/**
* 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.cassandra.db;
import java.io.File;
import java.io.FilenameFilter;
import java.io.IOError;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.concurrent.ExecutionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.config.ConfigurationException;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.db.filter.QueryFilter;
import org.apache.cassandra.db.filter.QueryPath;
import org.apache.cassandra.db.marshal.BytesType;
import org.apache.cassandra.dht.IPartitioner;
import org.apache.cassandra.dht.Token;
import org.apache.cassandra.service.StorageService;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.FBUtilities;
public class SystemTable
{
private static Logger logger = LoggerFactory.getLogger(SystemTable.class);
public static final String STATUS_CF = "LocationInfo"; // keep the old CF string for backwards-compatibility
public static final String INDEX_CF = "IndexInfo";
private static final ByteBuffer LOCATION_KEY = ByteBufferUtil.bytes("L");
private static final ByteBuffer RING_KEY = ByteBufferUtil.bytes("Ring");
private static final ByteBuffer BOOTSTRAP_KEY = ByteBufferUtil.bytes("Bootstrap");
private static final ByteBuffer COOKIE_KEY = ByteBufferUtil.bytes("Cookies");
private static final ByteBuffer BOOTSTRAP = ByteBufferUtil.bytes("B");
private static final ByteBuffer TOKEN = ByteBufferUtil.bytes("Token");
private static final ByteBuffer GENERATION = ByteBufferUtil.bytes("Generation");
private static final ByteBuffer CLUSTERNAME = ByteBufferUtil.bytes("ClusterName");
private static final ByteBuffer PARTITIONER = ByteBufferUtil.bytes("Partioner");
private static DecoratedKey decorate(ByteBuffer key)
{
return StorageService.getPartitioner().decorateKey(key);
}
/* if hints become incompatible across versions of cassandra, that logic (and associated purging) is managed here. */
public static void purgeIncompatibleHints() throws IOException
{
// 0.6->0.7
final ByteBuffer hintsPurged6to7 = ByteBufferUtil.bytes("Hints purged as part of upgrading from 0.6.x to 0.7");
Table table = Table.open(Table.SYSTEM_TABLE);
QueryFilter dotSeven = QueryFilter.getNamesFilter(decorate(COOKIE_KEY), new QueryPath(STATUS_CF), hintsPurged6to7);
ColumnFamily cf = table.getColumnFamilyStore(STATUS_CF).getColumnFamily(dotSeven);
if (cf == null)
{
// upgrading from 0.6 to 0.7.
logger.info("Upgrading to 0.7. Purging hints if there are any. Old hints will be snapshotted.");
new Truncation(Table.SYSTEM_TABLE, HintedHandOffManager.HINTS_CF).apply();
RowMutation rm = new RowMutation(Table.SYSTEM_TABLE, COOKIE_KEY);
rm.add(new QueryPath(STATUS_CF, null, hintsPurged6to7), ByteBufferUtil.bytes("oh yes, it they were purged."), System.currentTimeMillis());
rm.apply();
}
}
/**
* Record token being used by another node
*/
public static synchronized void updateToken(InetAddress ep, Token token)
{
IPartitioner p = StorageService.getPartitioner();
ColumnFamily cf = ColumnFamily.create(Table.SYSTEM_TABLE, STATUS_CF);
cf.addColumn(new Column(p.getTokenFactory().toByteArray(token), ByteBuffer.wrap(ep.getAddress()), System.currentTimeMillis()));
RowMutation rm = new RowMutation(Table.SYSTEM_TABLE, RING_KEY);
rm.add(cf);
try
{
rm.apply();
}
catch (IOException e)
{
throw new IOError(e);
}
}
/**
* Remove stored token being used by another node
*/
public static synchronized void removeToken(Token token)
{
IPartitioner p = StorageService.getPartitioner();
RowMutation rm = new RowMutation(Table.SYSTEM_TABLE, RING_KEY);
rm.delete(new QueryPath(STATUS_CF, null, p.getTokenFactory().toByteArray(token)), System.currentTimeMillis());
try
{
rm.apply();
}
catch (IOException e)
{
throw new IOError(e);
}
}
/**
* This method is used to update the System Table with the new token for this node
*/
public static synchronized void updateToken(Token token)
{
IPartitioner p = StorageService.getPartitioner();
ColumnFamily cf = ColumnFamily.create(Table.SYSTEM_TABLE, STATUS_CF);
cf.addColumn(new Column(SystemTable.TOKEN, p.getTokenFactory().toByteArray(token), System.currentTimeMillis()));
RowMutation rm = new RowMutation(Table.SYSTEM_TABLE, LOCATION_KEY);
rm.add(cf);
try
{
rm.apply();
}
catch (IOException e)
{
throw new IOError(e);
}
forceBlockingFlush(STATUS_CF);
}
private static void forceBlockingFlush(String cfname)
{
try
{
Table.open(Table.SYSTEM_TABLE).getColumnFamilyStore(cfname).forceBlockingFlush();
}
catch (ExecutionException e)
{
throw new RuntimeException(e);
}
catch (InterruptedException e)
{
throw new AssertionError(e);
}
}
/**
* Return a map of stored tokens to IP addresses
*
*/
public static HashMap<Token, InetAddress> loadTokens()
{
HashMap<Token, InetAddress> tokenMap = new HashMap<Token, InetAddress>();
IPartitioner p = StorageService.getPartitioner();
Table table = Table.open(Table.SYSTEM_TABLE);
QueryFilter filter = QueryFilter.getIdentityFilter(decorate(RING_KEY), new QueryPath(STATUS_CF));
ColumnFamily cf = table.getColumnFamilyStore(STATUS_CF).getColumnFamily(filter);
if (cf != null)
{
for (IColumn column : cf.getSortedColumns())
{
try
{
ByteBuffer v = column.value();
byte[] addr = new byte[v.remaining()];
ByteBufferUtil.arrayCopy(v, v.position(), addr, 0, v.remaining());
tokenMap.put(p.getTokenFactory().fromByteArray(column.name()), InetAddress.getByAddress(addr));
}
catch (UnknownHostException e)
{
throw new IOError(e);
}
}
}
return tokenMap;
}
/**
* One of three things will happen if you try to read the system table:
* 1. files are present and you can read them: great
* 2. no files are there: great (new node is assumed)
* 3. files are present but you can't read them: bad (suspect that the partitioner was changed).
* @throws ConfigurationException
*/
public static void checkHealth() throws ConfigurationException, IOException
{
Table table = null;
try
{
table = Table.open(Table.SYSTEM_TABLE);
}
catch (AssertionError err)
{
// this happens when a user switches from OPP to RP.
ConfigurationException ex = new ConfigurationException("Could not read system table. Did you change partitioners?");
ex.initCause(err);
throw ex;
}
SortedSet<ByteBuffer> cols = new TreeSet<ByteBuffer>(BytesType.instance);
cols.add(PARTITIONER);
cols.add(CLUSTERNAME);
QueryFilter filter = QueryFilter.getNamesFilter(decorate(LOCATION_KEY), new QueryPath(STATUS_CF), cols);
ColumnFamily cf = table.getColumnFamilyStore(STATUS_CF).getColumnFamily(filter);
if (cf == null)
{
// this is either a brand new node (there will be no files), or the partitioner was changed from RP to OPP.
for (String path : DatabaseDescriptor.getAllDataFileLocationsForTable("system"))
{
File[] dbContents = new File(path).listFiles(new FilenameFilter()
{
public boolean accept(File dir, String name)
{
return name.endsWith(".db");
}
});
if (dbContents != null)
if (dbContents.length > 0)
throw new ConfigurationException("Found system table files, but they couldn't be loaded. Did you change the partitioner?");
}
// no system files. this is a new node.
RowMutation rm = new RowMutation(Table.SYSTEM_TABLE, LOCATION_KEY);
cf = ColumnFamily.create(Table.SYSTEM_TABLE, SystemTable.STATUS_CF);
cf.addColumn(new Column(PARTITIONER, ByteBufferUtil.bytes(DatabaseDescriptor.getPartitioner().getClass().getName()), FBUtilities.timestampMicros()));
cf.addColumn(new Column(CLUSTERNAME, ByteBufferUtil.bytes(DatabaseDescriptor.getClusterName()), FBUtilities.timestampMicros()));
rm.add(cf);
rm.apply();
return;
}
IColumn partitionerCol = cf.getColumn(PARTITIONER);
IColumn clusterCol = cf.getColumn(CLUSTERNAME);
assert partitionerCol != null;
assert clusterCol != null;
if (!DatabaseDescriptor.getPartitioner().getClass().getName().equals(ByteBufferUtil.string(partitionerCol.value())))
throw new ConfigurationException("Detected partitioner mismatch! Did you change the partitioner?");
String savedClusterName = ByteBufferUtil.string(clusterCol.value());
if (!DatabaseDescriptor.getClusterName().equals(savedClusterName))
throw new ConfigurationException("Saved cluster name " + savedClusterName + " != configured name " + DatabaseDescriptor.getClusterName());
}
public static Token getSavedToken()
{
Table table = Table.open(Table.SYSTEM_TABLE);
QueryFilter filter = QueryFilter.getNamesFilter(decorate(LOCATION_KEY), new QueryPath(STATUS_CF), TOKEN);
ColumnFamily cf = table.getColumnFamilyStore(STATUS_CF).getColumnFamily(filter);
return cf == null ? null : StorageService.getPartitioner().getTokenFactory().fromByteArray(cf.getColumn(TOKEN).value());
}
public static int incrementAndGetGeneration() throws IOException
{
Table table = Table.open(Table.SYSTEM_TABLE);
QueryFilter filter = QueryFilter.getNamesFilter(decorate(LOCATION_KEY), new QueryPath(STATUS_CF), GENERATION);
ColumnFamily cf = table.getColumnFamilyStore(STATUS_CF).getColumnFamily(filter);
int generation;
if (cf == null || !cf.findColumn(GENERATION))
{
// seconds-since-epoch isn't a foolproof new generation
// (where foolproof is "guaranteed to be larger than the last one seen at this ip address"),
// but it's as close as sanely possible
generation = (int) (System.currentTimeMillis() / 1000);
}
else
{
generation = Math.max(ByteBufferUtil.toInt(cf.getColumn(GENERATION).value()) + 1,
(int) (System.currentTimeMillis() / 1000));
}
RowMutation rm = new RowMutation(Table.SYSTEM_TABLE, LOCATION_KEY);
cf = ColumnFamily.create(Table.SYSTEM_TABLE, SystemTable.STATUS_CF);
cf.addColumn(new Column(GENERATION, ByteBufferUtil.bytes(generation), FBUtilities.timestampMicros()));
rm.add(cf);
rm.apply();
forceBlockingFlush(STATUS_CF);
return generation;
}
public static boolean isBootstrapped()
{
Table table = Table.open(Table.SYSTEM_TABLE);
QueryFilter filter = QueryFilter.getNamesFilter(decorate(BOOTSTRAP_KEY),
new QueryPath(STATUS_CF),
BOOTSTRAP);
ColumnFamily cf = table.getColumnFamilyStore(STATUS_CF).getColumnFamily(filter);
if (cf == null)
return false;
IColumn c = cf.getColumn(BOOTSTRAP);
return c.value().get(c.value().position()) == 1;
}
public static void setBootstrapped(boolean isBootstrapped)
{
ColumnFamily cf = ColumnFamily.create(Table.SYSTEM_TABLE, STATUS_CF);
cf.addColumn(new Column(BOOTSTRAP,
ByteBuffer.wrap(new byte[] { (byte) (isBootstrapped ? 1 : 0) }),
System.currentTimeMillis()));
RowMutation rm = new RowMutation(Table.SYSTEM_TABLE, BOOTSTRAP_KEY);
rm.add(cf);
try
{
rm.apply();
}
catch (IOException e)
{
throw new RuntimeException(e);
}
}
public static boolean isIndexBuilt(String table, String indexName)
{
ColumnFamilyStore cfs = Table.open(Table.SYSTEM_TABLE).getColumnFamilyStore(INDEX_CF);
QueryFilter filter = QueryFilter.getNamesFilter(decorate(ByteBufferUtil.bytes(table)),
new QueryPath(INDEX_CF),
ByteBufferUtil.bytes(indexName));
return cfs.getColumnFamily(filter) != null;
}
public static void setIndexBuilt(String table, String indexName)
{
ColumnFamily cf = ColumnFamily.create(Table.SYSTEM_TABLE, INDEX_CF);
cf.addColumn(new Column(ByteBufferUtil.bytes(indexName), ByteBufferUtil.EMPTY_BYTE_BUFFER, System.currentTimeMillis()));
RowMutation rm = new RowMutation(Table.SYSTEM_TABLE, ByteBufferUtil.bytes(table));
rm.add(cf);
try
{
rm.apply();
}
catch (IOException e)
{
throw new IOError(e);
}
forceBlockingFlush(INDEX_CF);
}
public static void setIndexRemoved(String table, String indexName)
{
RowMutation rm = new RowMutation(Table.SYSTEM_TABLE, ByteBufferUtil.bytes(table));
rm.delete(new QueryPath(INDEX_CF, null, ByteBufferUtil.bytes(indexName)), System.currentTimeMillis());
try
{
rm.apply();
}
catch (IOException e)
{
throw new IOError(e);
}
forceBlockingFlush(INDEX_CF);
}
}