations();
return locations == null? 0: locations.size();
}
}
////////////////////////
// Editing operations //
////////////////////////
/**
* Generates and returns a Put containing the region into for the catalog table
*/
public static Put makePutFromRegionInfo(HRegionInfo regionInfo)
throws IOException {
return makePutFromRegionInfo(regionInfo, EnvironmentEdgeManager.currentTime());
}
/**
* Generates and returns a Put containing the region into for the catalog table
*/
public static Put makePutFromRegionInfo(HRegionInfo regionInfo, long ts)
throws IOException {
Put put = new Put(regionInfo.getRegionName(), ts);
addRegionInfo(put, regionInfo);
return put;
}
/**
* Generates and returns a Delete containing the region info for the catalog
* table
*/
public static Delete makeDeleteFromRegionInfo(HRegionInfo regionInfo) {
long now = EnvironmentEdgeManager.currentTime();
return makeDeleteFromRegionInfo(regionInfo, now);
}
/**
* Generates and returns a Delete containing the region info for the catalog
* table
*/
public static Delete makeDeleteFromRegionInfo(HRegionInfo regionInfo, long ts) {
if (regionInfo == null) {
throw new IllegalArgumentException("Can't make a delete for null region");
}
Delete delete = new Delete(regionInfo.getRegionName());
delete.addFamily(getCatalogFamily(), ts);
return delete;
}
public static Put makeBarrierPut(byte[] encodedRegionName, long seq, byte[] tableName) {
byte[] seqBytes = Bytes.toBytes(seq);
return new Put(encodedRegionName)
.addImmutable(HConstants.REPLICATION_BARRIER_FAMILY, seqBytes, seqBytes)
.addImmutable(HConstants.REPLICATION_META_FAMILY, tableNameCq, tableName);
}
public static Put makeDaughterPut(byte[] encodedRegionName, byte[] value) {
return new Put(encodedRegionName).addImmutable(HConstants.REPLICATION_META_FAMILY,
daughterNameCq, value);
}
public static Put makeParentPut(byte[] encodedRegionName, byte[] value) {
return new Put(encodedRegionName).addImmutable(HConstants.REPLICATION_META_FAMILY,
parentNameCq, value);
}
/**
* Adds split daughters to the Put
*/
public static Put addDaughtersToPut(Put put, HRegionInfo splitA, HRegionInfo splitB) {
if (splitA != null) {
put.addImmutable(
HConstants.CATALOG_FAMILY, HConstants.SPLITA_QUALIFIER, splitA.toByteArray());
}
if (splitB != null) {
put.addImmutable(
HConstants.CATALOG_FAMILY, HConstants.SPLITB_QUALIFIER, splitB.toByteArray());
}
return put;
}
/**
* Put the passed <code>puts</code> to the <code>hbase:meta</code> table.
* Non-atomic for multi puts.
* @param connection connection we're using
* @param puts Put to add to hbase:meta
* @throws IOException
*/
public static void putToMetaTable(final Connection connection, final Put... puts)
throws IOException {
put(getMetaHTable(connection), Arrays.asList(puts));
}
/**
* @param t Table to use (will be closed when done).
* @param puts puts to make
* @throws IOException
*/
private static void put(final Table t, final List<Put> puts) throws IOException {
try {
if (METALOG.isDebugEnabled()) {
METALOG.debug(mutationsToString(puts));
}
t.put(puts);
} finally {
t.close();
}
}
/**
* Put the passed <code>ps</code> to the <code>hbase:meta</code> table.
* @param connection connection we're using
* @param ps Put to add to hbase:meta
* @throws IOException
*/
public static void putsToMetaTable(final Connection connection, final List<Put> ps)
throws IOException {
Table t = getMetaHTable(connection);
try {
if (METALOG.isDebugEnabled()) {
METALOG.debug(mutationsToString(ps));
}
t.put(ps);
} finally {
t.close();
}
}
/**
* Delete the passed <code>d</code> from the <code>hbase:meta</code> table.
* @param connection connection we're using
* @param d Delete to add to hbase:meta
* @throws IOException
*/
static void deleteFromMetaTable(final Connection connection, final Delete d)
throws IOException {
List<Delete> dels = new ArrayList<>(1);
dels.add(d);
deleteFromMetaTable(connection, dels);
}
/**
* Delete the passed <code>deletes</code> from the <code>hbase:meta</code> table.
* @param connection connection we're using
* @param deletes Deletes to add to hbase:meta This list should support #remove.
* @throws IOException
*/
public static void deleteFromMetaTable(final Connection connection, final List<Delete> deletes)
throws IOException {
Table t = getMetaHTable(connection);
try {
if (METALOG.isDebugEnabled()) {
METALOG.debug(mutationsToString(deletes));
}
t.delete(deletes);
} finally {
t.close();
}
}
/**
* Deletes some replica columns corresponding to replicas for the passed rows
* @param metaRows rows in hbase:meta
* @param replicaIndexToDeleteFrom the replica ID we would start deleting from
* @param numReplicasToRemove how many replicas to remove
* @param connection connection we're using to access meta table
* @throws IOException
*/
public static void removeRegionReplicasFromMeta(Set<byte[]> metaRows,
int replicaIndexToDeleteFrom, int numReplicasToRemove, Connection connection)
throws IOException {
int absoluteIndex = replicaIndexToDeleteFrom + numReplicasToRemove;
for (byte[] row : metaRows) {
long now = EnvironmentEdgeManager.currentTime();
Delete deleteReplicaLocations = new Delete(row);
for (int i = replicaIndexToDeleteFrom; i < absoluteIndex; i++) {
deleteReplicaLocations.addColumns(getCatalogFamily(),
getServerColumn(i), now);
deleteReplicaLocations.addColumns(getCatalogFamily(),
getSeqNumColumn(i), now);
deleteReplicaLocations.addColumns(getCatalogFamily(),
getStartCodeColumn(i), now);
}
deleteFromMetaTable(connection, deleteReplicaLocations);
}
}
/**
* Execute the passed <code>mutations</code> against <code>hbase:meta</code> table.
* @param connection connection we're using
* @param mutations Puts and Deletes to execute on hbase:meta
* @throws IOException
*/
public static void mutateMetaTable(final Connection connection,
final List<Mutation> mutations)
throws IOException {
Table t = getMetaHTable(connection);
try {
if (METALOG.isDebugEnabled()) {
METALOG.debug(mutationsToString(mutations));
}
t.batch(mutations, null);
} catch (InterruptedException e) {
InterruptedIOException ie = new InterruptedIOException(e.getMessage());
ie.initCause(e);
throw ie;
} finally {
t.close();
}
}
/**
* Adds a hbase:meta row for the specified new region.
* @param connection connection we're using
* @param regionInfo region information
* @throws IOException if problem connecting or updating meta
*/
public static void addRegionToMeta(Connection connection,
HRegionInfo regionInfo)
throws IOException {
putToMetaTable(connection, makePutFromRegionInfo(regionInfo));
LOG.info("Added " + regionInfo.getRegionNameAsString());
}
/**
* Adds a hbase:meta row for the specified new region to the given catalog table. The
* Table is not flushed or closed.
* @param meta the Table for META
* @param regionInfo region information
* @throws IOException if problem connecting or updating meta
*/
public static void addRegionToMeta(Table meta, HRegionInfo regionInfo) throws IOException {
addRegionToMeta(meta, regionInfo, null, null);
}
/**
* Adds a (single) hbase:meta row for the specified new region and its daughters. Note that this
* does not add its daughter's as different rows, but adds information about the daughters
* in the same row as the parent. Use
* {@link #splitRegion(Connection, HRegionInfo, HRegionInfo, HRegionInfo, ServerName,int,boolean)}
* if you want to do that.
* @param meta the Table for META
* @param regionInfo region information
* @param splitA first split daughter of the parent regionInfo
* @param splitB second split daughter of the parent regionInfo
* @throws IOException if problem connecting or updating meta
*/
public static void addRegionToMeta(Table meta, HRegionInfo regionInfo,
HRegionInfo splitA, HRegionInfo splitB) throws IOException {
Put put = makePutFromRegionInfo(regionInfo);
addDaughtersToPut(put, splitA, splitB);
meta.put(put);
if (METALOG.isDebugEnabled()) {
METALOG.debug(mutationToString(put));
}
if (LOG.isDebugEnabled()) {
LOG.debug("Added " + regionInfo.getRegionNameAsString());
}
}
/**
* Adds a (single) hbase:meta row for the specified new region and its daughters. Note that this
* does not add its daughter's as different rows, but adds information about the daughters
* in the same row as the parent. Use
* {@link #splitRegion(Connection, HRegionInfo, HRegionInfo, HRegionInfo, ServerName,int,boolean)}
* if you want to do that.
* @param connection connection we're using
* @param regionInfo region information
* @param splitA first split daughter of the parent regionInfo
* @param splitB second split daughter of the parent regionInfo
* @throws IOException if problem connecting or updating meta
*/
public static void addRegionToMeta(Connection connection, HRegionInfo regionInfo,
HRegionInfo splitA, HRegionInfo splitB) throws IOException {
Table meta = getMetaHTable(connection);
try {
addRegionToMeta(meta, regionInfo, splitA, splitB);
} finally {
meta.close();
}
}
/**
* Adds a hbase:meta row for each of the specified new regions.
* @param connection connection we're using
* @param regionInfos region information list
* @throws IOException if problem connecting or updating meta
*/
public static void addRegionsToMeta(Connection connection,
List<HRegionInfo> regionInfos, int regionReplication)
throws IOException {
addRegionsToMeta(connection, regionInfos, regionReplication, HConstants.LATEST_TIMESTAMP);
}
/**
* Adds a hbase:meta row for each of the specified new regions.
* @param connection connection we're using
* @param regionInfos region information list
* @param regionReplication
* @param ts desired timestamp
* @throws IOException if problem connecting or updating meta
*/
public static void addRegionsToMeta(Connection connection,
List<HRegionInfo> regionInfos, int regionReplication, long ts)
throws IOException {
List<Put> puts = new ArrayList<>();
for (HRegionInfo regionInfo : regionInfos) {
if (RegionReplicaUtil.isDefaultReplica(regionInfo)) {
Put put = makePutFromRegionInfo(regionInfo, ts);
// Add empty locations for region replicas so that number of replicas can be cached
// whenever the primary region is looked up from meta
for (int i = 1; i < regionReplication; i++) {
addEmptyLocation(put, i);
}
puts.add(put);
}
}
putsToMetaTable(connection, puts);
LOG.info("Added " + puts.size());
}
/**
* Adds a daughter region entry to meta.
* @param regionInfo the region to put
* @param sn the location of the region
* @param openSeqNum the latest sequence number obtained when the region was open
*/
public static void addDaughter(final Connection connection,
final HRegionInfo regionInfo, final ServerName sn, final long openSeqNum)
throws NotAllMetaRegionsOnlineException, IOException {
long now = EnvironmentEdgeManager.currentTime();
Put put = new Put(regionInfo.getRegionName(), now);
addRegionInfo(put, regionInfo);
if (sn != null) {
addLocation(put, sn, openSeqNum, -1, regionInfo.getReplicaId());
}
putToMetaTable(connection, put);
LOG.info("Added daughter " + regionInfo.getEncodedName() +
(sn == null? ", serverName=null": ", serverName=" + sn.toString()));
}
/**
* Merge the two regions into one in an atomic operation. Deletes the two
* merging regions in hbase:meta and adds the merged region with the information of
* two merging regions.
* @param connection connection we're using
* @param mergedRegion the merged region
* @param regionA
* @param regionB
* @param sn the location of the region
* @param masterSystemTime
* @param saveBarrier true if need save replication barrier in meta, used for serial replication
* @throws IOException
*/
public static void mergeRegions(final Connection connection, HRegionInfo mergedRegion,
HRegionInfo regionA, HRegionInfo regionB, ServerName sn, int regionReplication,
long masterSystemTime, boolean saveBarrier)
throws IOException {
Table meta = getMetaHTable(connection);
try {
HRegionInfo copyOfMerged = new HRegionInfo(mergedRegion);
// use the maximum of what master passed us vs local time.
long time = Math.max(EnvironmentEdgeManager.currentTime(), masterSystemTime);
// Put for parent
Put putOfMerged = makePutFromRegionInfo(copyOfMerged, time);
putOfMerged.addImmutable(HConstants.CATALOG_FAMILY, HConstants.MERGEA_QUALIFIER,
regionA.toByteArray());
putOfMerged.addImmutable(HConstants.CATALOG_FAMILY, HConstants.MERGEB_QUALIFIER,
regionB.toByteArray());
// Deletes for merging regions
Delete deleteA = makeDeleteFromRegionInfo(regionA, time);
Delete deleteB = makeDeleteFromRegionInfo(regionB, time);
// The merged is a new region, openSeqNum = 1 is fine.
addLocation(putOfMerged, sn, 1, -1, mergedRegion.getReplicaId());
// Add empty locations for region replicas of the merged region so that number of replicas can
// be cached whenever the primary region is looked up from meta
for (int i = 1; i < regionReplication; i++) {
addEmptyLocation(putOfMerged, i);
}
byte[] tableRow = Bytes.toBytes(mergedRegion.getRegionNameAsString()
+ HConstants.DELIMITER);
Mutation[] mutations;
if (saveBarrier) {
Put putBarrierA = makeDaughterPut(regionA.getEncodedNameAsBytes(),
mergedRegion.getEncodedNameAsBytes());
Put putBarrierB = makeDaughterPut(regionB.getEncodedNameAsBytes(),
mergedRegion.getEncodedNameAsBytes());
Put putDaughter = makeParentPut(mergedRegion.getEncodedNameAsBytes(), Bytes.toBytes(
regionA.getEncodedName() + "," + regionB.getEncodedName()));
mutations = new Mutation[] { putOfMerged, deleteA, deleteB,
putBarrierA, putBarrierB, putDaughter};
} else {
mutations = new Mutation[] { putOfMerged, deleteA, deleteB };
}
multiMutate(connection, meta, tableRow, mutations);
} finally {
meta.close();
}
}
/**
* Splits the region into two in an atomic operation. Offlines the parent
* region with the information that it is split into two, and also adds
* the daughter regions. Does not add the location information to the daughter
* regions since they are not open yet.
* @param connection connection we're using
* @param parent the parent region which is split
* @param splitA Split daughter region A
* @param splitB Split daughter region A
* @param sn the location of the region
* @param saveBarrier true if need save replication barrier in meta, used for serial replication
*/
public static void splitRegion(final Connection connection, HRegionInfo parent,
HRegionInfo splitA, HRegionInfo splitB, ServerName sn, int regionReplication,
boolean saveBarrier) throws IOException {
Table meta = getMetaHTable(connection);
try {
HRegionInfo copyOfParent = new HRegionInfo(parent);
copyOfParent.setOffline(true);
copyOfParent.setSplit(true);
//Put for parent
Put putParent = makePutFromRegionInfo(copyOfParent);
addDaughtersToPut(putParent, splitA, splitB);
//Puts for daughters
Put putA = makePutFromRegionInfo(splitA);
Put putB = makePutFromRegionInfo(splitB);
addLocation(putA, sn, 1, -1, splitA.getReplicaId()); //new regions, openSeqNum = 1 is fine.
addLocation(putB, sn, 1, -1, splitB.getReplicaId());
// Add empty locations for region replicas of daughters so that number of replicas can be
// cached whenever the primary region is looked up from meta
for (int i = 1; i < regionReplication; i++) {
addEmptyLocation(putA, i);
addEmptyLocation(putB, i);
}
Mutation[] mutations;
if (saveBarrier) {
Put parentPut = makeDaughterPut(parent.getEncodedNameAsBytes(),
Bytes.toBytes(splitA.getEncodedName() + "," + splitB.getEncodedName()));
Put daughterPutA = makeParentPut(splitA.getEncodedNameAsBytes(),
parent.getEncodedNameAsBytes());
Put daughterPutB = makeParentPut(splitB.getEncodedNameAsBytes(),
parent.getEncodedNameAsBytes());
mutations = new Mutation[]{putParent, putA, putB, parentPut, daughterPutA, daughterPutB};
} else {
mutations = new Mutation[]{putParent, putA, putB};
}
byte[] tableRow = Bytes.toBytes(parent.getRegionNameAsString() + HConstants.DELIMITER);
multiMutate(connection, meta, tableRow, mutations);
} finally {
meta.close();
}
}
/**
* Update state of the table in meta.
* @param connection what we use for update
* @param state new state
* @throws IOException
*/
public static void updateTableState(Connection connection, TableState state)
throws IOException {
Put put = makePutFromTableState(state);
putToMetaTable(connection, put);
LOG.info(
"Updated table " + state.getTableName() + " state to " + state.getState() + " in META");
}
/**
* Construct PUT for given state
* @param state new state
*/
public static Put makePutFromTableState(TableState state) {
long time = EnvironmentEdgeManager.currentTime();
Put put = new Put(state.getTableName().getName(), time);
put.addColumn(getTableFamily(), getStateColumn(), state.convert().toByteArray());
return put;
}
/**
* Remove state for table from meta
* @param connection to use for deletion
* @param table to delete state for
*/
public static void deleteTableState(Connection connection, TableName table)
throws IOException {
long time = EnvironmentEdgeManager.currentTime();
Delete delete = new Delete(table.getName());
delete.addColumns(getTableFamily(), getStateColumn(), time);
deleteFromMetaTable(connection, delete);
LOG.info("Deleted table " + table + " state from META");
}
private static void multiMutate(Connection connection, Table table, byte[] row,
Mutation... mutations)
throws IOException {
multiMutate(connection, table, row, Arrays.asList(mutations));
}
/**
* Performs an atomic multi-mutate operation against the given table.
*/
// Used by the RSGroup Coprocessor Endpoint. It had a copy/paste of the below. Need to reveal
// this facility for CPEP use or at least those CPEPs that are on their way to becoming part of
// core as is the intent for RSGroup eventually.
public static void multiMutate(Connection connection, final Table table, byte[] row,
final List<Mutation> mutations)
throws IOException {
if (METALOG.isDebugEnabled()) {
METALOG.debug(mutationsToString(mutations));
}
// TODO: Need rollback!!!!
// TODO: Need Retry!!!
// TODO: What for a timeout? Default write timeout? GET FROM HTABLE?
// TODO: Review when we come through with ProcedureV2.
RegionServerCallable<MutateRowsResponse,
MultiRowMutationProtos.MultiRowMutationService.BlockingInterface> callable =
new RegionServerCallable<MutateRowsResponse,
MultiRowMutationProtos.MultiRowMutationService.BlockingInterface>(
connection, table.getName(), row, null/*RpcController not used in this CPEP!*/) {
@Override
protected MutateRowsResponse rpcCall() throws Exception {
final MutateRowsRequest.Builder builder = MutateRowsRequest.newBuilder();
for (Mutation mutation : mutations) {
if (mutation instanceof Put) {
builder.addMutationRequest(ProtobufUtil.toMutation(
ClientProtos.MutationProto.MutationType.PUT, mutation));
} else if (mutation instanceof Delete) {
builder.addMutationRequest(ProtobufUtil.toMutation(
ClientProtos.MutationProto.MutationType.DELETE, mutation));
} else {
throw new DoNotRetryIOException("multi in MetaEditor doesn't support "
+ mutation.getClass().getName());
}
}
// The call to #prepare that ran before this invocation will have populated HRegionLocation.
HRegionLocation hrl = getLocation();
RegionSpecifier region = ProtobufUtil.buildRegionSpecifier(
RegionSpecifierType.REGION_NAME, hrl.getRegionInfo().getRegionName());
builder.setRegion(region);
// The rpcController here is awkward. The Coprocessor Endpoint wants an instance of a
// com.google.protobuf but we are going over an rpc that is all shaded protobuf so it
// wants a org.apache.h.h.shaded.com.google.protobuf.RpcController. Set up a factory
// that makes com.google.protobuf.RpcController and then copy into it configs.
return getStub().mutateRows(null, builder.build());
}
@Override
// Called on the end of the super.prepare call. Set the stub.
protected void setStubByServiceName(ServerName serviceName/*Ignored*/) throws IOException {
CoprocessorRpcChannel channel = table.coprocessorService(getRow());
setStub(MultiRowMutationProtos.MultiRowMutationService.newBlockingStub(channel));
}
};
int writeTimeout = connection.getConfiguration().getInt(HConstants.HBASE_RPC_WRITE_TIMEOUT_KEY,
connection.getConfiguration().getInt(HConstants.HBASE_RPC_TIMEOUT_KEY,
HConstants.DEFAULT_HBASE_RPC_TIMEOUT));
// The region location should be cached in connection. Call prepare so this callable picks
// up the region location (see super.prepare method).
callable.prepare(false);
callable.call(writeTimeout);
}
/**
* Updates the location of the specified region in hbase:meta to be the specified
* server hostname and startcode.
* <p>
* Uses passed catalog tracker to get a connection to the server hosting
* hbase:meta and makes edits to that region.
*
* @param connection connection we're using
* @param regionInfo region to update location of
* @param openSeqNum the latest sequence number obtained when the region was open
* @param sn Server name
* @param masterSystemTime wall clock time from master if passed in the open region RPC or -1
* @throws IOException
*/
public static void updateRegionLocation(Connection connection,
HRegionInfo regionInfo, ServerName sn, long openSeqNum,
long masterSystemTime)
throws IOException {
updateLocation(connection, regionInfo, sn, openSeqNum, masterSystemTime);
}
/**
* Updates the progress of pushing entries to peer cluster. Skip entry if value is -1.
* @param connection connection we're using
* @param peerId the peerId to push
* @param positions map that saving positions for each region
* @throws IOException
*/
public static void updateReplicationPositions(Connection connection, String peerId,
Map<String, Long> positions) throws IOException {
List<Put> puts = new ArrayList<>(positions.entrySet().size());
for (Map.Entry<String, Long> entry : positions.entrySet()) {
long value = Math.abs(entry.getValue());
Put put = new Put(Bytes.toBytes(entry.getKey()));
put.addImmutable(HConstants.REPLICATION_POSITION_FAMILY, Bytes.toBytes(peerId),
Bytes.toBytes(value));
puts.add(put);
}
getMetaHTable(connection).put(puts);
}
/**
* Updates the location of the specified region to be the specified server.
* <p>
* Connects to the specified server which should be hosting the specified
* catalog region name to perform the edit.
*
* @param connection connection we're using
* @param regionInfo region to update location of
* @param sn Server name
* @param openSeqNum the latest sequence number obtained when the region was open
* @param masterSystemTime wall clock time from master if passed in the open region RPC or -1
* @throws IOException In particular could throw {@link java.net.ConnectException}
* if the server is down on other end.
*/
private static void updateLocation(final Connection connection,
HRegionInfo regionInfo, ServerName sn, long openSeqNum,
long masterSystemTime)
throws IOException {
// use the maximum of what master passed us vs local time.
long time = Math.max(EnvironmentEdgeManager.currentTime(), masterSystemTime);
// region replicas are kept in the primary region's row
Put put = new Put(getMetaKeyForRegion(regionInfo), time);
addRegionInfo(put, regionInfo);
addLocation(put, sn, openSeqNum, time, regionInfo.getReplicaId());
putToMetaTable(connection, put);
LOG.info("Updated row " + regionInfo.getRegionNameAsString() +
" with server=" + sn);
}
/**
* Deletes the specified region from META.
* @param connection connection we're using
* @param regionInfo region to be deleted from META
* @throws IOException
*/
public static void deleteRegion(Connection connection,
HRegionInfo regionInfo)
throws IOException {
long time = EnvironmentEdgeManager.currentTime();
Delete delete = new Delete(regionInfo.getRegionName());
delete.addFamily(getCatalogFamily(), time);
deleteFromMetaTable(connection, delete);
LOG.info("Deleted " + regionInfo.getRegionNameAsString());
}
/**
* Deletes the specified regions from META.
* @param connection connection we're using
* @param regionsInfo list of regions to be deleted from META
* @throws IOException
*/
public static void deleteRegions(Connection connection,
List<HRegionInfo> regionsInfo) throws IOException {
deleteRegions(connection, regionsInfo, EnvironmentEdgeManager.currentTime());
}
/**
* Deletes the specified regions from META.
* @param connection connection we're using
* @param regionsInfo list of regions to be deleted from META
* @throws IOException
*/
public static void deleteRegions(Connection connection,
List<HRegionInfo> regionsInfo, long ts) throws IOException {
List<Delete> deletes = new ArrayList<>(regionsInfo.size());
for (HRegionInfo hri: regionsInfo) {
Delete e = new Delete(hri.getRegionName());
e.addFamily(getCatalogFamily(), ts);
deletes.add(e);
}
deleteFromMetaTable(connection, deletes);
LOG.info("Deleted " + regionsInfo);
}
/**
* Adds and Removes the specified regions from hbase:meta
* @param connection connection we're using
* @param regionsToRemove list of regions to be deleted from META
* @param regionsToAdd list of regions to be added to META
* @throws IOException
*/
public static void mutateRegions(Connection connection,
final List<HRegionInfo> regionsToRemove,
final List<HRegionInfo> regionsToAdd)
throws IOException {
List<Mutation> mutation = new ArrayList<>();
if (regionsToRemove != null) {
for (HRegionInfo hri: regionsToRemove) {
mutation.add(makeDeleteFromRegionInfo(hri));
}
}
if (regionsToAdd != null) {
for (HRegionInfo hri: regionsToAdd) {
mutation.add(makePutFromRegionInfo(hri));
}
}
mutateMetaTable(connection, mutation);
if (regionsToRemove != null && regionsToRemove.size() > 0) {
LOG.debug("Deleted " + regionsToRemove);
}
if (regionsToAdd != null && regionsToAdd.size() > 0) {
LOG.debug("Added " + regionsToAdd);
}
}
/**
* Overwrites the specified regions from hbase:meta
* @param connection connection we're using
* @param regionInfos list of regions to be added to META
* @throws IOException
*/
public static void overwriteRegions(Connection connection,
List<HRegionInfo> regionInfos, int regionReplication) throws IOException {
// use master time for delete marker and the Put
long now = EnvironmentEdgeManager.currentTime();
deleteRegions(connection, regionInfos, now);
// Why sleep? This is the easiest way to ensure that the previous deletes does not
// eclipse the following puts, that might happen in the same ts from the server.
// See HBASE-9906, and HBASE-9879. Once either HBASE-9879, HBASE-8770 is fixed,
// or HBASE-9905 is fixed and meta uses seqIds, we do not need the sleep.
//
// HBASE-13875 uses master timestamp for the mutations. The 20ms sleep is not needed
addRegionsToMeta(connection, regionInfos, regionReplication, now+1);
LOG.info("Overwritten " + regionInfos);
}
/**
* Deletes merge qualifiers for the specified merged region.
* @param connection connection we're using
* @param mergedRegion
* @throws IOException
*/
public static void deleteMergeQualifiers(Connection connection,
final HRegionInfo mergedRegion) throws IOException {
long time = EnvironmentEdgeManager.currentTime();
Delete delete = new Delete(mergedRegion.getRegionName());
delete.addColumns(getCatalogFamily(), HConstants.MERGEA_QUALIFIER, time);
delete.addColumns(getCatalogFamily(), HConstants.MERGEB_QUALIFIER, time);
deleteFromMetaTable(connection, delete);
LOG.info("Deleted references in merged region "
+ mergedRegion.getRegionNameAsString() + ", qualifier="
+ Bytes.toStringBinary(HConstants.MERGEA_QUALIFIER) + " and qualifier="
+ Bytes.toStringBinary(HConstants.MERGEB_QUALIFIER));
}
public static Put addRegionInfo(final Put p, final HRegionInfo hri)
throws IOException {
p.addImmutable(getCatalogFamily(), HConstants.REGIONINFO_QUALIFIER,
hri.toByteArray());
return p;
}
public static Put addLocation(final Put p, final ServerName sn, long openSeqNum,
long time, int replicaId){
if (time <= 0) {
time = EnvironmentEdgeManager.currentTime();
}
p.addImmutable(getCatalogFamily(), getServerColumn(replicaId), time,
Bytes.toBytes(sn.getHostAndPort()));
p.addImmutable(getCatalogFamily(), getStartCodeColumn(replicaId), time,
Bytes.toBytes(sn.getStartcode()));
p.addImmutable(getCatalogFamily(), getSeqNumColumn(replicaId), time,
Bytes.toBytes(openSeqNum));
return p;
}
public static Put addEmptyLocation(final Put p, int replicaId) {
long now = EnvironmentEdgeManager.currentTime();
p.addImmutable(getCatalogFamily(), getServerColumn(replicaId), now, null);
p.addImmutable(getCatalogFamily(), getStartCodeColumn(replicaId), now, null);
p.addImmutable(getCatalogFamily(), getSeqNumColumn(replicaId), now, null);
return p;
}
private static String mutationsToString(List<? extends Mutation> mutations) throws IOException {
StringBuilder sb = new StringBuilder();
String prefix = "";
for (Mutation mutation : mutations) {
sb.append(prefix).append(mutationToString(mutation));
prefix = ", ";
}
return sb.toString();
}
private static String mutationToString(Mutation p) throws IOException {
return p.getClass().getSimpleName() + p.toJSON();
}
/**
* Get replication position for a peer in a region.
* @param connection connection we're using
* @return the position of this peer, -1 if no position in meta.
*/
public static long getReplicationPositionForOnePeer(Connection connection,
byte[] encodedRegionName, String peerId) throws IOException {
Get get = new Get(encodedRegionName);
get.addColumn(HConstants.REPLICATION_POSITION_FAMILY, Bytes.toBytes(peerId));
Result r = get(getMetaHTable(connection), get);
if (r.isEmpty()) {
return -1;
}
Cell cell = r.rawCells()[0];
return Bytes.toLong(cell.getValueArray(),cell.getValueOffset(),cell.getValueLength());
}
/**
* Get replication positions for all peers in a region.
* @param connection connection we're using
* @param encodedRegionName region's encoded name
* @return the map of positions for each peer
*/
public static Map<String, Long> getReplicationPositionForAllPeer(Connection connection,
byte[] encodedRegionName) throws IOException {
Get get = new Get(encodedRegionName);
get.addFamily(HConstants.REPLICATION_POSITION_FAMILY);
Result r = get(getMetaHTable(connection), get);
Map<String, Long> map = new HashMap<>((int) (r.size() / 0.75 + 1));
for (Cell c : r.listCells()) {
map.put(
Bytes.toString(c.getQualifierArray(), c.getQualifierOffset(), c.getQualifierLength()),
Bytes.toLong(c.getValueArray(), c.getValueOffset(), c.getValueLength()));
}
return map;
}
/**
* Get replication barriers for all peers in a region.
* @param encodedRegionName region's encoded name
* @return a list of barrier sequence numbers.
* @throws IOException
*/
public static List<Long> getReplicationBarriers(Connection connection, byte[] encodedRegionName)
throws IOException {
Get get = new Get(encodedRegionName);
get.addFamily(HConstants.REPLICATION_BARRIER_FAMILY);
Result r = get(getMetaHTable(connection), get);
List<Long> list = new ArrayList<>();
if (!r.isEmpty()) {
for (Cell cell : r.rawCells()) {
list.add(Bytes.toLong(cell.getQualifierArray(), cell.getQualifierOffset(),
cell.getQualifierLength()));
}
}
return list;
}
/**
* Get all barriers in all regions.
* @return a map of barrier lists in all regions
* @throws IOException
*/
public static Map<String, List<Long>> getAllBarriers(Connection connection) throws IOException {
Map<String, List<Long>> map = new HashMap<>();
Scan scan = new Scan();
scan.addFamily(HConstants.REPLICATION_BARRIER_FAMILY);
try (Table t = getMetaHTable(connection);
ResultScanner scanner = t.getScanner(scan)) {
Result result;
while ((result = scanner.next()) != null) {
String key = Bytes.toString(result.getRow());
List<Long> list = new ArrayList<>(result.rawCells().length);
for (Cell cell : result.rawCells()) {
list.add(Bytes.toLong(cell.getQualifierArray(), cell.getQualifierOffset(),
cell.getQualifierLength()));
}
map.put(key, list);
}
}
return map;
}
/**
* Get daughter region(s) for a region, only used in serial replication.
* @param connection connection we're using
* @param encodedName region's encoded name
* @throws IOException
*/
public static String getSerialReplicationDaughterRegion(Connection connection, byte[] encodedName)
throws IOException {
Get get = new Get(encodedName);
get.addColumn(HConstants.REPLICATION_META_FAMILY, daughterNameCq);
Result result = get(getMetaHTable(connection), get);
if (!result.isEmpty()) {
Cell c = result.rawCells()[0];
return Bytes.toString(c.getValueArray(), c.getValueOffset(), c.getValueLength());
}
return null;
}
/**
* Get parent region(s) for a region, only used in serial replication.
* @param connection connection we're using
* @param encodedName region's encoded name
* @throws IOException
*/
public static String getSerialReplicationParentRegion(Connection connection, byte[] encodedName)
throws IOException {
Get get = new Get(encodedName);
get.addColumn(HConstants.REPLICATION_META_FAMILY, parentNameCq);
Result result = get(getMetaHTable(connection), get);
if (!result.isEmpty()) {
Cell c = result.rawCells()[0];
return Bytes.toString(c.getValueArray(), c.getValueOffset(), c.getValueLength());
}
return null;
}
/**
* Get the table name for a region, only used in serial replication.
* @param connection connection we're using
* @param encodedName region's encoded name
* @throws IOException
*/
public static String getSerialReplicationTableName(Connection connection, byte[] encodedName)
throws IOException {
Get get = new Get(encodedName);
get.addColumn(HConstants.REPLICATION_META_FAMILY, tableNameCq);
Result result = get(getMetaHTable(connection), get);
if (!result.isEmpty()) {
Cell c = result.rawCells()[0];
return Bytes.toString(c.getValueArray(), c.getValueOffset(), c.getValueLength());
}
return null;
}
}