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HADOOP-1820 Regionserver creates hlogs without bound 

git-svn-id: https://svn.apache.org/repos/asf/lucene/hadoop/trunk/src/contrib/hbase@579005 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Jim Kellerman 2007-09-24 22:52:16 +00:00
parent 8f3b423b73
commit 2cf41fe535
8 changed files with 366 additions and 156 deletions
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1
CHANGES.txt
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@ -44,6 +44,7 @@ Trunk (unreleased changes)
HADOOP-1801 When hdfs is yanked out from under hbase, hbase should go down gracefully
HADOOP-1813 OOME makes zombie of region server
HADOOP-1814 TestCleanRegionServerExit fails too often on Hudson
HADOOP-1820 Regionserver creates hlogs without bound
HADOOP-1821 Replace all String.getBytes() with String.getBytes("UTF-8")
HADOOP-1832 listTables() returns duplicate tables
HADOOP-1834 Scanners ignore timestamp passed on creation

270
src/java/org/apache/hadoop/hbase/HLog.java
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@ -29,6 +29,9 @@ import org.apache.hadoop.conf.*;
import java.io.*;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/**
* HLog stores all the edits to the HStore.
@ -53,6 +56,11 @@ import java.util.concurrent.atomic.AtomicInteger;
* older (smaller) than the most-recent CACHEFLUSH message for every HRegion
* that has a message in F.
*
* <p>synchronized methods can never execute in parallel. However, between the
* start of a cache flush and the completion point, appends are allowed but log
* rolling is not. To prevent log rolling taking place during this period, a
* separate reentrant lock is used.
*
* <p>TODO: Vuk Ercegovac also pointed out that keeping HBase HRegion edit logs
* in HDFS is currently flawed. HBase writes edits to logs and to a memcache.
* The 'atomic' write to the log is meant to serve as insurance against
@ -74,20 +82,21 @@ public class HLog implements HConstants {
SequenceFile.Writer writer;
TreeMap<Long, Path> outputfiles = new TreeMap<Long, Path>();
volatile boolean insideCacheFlush = false;
TreeMap<Text, Long> regionToLastFlush = new TreeMap<Text, Long>();
HashMap<Text, Long> lastSeqWritten = new HashMap<Text, Long>();
volatile boolean closed = false;
volatile long logSeqNum = 0;
long filenum = 0;
AtomicLong logSeqNum = new AtomicLong(0);
volatile long filenum = 0;
AtomicInteger numEntries = new AtomicInteger(0);
Integer rollLock = new Integer(0);
// This lock prevents starting a log roll during a cache flush.
// synchronized is insufficient because a cache flush spans two method calls.
private final Lock cacheFlushLock = new ReentrantLock();
/**
* Split up a bunch of log files, that are no longer being written to,
* into new files, one per region. Delete the old log files when ready.
* into new files, one per region. Delete the old log files when finished.
*
* @param rootDir Root directory of the HBase instance
* @param srcDir Directory of log files to split:
* e.g. <code>${ROOTDIR}/log_HOST_PORT</code>
@ -180,109 +189,105 @@ public class HLog implements HConstants {
fs.mkdirs(dir);
rollWriter();
}
/**
* Called by HRegionServer when it opens a new region to ensure that log
* sequence numbers are always greater than the latest sequence number of
* the region being brought on-line.
*
* @param newvalue
*/
synchronized void setSequenceNumber(long newvalue) {
if (newvalue > logSeqNum) {
if (newvalue > logSeqNum.get()) {
if (LOG.isDebugEnabled()) {
LOG.debug("changing sequence number from " + logSeqNum + " to " +
newvalue);
}
logSeqNum = newvalue;
logSeqNum.set(newvalue);
}
}
/**
* Roll the log writer. That is, start writing log messages to a new file.
*
* The 'rollLock' prevents us from entering rollWriter() more than
* once at a time.
*
* The 'this' lock limits access to the current writer so
* we don't append multiple items simultaneously.
*
* Because a log cannot be rolled during a cache flush, and a cache flush
* spans two method calls, a special lock needs to be obtained so that a
* cache flush cannot start when the log is being rolled and the log cannot
* be rolled during a cache flush.
*
* Note that this method cannot be synchronized because it is possible that
* startCacheFlush runs, obtaining the cacheFlushLock, then this method could
* start which would obtain the lock on this but block on obtaining the
* cacheFlushLock and then completeCacheFlush could be called which would
* wait for the lock on this and consequently never release the cacheFlushLock
*
* @throws IOException
*/
void rollWriter() throws IOException {
synchronized(rollLock) {
if(closed) {
throw new IOException("Cannot roll log; log is closed");
}
// Try to roll the writer to a new file. We may have to
// wait for a cache-flush to complete. In the process,
// compute a list of old log files that can be deleted.
cacheFlushLock.lock(); // prevent cache flushes
try {
// Now that we have locked out cache flushes, lock this to prevent other
// changes.
Vector<Path> toDeleteList = new Vector<Path>();
synchronized(this) {
if(closed) {
throw new IOException("Cannot roll log; log is closed");
}
// Make sure we do not roll the log while inside a
// cache-flush. Otherwise, the log sequence number for
// the CACHEFLUSH operation will appear in a "newer" log file
// than it should.
while(insideCacheFlush) {
try {
wait();
} catch (InterruptedException ie) {
// continue;
}
}
// Close the current writer (if any), and grab a new one.
if(writer != null) {
synchronized (this) {
if (writer != null) { // Close the current writer (if any), get a new one.
writer.close();
Path p = computeFilename(filenum - 1);
if(LOG.isDebugEnabled()) {
LOG.debug("Closing current log writer " + p.toString() +
" to get a new one");
" to get a new one");
}
if (filenum > 0) {
outputfiles.put(logSeqNum - 1, p);
outputfiles.put(logSeqNum.get() - 1, p);
}
}
Path newPath = computeFilename(filenum++);
this.writer = SequenceFile.createWriter(fs, conf, newPath,
HLogKey.class, HLogEdit.class);
if(LOG.isDebugEnabled()) {
this.writer = SequenceFile.createWriter(fs, conf, newPath, HLogKey.class,
HLogEdit.class);
if (LOG.isDebugEnabled()) {
LOG.debug("new log writer created at " + newPath);
}
// Can we delete any of the old log files?
// First, compute the oldest relevant log operation
// over all the regions.
long oldestOutstandingSeqNum = Long.MAX_VALUE;
for(Long l: regionToLastFlush.values()) {
for (Long l: lastSeqWritten.values()) {
long curSeqNum = l.longValue();
if(curSeqNum < oldestOutstandingSeqNum) {
if (curSeqNum < oldestOutstandingSeqNum) {
oldestOutstandingSeqNum = curSeqNum;
}
}
// Next, remove all files with a final ID that's older
// than the oldest pending region-operation.
for(Iterator<Long> it = outputfiles.keySet().iterator(); it.hasNext();) {
long maxSeqNum = it.next().longValue();
if(maxSeqNum < oldestOutstandingSeqNum) {
Path p = outputfiles.get(maxSeqNum);
it.remove();
toDeleteList.add(p);
} else {
break;
}
}
}
// Get the set of all sequence numbers that are older than the oldest
// pending region operation
// Actually delete them, if any!
for(Iterator<Path> it = toDeleteList.iterator(); it.hasNext(); ) {
Path p = it.next();
if(LOG.isDebugEnabled()) {
LOG.debug("removing old log file " + p.toString());
TreeSet<Long> sequenceNumbers = new TreeSet<Long>();
sequenceNumbers.addAll(
outputfiles.headMap(oldestOutstandingSeqNum).keySet());
// Remove all files with a final ID that's older than the oldest
// pending region-operation.
for (Long seq: sequenceNumbers) {
Path p = outputfiles.remove(seq);
if(LOG.isDebugEnabled()) {
LOG.debug("removing old log file " + p.toString());
}
fs.delete(p);
}
fs.delete(p);
this.numEntries.set(0);
}
this.numEntries.set(0);
} finally {
cacheFlushLock.unlock();
}
}
@ -328,7 +333,9 @@ public class HLog implements HConstants {
* other systems should process the log appropriately upon each startup
* (and prior to initializing HLog).
*
* We need to seize a lock on the writer so that writes are atomic.
* synchronized prevents appends during the completion of a cache flush or
* for the duration of a log roll.
*
* @param regionName
* @param tableName
* @param row
@ -337,21 +344,19 @@ public class HLog implements HConstants {
* @throws IOException
*/
synchronized void append(Text regionName, Text tableName, Text row,
TreeMap<Text, byte []> columns, long timestamp)
throws IOException {
TreeMap<Text, byte []> columns, long timestamp) throws IOException {
if(closed) {
throw new IOException("Cannot append; log is closed");
}
long seqNum[] = obtainSeqNum(columns.size());
// The 'regionToLastFlush' map holds the sequence id of the
// most recent flush for every regionName. However, for regions
// that don't have any flush yet, the relevant operation is the
// first one that's been added.
if (regionToLastFlush.get(regionName) == null) {
regionToLastFlush.put(regionName, seqNum[0]);
}
long seqNum[] = obtainSeqNum(columns.size());
// The 'lastSeqWritten' map holds the sequence number of the most recent
// write for each region. When the cache is flushed, the entry for the
// region being flushed is removed if the sequence number of the flush
// is greater than or equal to the value in lastSeqWritten
lastSeqWritten.put(regionName, seqNum[seqNum.length - 1]);
int counter = 0;
for (Map.Entry<Text, byte []> es: columns.entrySet()) {
@ -363,29 +368,39 @@ public class HLog implements HConstants {
}
}
/** @return How many items have been added to the log */
/**
* @return How many items have been added to the log
*
* Because numEntries is an AtomicInteger, no locking is required.
*/
int getNumEntries() {
return numEntries.get();
}
/**
* Obtain a log sequence number. This seizes the whole HLog
* lock, but it shouldn't last too long.
* Obtain a log sequence number.
*
* Because it is only called from a synchronized method, no additional locking
* is required.
*/
synchronized long obtainSeqNum() {
return logSeqNum++;
private long obtainSeqNum() {
return logSeqNum.getAndIncrement();
}
/**
* Obtain a specified number of sequence numbers
*
* Because it is only called from a synchronized method, no additional locking
* is required.
*
* @param num - number of sequence numbers to obtain
* @return - array of sequence numbers
*/
synchronized long[] obtainSeqNum(int num) {
private long[] obtainSeqNum(int num) {
long sequenceNumber = logSeqNum.getAndAdd(num);
long[] results = new long[num];
for (int i = 0; i < num; i++) {
results[i] = logSeqNum++;
results[i] = sequenceNumber++;
}
return results;
}
@ -394,54 +409,50 @@ public class HLog implements HConstants {
* By acquiring a log sequence ID, we can allow log messages
* to continue while we flush the cache.
*
* Set a flag so that we do not roll the log between the start
* and complete of a cache-flush. Otherwise the log-seq-id for
* Acquire a lock so that we do not roll the log between the start
* and completion of a cache-flush. Otherwise the log-seq-id for
* the flush will not appear in the correct logfile.
*
* @return sequence ID to pass {@link #completeCacheFlush(Text, Text, long)}
* @see #completeCacheFlush(Text, Text, long)
* @see #abortCacheFlush()
*/
synchronized long startCacheFlush() {
while (this.insideCacheFlush) {
try {
wait();
} catch (InterruptedException ie) {
// continue
}
}
this.insideCacheFlush = true;
notifyAll();
cacheFlushLock.lock();
return obtainSeqNum();
}
/** Complete the cache flush
/**
* Complete the cache flush
*
* Protected by this.lock()
*
* @param regionName
* @param tableName
* @param logSeqId
* @throws IOException
*/
synchronized void completeCacheFlush(final Text regionName,
final Text tableName, final long logSeqId)
throws IOException {
if(this.closed) {
return;
}
if (!this.insideCacheFlush) {
throw new IOException("Impossible situation: inside " +
"completeCacheFlush(), but 'insideCacheFlush' flag is false");
}
HLogKey key = new HLogKey(regionName, tableName, HLog.METAROW, logSeqId);
this.writer.append(key,
new HLogEdit(HLog.METACOLUMN, HGlobals.completeCacheFlush.get(),
System.currentTimeMillis()));
this.numEntries.getAndIncrement();
final Text tableName, final long logSeqId) throws IOException {
// Remember the most-recent flush for each region.
// This is used to delete obsolete log files.
this.regionToLastFlush.put(regionName, Long.valueOf(logSeqId));
try {
if(this.closed) {
return;
}
writer.append(new HLogKey(regionName, tableName, HLog.METAROW, logSeqId),
new HLogEdit(HLog.METACOLUMN, HGlobals.completeCacheFlush.get(),
System.currentTimeMillis()));
numEntries.getAndIncrement();
Long seq = lastSeqWritten.get(regionName);
if (seq != null && logSeqId >= seq) {
lastSeqWritten.remove(regionName);
}
cleanup();
} finally {
cacheFlushLock.unlock();
}
}
/**
@ -451,23 +462,8 @@ public class HLog implements HConstants {
* is a restart of the regionserver so the snapshot content dropped by the
* failure gets restored to the memcache.
*/
synchronized void abortCacheFlush() {
cleanup();
}
private synchronized void cleanup() {
this.insideCacheFlush = false;
notifyAll();
}
/**
* Abort a cache flush.
* This method will clear waits on {@link #insideCacheFlush} but if this
* method is called, we are losing data. TODO: Fix.
*/
synchronized void abort() {
this.insideCacheFlush = false;
notifyAll();
void abortCacheFlush() {
this.cacheFlushLock.unlock();
}
private static void usage() {

45
src/java/org/apache/hadoop/hbase/HRegion.java
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@ -210,6 +210,7 @@ public class HRegion implements HConstants {
final int memcacheFlushSize;
final int blockingMemcacheSize;
protected final long threadWakeFrequency;
protected final int optionalFlushCount;
private final HLocking lock = new HLocking();
private long desiredMaxFileSize;
private final long maxSequenceId;
@ -247,6 +248,8 @@ public class HRegion implements HConstants {
this.regionInfo = regionInfo;
this.memcache = new HMemcache();
this.threadWakeFrequency = conf.getLong(THREAD_WAKE_FREQUENCY, 10 * 1000);
this.optionalFlushCount =
conf.getInt("hbase.hregion.memcache.optionalflushcount", 10);
// Declare the regionName. This is a unique string for the region, used to
// build a unique filename.
@ -728,11 +731,13 @@ public class HRegion implements HConstants {
void optionallyFlush() throws IOException {
if(this.memcache.getSize() > this.memcacheFlushSize) {
flushcache(false);
} else if (this.memcache.getSize() > 0 && this.noFlushCount >= 10) {
LOG.info("Optional flush called " + this.noFlushCount +
" times when data present without flushing. Forcing one.");
flushcache(false);
if (this.memcache.getSize() > 0) {
} else if (this.memcache.getSize() > 0) {
if (this.noFlushCount >= this.optionalFlushCount) {
LOG.info("Optional flush called " + this.noFlushCount +
" times when data present without flushing. Forcing one.");
flushcache(false);
} else {
// Only increment if something in the cache.
// Gets zero'd when a flushcache is called.
this.noFlushCount++;
@ -864,25 +869,31 @@ public class HRegion implements HConstants {
retval.memcacheSnapshot.size());
}
// A. Flush memcache to all the HStores.
// Keep running vector of all store files that includes both old and the
// just-made new flush store file.
for (HStore hstore: stores.values()) {
hstore.flushCache(retval.memcacheSnapshot, retval.sequenceId);
try {
// A. Flush memcache to all the HStores.
// Keep running vector of all store files that includes both old and the
// just-made new flush store file.
for (HStore hstore: stores.values()) {
hstore.flushCache(retval.memcacheSnapshot, retval.sequenceId);
}
} catch (IOException e) {
// An exception here means that the snapshot was not persisted.
// The hlog needs to be replayed so its content is restored to memcache.
// Currently, only a server restart will do this.
this.log.abortCacheFlush();
throw new DroppedSnapshotException(e.getMessage());
}
// If we get to here, the HStores have been written. If we get an
// error in completeCacheFlush it will release the lock it is holding
// B. Write a FLUSHCACHE-COMPLETE message to the log.
// This tells future readers that the HStores were emitted correctly,
// and that all updates to the log for this regionName that have lower
// log-sequence-ids can be safely ignored.
this.log.completeCacheFlush(this.regionInfo.regionName,
regionInfo.tableDesc.getName(), logCacheFlushId);
} catch (IOException e) {
// An exception here means that the snapshot was not persisted.
// The hlog needs to be replayed so its content is restored to memcache.
// Currently, only a server restart will do this.
this.log.abortCacheFlush();
throw new DroppedSnapshotException(e.getMessage());
regionInfo.tableDesc.getName(), logCacheFlushId);
} finally {
// C. Delete the now-irrelevant memcache snapshot; its contents have been
// dumped to disk-based HStores or, if error, clear aborted snapshot.

4
src/test/org/apache/hadoop/hbase/TestDFSAbort.java
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@ -33,8 +33,8 @@ public class TestDFSAbort extends HBaseClusterTestCase {
/** constructor */
public TestDFSAbort() {
super();
conf.setInt("ipc.client.timeout", 5000); // reduce ipc client timeout
conf.setInt("ipc.client.connect.max.retries", 5); // and number of retries
// conf.setInt("ipc.client.timeout", 5000); // reduce ipc client timeout
// conf.setInt("ipc.client.connect.max.retries", 5); // and number of retries
Logger.getRootLogger().setLevel(Level.WARN);
Logger.getLogger(this.getClass().getPackage().getName()).setLevel(Level.DEBUG);
}

10
src/test/org/apache/hadoop/hbase/TestHBaseCluster.java
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@ -25,6 +25,8 @@ import java.util.Set;
import java.util.TreeMap;
import org.apache.hadoop.io.Text;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
/**
* Test HBase Master and Region servers, client API
@ -41,6 +43,14 @@ public class TestHBaseCluster extends HBaseClusterTestCase {
this.desc = null;
this.admin = null;
this.table = null;
Logger.getRootLogger().setLevel(Level.INFO);
// Make lease timeout longer, lease checks less frequent
conf.setInt("hbase.master.lease.period", 10 * 1000);
conf.setInt("hbase.master.lease.thread.wakefrequency", 5 * 1000);
// Increase the amount of time between client retries
conf.setLong("hbase.client.pause", 15 * 1000);
}
/**

174
src/test/org/apache/hadoop/hbase/TestLogRolling.java Normal file
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@ -0,0 +1,174 @@
/**
* 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;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.dfs.MiniDFSCluster;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
/**
* Test log deletion as logs are rolled.
*/
public class TestLogRolling extends HBaseTestCase {
private static final Log LOG = LogFactory.getLog(TestLogRolling.class);
private MiniDFSCluster dfs;
private MiniHBaseCluster cluster;
private Path logdir;
private String tableName;
private byte[] value;
/**
* constructor
* @throws Exception
*/
public TestLogRolling() throws Exception {
super();
this.dfs = null;
this.cluster = null;
this.logdir = null;
this.tableName = null;
this.value = null;
// We roll the log after every 256 writes
conf.setInt("hbase.regionserver.maxlogentries", 256);
// For less frequently updated regions flush after every 2 flushes
conf.setInt("hbase.hregion.memcache.optionalflushcount", 2);
// We flush the cache after every 8192 bytes
conf.setInt("hbase.hregion.memcache.flush.size", 8192);
// Make lease timeout longer, lease checks less frequent
conf.setInt("hbase.master.lease.period", 10 * 1000);
conf.setInt("hbase.master.lease.thread.wakefrequency", 5 * 1000);
// Increase the amount of time between client retries
conf.setLong("hbase.client.pause", 15 * 1000);
String className = this.getClass().getName();
StringBuilder v = new StringBuilder(className);
while (v.length() < 1000) {
v.append(className);
}
value = v.toString().getBytes(HConstants.UTF8_ENCODING);
}
/** {@inheritDoc} */
@Override
public void setUp() throws Exception {
super.setUp();
dfs = new MiniDFSCluster(conf, 2, true, (String[]) null);
}
/** {@inheritDoc} */
@Override
public void tearDown() throws Exception {
super.tearDown();
if (cluster != null) { // shutdown mini HBase cluster
cluster.shutdown();
}
assertEquals(0, countLogFiles(true));
if (dfs != null) { // shutdown mini DFS cluster
FileSystem fs = dfs.getFileSystem();
try {
dfs.shutdown();
} finally {
fs.close();
}
}
}
private void startAndWriteData() throws Exception {
cluster = new MiniHBaseCluster(conf, 1, dfs);
logdir = cluster.regionThreads.get(0).getRegionServer().getLog().dir;
// When the META table can be opened, the region servers are running
@SuppressWarnings("unused")
HTable meta = new HTable(conf, HConstants.META_TABLE_NAME);
// Create the test table and open it
HTableDescriptor desc = new HTableDescriptor(tableName);
desc.addFamily(new HColumnDescriptor(HConstants.COLUMN_FAMILY.toString()));
HBaseAdmin admin = new HBaseAdmin(conf);
admin.createTable(desc);
HTable table = new HTable(conf, new Text(tableName));
for (int i = 1; i <= 2048; i++) { // 2048 writes should cause 8 log rolls
long lockid =
table.startUpdate(new Text("row" + String.format("%1$04d", i)));
table.put(lockid, HConstants.COLUMN_FAMILY, value);
table.commit(lockid);
if (i % 256 == 0) {
// After every 256 writes sleep to let the log roller run
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
}
}
}
}
private int countLogFiles(boolean print) throws IOException {
Path[] logfiles = dfs.getFileSystem().listPaths(new Path[] {logdir});
if (print) {
for (int i = 0; i < logfiles.length; i++) {
if (LOG.isDebugEnabled()) {
LOG.debug("logfile: " + logfiles[i].toString());
}
}
}
if (LOG.isDebugEnabled()) {
LOG.debug("number of log files: " + logfiles.length);
}
return logfiles.length;
}
/**
* Tests that logs are deleted
*
* @throws Exception
*/
public void testLogRolling() throws Exception {
tableName = getName();
// Force a region split after every 768KB
conf.setLong("hbase.hregion.max.filesize", 768L * 1024L);
startAndWriteData();
LOG.info("Finished writing. Sleeping to let cache flusher and log roller run");
try {
// Wait for log roller and cache flusher to run a few times...
Thread.sleep(30L * 1000L);
} catch (InterruptedException e) {
LOG.info("Sleep interrupted", e);
}
LOG.info("Wake from sleep");
assertTrue(countLogFiles(true) <= 2);
}
}

9
src/test/org/apache/hadoop/hbase/TestSplit.java
View File

@ -38,6 +38,15 @@ public class TestSplit extends MultiRegionTable {
/** constructor */
public TestSplit() {
super();
// Make lease timeout longer, lease checks less frequent
conf.setInt("hbase.master.lease.period", 10 * 1000);
conf.setInt("hbase.master.lease.thread.wakefrequency", 5 * 1000);
// Increase the amount of time between client retries
conf.setLong("hbase.client.pause", 15 * 1000);
Logger.getRootLogger().setLevel(Level.WARN);
Logger.getLogger(this.getClass().getPackage().getName()).
setLevel(Level.DEBUG);

9
src/test/org/apache/hadoop/hbase/TestTableMapReduce.java
View File

@ -76,6 +76,15 @@ public class TestTableMapReduce extends MultiRegionTable {
fail();
}
}
/** constructor */
public TestTableMapReduce() {
super();
// Make lease timeout longer, lease checks less frequent
conf.setInt("hbase.master.lease.period", 10 * 1000);
conf.setInt("hbase.master.lease.thread.wakefrequency", 5 * 1000);
}
/**
* {@inheritDoc}