/**
* Copyright 2007 The Apache Software Foundation
*
* 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.regionserver.wal;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.impl.Log4JLogger;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.regionserver.wal.HLog.Reader;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.FSUtils;
import org.apache.hadoop.hdfs.DFSClient;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.FSConstants.SafeModeAction;
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.LeaseManager;
import org.apache.hadoop.io.SequenceFile;
import org.apache.log4j.Level;
import org.junit.After;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
/** JUnit test case for HLog */
public class TestHLog {
private static final Log LOG = LogFactory.getLog(TestHLog.class);
{
((Log4JLogger)DataNode.LOG).getLogger().setLevel(Level.ALL);
((Log4JLogger)LeaseManager.LOG).getLogger().setLevel(Level.ALL);
((Log4JLogger)FSNamesystem.LOG).getLogger().setLevel(Level.ALL);
((Log4JLogger)DFSClient.LOG).getLogger().setLevel(Level.ALL);
((Log4JLogger)HLog.LOG).getLogger().setLevel(Level.ALL);
}
private static Configuration conf;
private static FileSystem fs;
private static Path dir;
private static MiniDFSCluster cluster;
private final static HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
private static Path hbaseDir;
private static Path oldLogDir;
@Before
public void setUp() throws Exception {
FileStatus[] entries = fs.listStatus(new Path("/"));
for (FileStatus dir : entries) {
fs.delete(dir.getPath(), true);
}
}
@After
public void tearDown() throws Exception {
}
@BeforeClass
public static void setUpBeforeClass() throws Exception {
// Make block sizes small.
TEST_UTIL.getConfiguration().setInt("dfs.blocksize", 1024 * 1024);
TEST_UTIL.getConfiguration().setInt(
"hbase.regionserver.flushlogentries", 1);
// needed for testAppendClose()
TEST_UTIL.getConfiguration().setBoolean("dfs.support.append", true);
// quicker heartbeat interval for faster DN death notification
TEST_UTIL.getConfiguration().setInt("heartbeat.recheck.interval", 5000);
TEST_UTIL.getConfiguration().setInt("dfs.heartbeat.interval", 1);
TEST_UTIL.getConfiguration().setInt("dfs.socket.timeout", 5000);
// faster failover with cluster.shutdown();fs.close() idiom
TEST_UTIL.getConfiguration()
.setInt("ipc.client.connect.max.retries", 1);
TEST_UTIL.getConfiguration().setInt(
"dfs.client.block.recovery.retries", 1);
TEST_UTIL.startMiniCluster(3);
conf = TEST_UTIL.getConfiguration();
cluster = TEST_UTIL.getDFSCluster();
fs = cluster.getFileSystem();
hbaseDir = new Path(TEST_UTIL.getConfiguration().get("hbase.rootdir"));
oldLogDir = new Path(hbaseDir, ".oldlogs");
dir = new Path(hbaseDir, getName());
}
private static String getName() {
// TODO Auto-generated method stub
return "TestHLog";
}
/**
* Just write multiple logs then split. Before fix for HADOOP-2283, this
* would fail.
* @throws IOException
*/
@Test
public void testSplit() throws IOException {
final byte [] tableName = Bytes.toBytes(getName());
final byte [] rowName = tableName;
Path logdir = new Path(hbaseDir, HConstants.HREGION_LOGDIR_NAME);
HLog log = new HLog(fs, logdir, oldLogDir, conf);
final int howmany = 3;
HRegionInfo[] infos = new HRegionInfo[3];
Path tabledir = new Path(hbaseDir, getName());
fs.mkdirs(tabledir);
for(int i = 0; i < howmany; i++) {
infos[i] = new HRegionInfo(new HTableDescriptor(tableName),
Bytes.toBytes("" + i), Bytes.toBytes("" + (i+1)), false);
fs.mkdirs(new Path(tabledir, infos[i].getEncodedName()));
LOG.info("allo " + new Path(tabledir, infos[i].getEncodedName()).toString());
}
// Add edits for three regions.
try {
for (int ii = 0; ii < howmany; ii++) {
for (int i = 0; i < howmany; i++) {
for (int j = 0; j < howmany; j++) {
WALEdit edit = new WALEdit();
byte [] family = Bytes.toBytes("column");
byte [] qualifier = Bytes.toBytes(Integer.toString(j));
byte [] column = Bytes.toBytes("column:" + Integer.toString(j));
edit.add(new KeyValue(rowName, family, qualifier,
System.currentTimeMillis(), column));
LOG.info("Region " + i + ": " + edit);
log.append(infos[i], tableName, edit,
System.currentTimeMillis());
}
}
log.rollWriter();
}
log.close();
HLogSplitter logSplitter = HLogSplitter.createLogSplitter(conf,
hbaseDir, logdir, this.oldLogDir, this.fs);
List<Path> splits =
logSplitter.splitLog();
verifySplits(splits, howmany);
log = null;
} finally {
if (log != null) {
log.closeAndDelete();
}
}
}
/**
* Test new HDFS-265 sync.
* @throws Exception
*/
@Test
public void Broken_testSync() throws Exception {
byte [] bytes = Bytes.toBytes(getName());
// First verify that using streams all works.
Path p = new Path(dir, getName() + ".fsdos");
FSDataOutputStream out = fs.create(p);
out.write(bytes);
out.sync();
FSDataInputStream in = fs.open(p);
assertTrue(in.available() > 0);
byte [] buffer = new byte [1024];
int read = in.read(buffer);
assertEquals(bytes.length, read);
out.close();
in.close();
Path subdir = new Path(dir, "hlogdir");
HLog wal = new HLog(fs, subdir, oldLogDir, conf);
final int total = 20;
HRegionInfo info = new HRegionInfo(new HTableDescriptor(bytes),
null,null, false);
for (int i = 0; i < total; i++) {
WALEdit kvs = new WALEdit();
kvs.add(new KeyValue(Bytes.toBytes(i), bytes, bytes));
wal.append(info, bytes, kvs, System.currentTimeMillis());
}
// Now call sync and try reading. Opening a Reader before you sync just
// gives you EOFE.
wal.sync();
// Open a Reader.
Path walPath = wal.computeFilename();
HLog.Reader reader = HLog.getReader(fs, walPath, conf);
int count = 0;
HLog.Entry entry = new HLog.Entry();
while ((entry = reader.next(entry)) != null) count++;
assertEquals(total, count);
reader.close();
// Add test that checks to see that an open of a Reader works on a file
// that has had a sync done on it.
for (int i = 0; i < total; i++) {
WALEdit kvs = new WALEdit();
kvs.add(new KeyValue(Bytes.toBytes(i), bytes, bytes));
wal.append(info, bytes, kvs, System.currentTimeMillis());
}
reader = HLog.getReader(fs, walPath, conf);
count = 0;
while((entry = reader.next(entry)) != null) count++;
assertTrue(count >= total);
reader.close();
// If I sync, should see double the edits.
wal.sync();
reader = HLog.getReader(fs, walPath, conf);
count = 0;
while((entry = reader.next(entry)) != null) count++;
assertEquals(total * 2, count);
// Now do a test that ensures stuff works when we go over block boundary,
// especially that we return good length on file.
final byte [] value = new byte[1025 * 1024]; // Make a 1M value.
for (int i = 0; i < total; i++) {
WALEdit kvs = new WALEdit();
kvs.add(new KeyValue(Bytes.toBytes(i), bytes, value));
wal.append(info, bytes, kvs, System.currentTimeMillis());
}
// Now I should have written out lots of blocks. Sync then read.
wal.sync();
reader = HLog.getReader(fs, walPath, conf);
count = 0;
while((entry = reader.next(entry)) != null) count++;
assertEquals(total * 3, count);
reader.close();
// Close it and ensure that closed, Reader gets right length also.
wal.close();
reader = HLog.getReader(fs, walPath, conf);
count = 0;
while((entry = reader.next(entry)) != null) count++;
assertEquals(total * 3, count);
reader.close();
}
/**
* Test the findMemstoresWithEditsEqualOrOlderThan method.
* @throws IOException
*/
@Test
public void testFindMemstoresWithEditsEqualOrOlderThan() throws IOException {
Map<byte [], Long> regionsToSeqids = new HashMap<byte [], Long>();
for (int i = 0; i < 10; i++) {
Long l = Long.valueOf(i);
regionsToSeqids.put(l.toString().getBytes(), l);
}
byte [][] regions =
HLog.findMemstoresWithEditsEqualOrOlderThan(1, regionsToSeqids);
assertEquals(2, regions.length);
assertTrue(Bytes.equals(regions[0], "0".getBytes()) ||
Bytes.equals(regions[0], "1".getBytes()));
regions = HLog.findMemstoresWithEditsEqualOrOlderThan(3, regionsToSeqids);
int count = 4;
assertEquals(count, regions.length);
// Regions returned are not ordered.
for (int i = 0; i < count; i++) {
assertTrue(Bytes.equals(regions[i], "0".getBytes()) ||
Bytes.equals(regions[i], "1".getBytes()) ||
Bytes.equals(regions[i], "2".getBytes()) ||
Bytes.equals(regions[i], "3".getBytes()));
}
}
private void verifySplits(List<Path> splits, final int howmany)
throws IOException {
assertEquals(howmany, splits.size());
for (int i = 0; i < splits.size(); i++) {
LOG.info("Verifying=" + splits.get(i));
HLog.Reader reader = HLog.getReader(fs, splits.get(i), conf);
try {
int count = 0;
String previousRegion = null;
long seqno = -1;
HLog.Entry entry = new HLog.Entry();
while((entry = reader.next(entry)) != null) {
HLogKey key = entry.getKey();
String region = Bytes.toString(key.getEncodedRegionName());
// Assert that all edits are for same region.
if (previousRegion != null) {
assertEquals(previousRegion, region);
}
LOG.info("oldseqno=" + seqno + ", newseqno=" + key.getLogSeqNum());
assertTrue(seqno < key.getLogSeqNum());
seqno = key.getLogSeqNum();
previousRegion = region;
count++;
}
assertEquals(howmany * howmany, count);
} finally {
reader.close();
}
}
}
// For this test to pass, requires:
// 1. HDFS-200 (append support)
// 2. HDFS-988 (SafeMode should freeze file operations
// [FSNamesystem.nextGenerationStampForBlock])
// 3. HDFS-142 (on restart, maintain pendingCreates)
@Test
public void testAppendClose() throws Exception {
byte [] tableName = Bytes.toBytes(getName());
HRegionInfo regioninfo = new HRegionInfo(new HTableDescriptor(tableName),
HConstants.EMPTY_START_ROW, HConstants.EMPTY_END_ROW, false);
Path subdir = new Path(dir, "hlogdir");
Path archdir = new Path(dir, "hlogdir_archive");
HLog wal = new HLog(fs, subdir, archdir, conf);
final int total = 20;
for (int i = 0; i < total; i++) {
WALEdit kvs = new WALEdit();
kvs.add(new KeyValue(Bytes.toBytes(i), tableName, tableName));
wal.append(regioninfo, tableName, kvs, System.currentTimeMillis());
}
// Now call sync to send the data to HDFS datanodes
wal.sync();
int namenodePort = cluster.getNameNodePort();
final Path walPath = wal.computeFilename();
// Stop the cluster. (ensure restart since we're sharing MiniDFSCluster)
try {
cluster.getNameNode().setSafeMode(SafeModeAction.SAFEMODE_ENTER);
cluster.shutdown();
try {
// wal.writer.close() will throw an exception,
// but still call this since it closes the LogSyncer thread first
wal.close();
} catch (IOException e) {
LOG.info(e);
}
fs.close(); // closing FS last so DFSOutputStream can't call close
LOG.info("STOPPED first instance of the cluster");
} finally {
// Restart the cluster
while (cluster.isClusterUp()){
LOG.error("Waiting for cluster to go down");
Thread.sleep(1000);
}
cluster = new MiniDFSCluster(namenodePort, conf, 5, false, true, true, null, null, null, null);
cluster.waitActive();
fs = cluster.getFileSystem();
LOG.info("START second instance.");
}
// set the lease period to be 1 second so that the
// namenode triggers lease recovery upon append request
Method setLeasePeriod = cluster.getClass()
.getDeclaredMethod("setLeasePeriod", new Class[]{Long.TYPE, Long.TYPE});
setLeasePeriod.setAccessible(true);
setLeasePeriod.invoke(cluster,
new Object[]{new Long(1000), new Long(1000)});
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
LOG.info(e);
}
// Now try recovering the log, like the HMaster would do
final FileSystem recoveredFs = fs;
final Configuration rlConf = conf;
class RecoverLogThread extends Thread {
public Exception exception = null;
public void run() {
try {
FSUtils.recoverFileLease(recoveredFs, walPath, rlConf);
} catch (IOException e) {
exception = e;
}
}
}
RecoverLogThread t = new RecoverLogThread();
t.start();
// Timeout after 60 sec. Without correct patches, would be an infinite loop
t.join(60 * 1000);
if(t.isAlive()) {
t.interrupt();
throw new Exception("Timed out waiting for HLog.recoverLog()");
}
if (t.exception != null)
throw t.exception;
// Make sure you can read all the content
SequenceFile.Reader reader
= new SequenceFile.Reader(this.fs, walPath, this.conf);
int count = 0;
HLogKey key = HLog.newKey(conf);
WALEdit val = new WALEdit();
while (reader.next(key, val)) {
count++;
assertTrue("Should be one KeyValue per WALEdit",
val.getKeyValues().size() == 1);
}
assertEquals(total, count);
reader.close();
}
/**
* Tests that we can write out an edit, close, and then read it back in again.
* @throws IOException
*/
@Test
public void testEditAdd() throws IOException {
final int COL_COUNT = 10;
final byte [] tableName = Bytes.toBytes("tablename");
final byte [] row = Bytes.toBytes("row");
HLog.Reader reader = null;
HLog log = new HLog(fs, dir, oldLogDir, conf);
try {
// Write columns named 1, 2, 3, etc. and then values of single byte
// 1, 2, 3...
long timestamp = System.currentTimeMillis();
WALEdit cols = new WALEdit();
for (int i = 0; i < COL_COUNT; i++) {
cols.add(new KeyValue(row, Bytes.toBytes("column"),
Bytes.toBytes(Integer.toString(i)),
timestamp, new byte[] { (byte)(i + '0') }));
}
HRegionInfo info = new HRegionInfo(new HTableDescriptor(tableName),
row,Bytes.toBytes(Bytes.toString(row) + "1"), false);
log.append(info, tableName, cols, System.currentTimeMillis());
long logSeqId = log.startCacheFlush();
log.completeCacheFlush(info.getEncodedNameAsBytes(), tableName, logSeqId, info.isMetaRegion());
log.close();
Path filename = log.computeFilename();
log = null;
// Now open a reader on the log and assert append worked.
reader = HLog.getReader(fs, filename, conf);
// Above we added all columns on a single row so we only read one
// entry in the below... thats why we have '1'.
for (int i = 0; i < 1; i++) {
HLog.Entry entry = reader.next(null);
if (entry == null) break;
HLogKey key = entry.getKey();
WALEdit val = entry.getEdit();
assertTrue(Bytes.equals(info.getEncodedNameAsBytes(), key.getEncodedRegionName()));
assertTrue(Bytes.equals(tableName, key.getTablename()));
KeyValue kv = val.getKeyValues().get(0);
assertTrue(Bytes.equals(row, kv.getRow()));
assertEquals((byte)(i + '0'), kv.getValue()[0]);
System.out.println(key + " " + val);
}
HLog.Entry entry = null;
while ((entry = reader.next(null)) != null) {
HLogKey key = entry.getKey();
WALEdit val = entry.getEdit();
// Assert only one more row... the meta flushed row.
assertTrue(Bytes.equals(info.getEncodedNameAsBytes(), key.getEncodedRegionName()));
assertTrue(Bytes.equals(tableName, key.getTablename()));
KeyValue kv = val.getKeyValues().get(0);
assertTrue(Bytes.equals(HLog.METAROW, kv.getRow()));
assertTrue(Bytes.equals(HLog.METAFAMILY, kv.getFamily()));
assertEquals(0, Bytes.compareTo(HLog.COMPLETE_CACHE_FLUSH,
val.getKeyValues().get(0).getValue()));
System.out.println(key + " " + val);
}
} finally {
if (log != null) {
log.closeAndDelete();
}
if (reader != null) {
reader.close();
}
}
}
/**
* @throws IOException
*/
@Test
public void testAppend() throws IOException {
final int COL_COUNT = 10;
final byte [] tableName = Bytes.toBytes("tablename");
final byte [] row = Bytes.toBytes("row");
Reader reader = null;
HLog log = new HLog(fs, dir, oldLogDir, conf);
try {
// Write columns named 1, 2, 3, etc. and then values of single byte
// 1, 2, 3...
long timestamp = System.currentTimeMillis();
WALEdit cols = new WALEdit();
for (int i = 0; i < COL_COUNT; i++) {
cols.add(new KeyValue(row, Bytes.toBytes("column"),
Bytes.toBytes(Integer.toString(i)),
timestamp, new byte[] { (byte)(i + '0') }));
}
HRegionInfo hri = new HRegionInfo(new HTableDescriptor(tableName),
HConstants.EMPTY_START_ROW, HConstants.EMPTY_END_ROW);
log.append(hri, tableName, cols, System.currentTimeMillis());
long logSeqId = log.startCacheFlush();
log.completeCacheFlush(hri.getEncodedNameAsBytes(), tableName, logSeqId, false);
log.close();
Path filename = log.computeFilename();
log = null;
// Now open a reader on the log and assert append worked.
reader = HLog.getReader(fs, filename, conf);
HLog.Entry entry = reader.next();
assertEquals(COL_COUNT, entry.getEdit().size());
int idx = 0;
for (KeyValue val : entry.getEdit().getKeyValues()) {
assertTrue(Bytes.equals(hri.getEncodedNameAsBytes(),
entry.getKey().getEncodedRegionName()));
assertTrue(Bytes.equals(tableName, entry.getKey().getTablename()));
assertTrue(Bytes.equals(row, val.getRow()));
assertEquals((byte)(idx + '0'), val.getValue()[0]);
System.out.println(entry.getKey() + " " + val);
idx++;
}
// Get next row... the meta flushed row.
entry = reader.next();
assertEquals(1, entry.getEdit().size());
for (KeyValue val : entry.getEdit().getKeyValues()) {
assertTrue(Bytes.equals(hri.getEncodedNameAsBytes(),
entry.getKey().getEncodedRegionName()));
assertTrue(Bytes.equals(tableName, entry.getKey().getTablename()));
assertTrue(Bytes.equals(HLog.METAROW, val.getRow()));
assertTrue(Bytes.equals(HLog.METAFAMILY, val.getFamily()));
assertEquals(0, Bytes.compareTo(HLog.COMPLETE_CACHE_FLUSH,
val.getValue()));
System.out.println(entry.getKey() + " " + val);
}
} finally {
if (log != null) {
log.closeAndDelete();
}
if (reader != null) {
reader.close();
}
}
}
/**
* Test that we can visit entries before they are appended
* @throws Exception
*/
@Test
public void testVisitors() throws Exception {
final int COL_COUNT = 10;
final byte [] tableName = Bytes.toBytes("tablename");
final byte [] row = Bytes.toBytes("row");
HLog log = new HLog(fs, dir, oldLogDir, conf);
DumbWALObserver visitor = new DumbWALObserver();
log.registerWALActionsListener(visitor);
long timestamp = System.currentTimeMillis();
HRegionInfo hri = new HRegionInfo(new HTableDescriptor(tableName),
HConstants.EMPTY_START_ROW, HConstants.EMPTY_END_ROW);
for (int i = 0; i < COL_COUNT; i++) {
WALEdit cols = new WALEdit();
cols.add(new KeyValue(row, Bytes.toBytes("column"),
Bytes.toBytes(Integer.toString(i)),
timestamp, new byte[]{(byte) (i + '0')}));
log.append(hri, tableName, cols, System.currentTimeMillis());
}
assertEquals(COL_COUNT, visitor.increments);
log.unregisterWALActionsListener(visitor);
WALEdit cols = new WALEdit();
cols.add(new KeyValue(row, Bytes.toBytes("column"),
Bytes.toBytes(Integer.toString(11)),
timestamp, new byte[]{(byte) (11 + '0')}));
log.append(hri, tableName, cols, System.currentTimeMillis());
assertEquals(COL_COUNT, visitor.increments);
}
@Test
public void testLogCleaning() throws Exception {
LOG.info("testLogCleaning");
final byte [] tableName = Bytes.toBytes("testLogCleaning");
final byte [] tableName2 = Bytes.toBytes("testLogCleaning2");
HLog log = new HLog(fs, dir, oldLogDir, conf);
HRegionInfo hri = new HRegionInfo(new HTableDescriptor(tableName),
HConstants.EMPTY_START_ROW, HConstants.EMPTY_END_ROW);
HRegionInfo hri2 = new HRegionInfo(new HTableDescriptor(tableName2),
HConstants.EMPTY_START_ROW, HConstants.EMPTY_END_ROW);
// Add a single edit and make sure that rolling won't remove the file
// Before HBASE-3198 it used to delete it
addEdits(log, hri, tableName, 1);
log.rollWriter();
assertEquals(1, log.getNumLogFiles());
// See if there's anything wrong with more than 1 edit
addEdits(log, hri, tableName, 2);
log.rollWriter();
assertEquals(2, log.getNumLogFiles());
// Now mix edits from 2 regions, still no flushing
addEdits(log, hri, tableName, 1);
addEdits(log, hri2, tableName2, 1);
addEdits(log, hri, tableName, 1);
addEdits(log, hri2, tableName2, 1);
log.rollWriter();
assertEquals(3, log.getNumLogFiles());
// Flush the first region, we expect to see the first two files getting
// archived
long seqId = log.startCacheFlush();
log.completeCacheFlush(hri.getEncodedNameAsBytes(), tableName, seqId, false);
log.rollWriter();
assertEquals(2, log.getNumLogFiles());
// Flush the second region, which removes all the remaining output files
// since the oldest was completely flushed and the two others only contain
// flush information
seqId = log.startCacheFlush();
log.completeCacheFlush(hri2.getEncodedNameAsBytes(), tableName2, seqId, false);
log.rollWriter();
assertEquals(0, log.getNumLogFiles());
}
private void addEdits(HLog log, HRegionInfo hri, byte [] tableName,
int times) throws IOException {
final byte [] row = Bytes.toBytes("row");
for (int i = 0; i < times; i++) {
long timestamp = System.currentTimeMillis();
WALEdit cols = new WALEdit();
cols.add(new KeyValue(row, row, row, timestamp, row));
log.append(hri, tableName, cols, timestamp);
}
}
static class DumbWALObserver implements WALObserver {
int increments = 0;
@Override
public void visitLogEntryBeforeWrite(HRegionInfo info, HLogKey logKey,
WALEdit logEdit) {
increments++;
}
@Override
public void logRolled(Path newFile) {
// TODO Auto-generated method stub
}
@Override
public void logRollRequested() {
// TODO Auto-generated method stub
}
@Override
public void logCloseRequested() {
// not interested
}
}
}