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HBASE-1311 ZooKeeperWrapper: Failed to set watcher on ZNode /hbase/master 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/hbase/trunk@773677 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael Stack 2009-05-11 20:21:59 +00:00
parent 3867c4c9e4
commit 135daf0c41
6 changed files with 203 additions and 68 deletions
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2
CHANGES.txt
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@ -121,6 +121,8 @@ Release 0.20.0 - Unreleased
(Ryan Rawson via Stack)
HBASE-1399 Can't drop tables since HBASE-1398 (Ryan Rawson via Andrew
Purtell)
HBASE-1311 ZooKeeperWrapper: Failed to set watcher on ZNode /hbase/master
(Nitay Joffe via Stack)
IMPROVEMENTS
HBASE-1089 Add count of regions on filesystem to master UI; add percentage

12
src/java/org/apache/hadoop/hbase/master/RegionManager.java
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@ -522,6 +522,18 @@ class RegionManager implements HConstants {
}
}
public boolean metaRegionsInTransition() {
synchronized (onlineMetaRegions) {
for (MetaRegion metaRegion : onlineMetaRegions.values()) {
String regionName = Bytes.toString(metaRegion.getRegionName());
if (regionIsInTransition(regionName)) {
return true;
}
}
}
return false;
}
/**
* Stop the root and meta scanners so that the region servers serving meta
* regions can shut down.

5
src/java/org/apache/hadoop/hbase/master/RegionServerOperation.java
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@ -69,8 +69,9 @@ abstract class RegionServerOperation implements Delayed, HConstants {
protected boolean metaTableAvailable() {
boolean available = true;
if (master.regionManager.numMetaRegions() !=
master.regionManager.numOnlineMetaRegions()) {
if ((master.regionManager.numMetaRegions() !=
master.regionManager.numOnlineMetaRegions()) ||
master.regionManager.metaRegionsInTransition()) {
// We can't proceed because not all of the meta regions are online.
// We can't block either because that would prevent the meta region
// online message from being processed. In order to prevent spinning

190
src/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
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@ -107,6 +107,7 @@ import org.apache.hadoop.util.StringUtils;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.Watcher.Event.KeeperState;
/**
* HRegionServer makes a set of HRegions available to clients. It checks in with
@ -136,7 +137,7 @@ public class HRegionServer implements HConstants, HRegionInterface,
// If false, the file system has become unavailable
protected volatile boolean fsOk;
protected final HServerInfo serverInfo;
protected HServerInfo serverInfo;
protected final HBaseConfiguration conf;
private final ServerConnection connection;
@ -167,10 +168,10 @@ public class HRegionServer implements HConstants, HRegionInterface,
// Server to handle client requests. Default access so can be accessed by
// unit tests.
final HBaseServer server;
HBaseServer server;
// Leases
private final Leases leases;
private Leases leases;
// Request counter
private volatile AtomicInteger requestCount = new AtomicInteger();
@ -193,20 +194,20 @@ public class HRegionServer implements HConstants, HRegionInterface,
private RegionServerMetrics metrics;
// Compactions
final CompactSplitThread compactSplitThread;
CompactSplitThread compactSplitThread;
// Cache flushing
final MemcacheFlusher cacheFlusher;
MemcacheFlusher cacheFlusher;
/* Check for major compactions.
*/
final Chore majorCompactionChecker;
Chore majorCompactionChecker;
// HLog and HLog roller. log is protected rather than private to avoid
// eclipse warning when accessed by inner classes
protected volatile HLog log;
final LogRoller logRoller;
final LogFlusher logFlusher;
LogRoller logRoller;
LogFlusher logFlusher;
// limit compactions while starting up
CompactionLimitThread compactionLimitThread;
@ -217,13 +218,23 @@ public class HRegionServer implements HConstants, HRegionInterface,
final Map<String, InternalScanner> scanners =
new ConcurrentHashMap<String, InternalScanner>();
private final ZooKeeperWrapper zooKeeperWrapper;
private ZooKeeperWrapper zooKeeperWrapper;
// A sleeper that sleeps for msgInterval.
private final Sleeper sleeper;
private final long rpcTimeout;
// Address passed in to constructor.
private final HServerAddress address;
// The main region server thread.
private Thread regionServerThread;
// Run HDFS shutdown thread on exit if this is set. We clear this out when
// doing a restart() to prevent closing of HDFS.
private final AtomicBoolean shutdownHDFS = new AtomicBoolean(true);
/**
* Starts a HRegionServer at the default location
* @param conf
@ -242,6 +253,7 @@ public class HRegionServer implements HConstants, HRegionInterface,
*/
public HRegionServer(HServerAddress address, HBaseConfiguration conf)
throws IOException {
this.address = address;
this.abortRequested = false;
this.fsOk = true;
this.conf = conf;
@ -258,6 +270,73 @@ public class HRegionServer implements HConstants, HRegionInterface,
sleeper = new Sleeper(this.msgInterval, this.stopRequested);
// Task thread to process requests from Master
this.worker = new Worker();
this.numRegionsToReport =
conf.getInt("hbase.regionserver.numregionstoreport", 10);
this.rpcTimeout = conf.getLong("hbase.regionserver.lease.period", 60000);
reinitialize();
}
/**
* Creates all of the state that needs to be reconstructed in case we are
* doing a restart. This is shared between the constructor and restart().
* @throws IOException
*/
private void reinitialize() throws IOException {
abortRequested = false;
stopRequested.set(false);
shutdownHDFS.set(true);
// Server to handle client requests
this.server = HBaseRPC.getServer(this, address.getBindAddress(),
address.getPort(), conf.getInt("hbase.regionserver.handler.count", 10),
false, conf);
this.server.setErrorHandler(this);
String machineName = DNS.getDefaultHost(
conf.get("hbase.regionserver.dns.interface","default"),
conf.get("hbase.regionserver.dns.nameserver","default"));
// Address is givin a default IP for the moment. Will be changed after
// calling the master.
this.serverInfo = new HServerInfo(new HServerAddress(
new InetSocketAddress(address.getBindAddress(),
this.server.getListenerAddress().getPort())), System.currentTimeMillis(),
this.conf.getInt("hbase.regionserver.info.port", 60030), machineName);
if (this.serverInfo.getServerAddress() == null) {
throw new NullPointerException("Server address cannot be null; " +
"hbase-958 debugging");
}
reinitializeThreads();
reinitializeZooKeeper();
int nbBlocks = conf.getInt("hbase.regionserver.nbreservationblocks", 4);
for(int i = 0; i < nbBlocks; i++) {
reservedSpace.add(new byte[DEFAULT_SIZE_RESERVATION_BLOCK]);
}
}
private void reinitializeZooKeeper() throws IOException {
zooKeeperWrapper = new ZooKeeperWrapper(conf);
watchMasterAddress();
boolean startCodeOk = false;
while(!startCodeOk) {
serverInfo.setStartCode(System.currentTimeMillis());
startCodeOk = zooKeeperWrapper.writeRSLocation(serverInfo);
if(!startCodeOk) {
LOG.debug("Start code already taken, trying another one");
}
}
}
private void reinitializeThreads() {
this.workerThread = new Thread(worker);
// Cache flushing thread.
this.cacheFlusher = new MemcacheFlusher(conf, this);
@ -278,53 +357,9 @@ public class HRegionServer implements HConstants, HRegionInterface,
this.majorCompactionChecker = new MajorCompactionChecker(this,
this.threadWakeFrequency * multiplier, this.stopRequested);
// Task thread to process requests from Master
this.worker = new Worker();
this.workerThread = new Thread(worker);
// Server to handle client requests
this.server = HBaseRPC.getServer(this, address.getBindAddress(),
address.getPort(), conf.getInt("hbase.regionserver.handler.count", 10),
false, conf);
this.server.setErrorHandler(this);
String machineName = DNS.getDefaultHost(
conf.get("hbase.regionserver.dns.interface","default"),
conf.get("hbase.regionserver.dns.nameserver","default"));
// Address is givin a default IP for the moment. Will be changed after
// calling the master.
this.serverInfo = new HServerInfo(new HServerAddress(
new InetSocketAddress(address.getBindAddress(),
this.server.getListenerAddress().getPort())), System.currentTimeMillis(),
this.conf.getInt("hbase.regionserver.info.port", 60030), machineName);
if (this.serverInfo.getServerAddress() == null) {
throw new NullPointerException("Server address cannot be null; " +
"hbase-958 debugging");
}
this.zooKeeperWrapper = new ZooKeeperWrapper(conf);
watchMasterAddress();
boolean startCodeOk = false;
while(!startCodeOk) {
serverInfo.setStartCode(System.currentTimeMillis());
startCodeOk = zooKeeperWrapper.writeRSLocation(serverInfo);
if(!startCodeOk) {
LOG.debug("Start code already taken, trying another one");
}
}
this.numRegionsToReport =
conf.getInt("hbase.regionserver.numregionstoreport", 10);
this.leases = new Leases(
conf.getInt("hbase.regionserver.lease.period", 60 * 1000),
this.threadWakeFrequency);
int nbBlocks = conf.getInt("hbase.regionserver.nbreservationblocks", 4);
for(int i = 0; i < nbBlocks; i++) {
reservedSpace.add(new byte[DEFAULT_SIZE_RESERVATION_BLOCK]);
}
this.rpcTimeout = conf.getLong("hbase.regionserver.lease.period", 60000);
}
/**
@ -336,15 +371,26 @@ public class HRegionServer implements HConstants, HRegionInterface,
*/
public void process(WatchedEvent event) {
EventType type = event.getType();
LOG.info("Got ZooKeeper event, state: " + event.getState() + ", type: " +
KeeperState state = event.getState();
LOG.info("Got ZooKeeper event, state: " + state + ", type: " +
type + ", path: " + event.getPath());
if (type == EventType.NodeCreated) {
getMaster();
// Ignore events if we're shutting down.
if (stopRequested.get()) {
LOG.debug("Ignoring ZooKeeper event while shutting down");
return;
}
if (state == KeeperState.Expired) {
LOG.error("ZooKeeper session expired");
restart();
} else if (type == EventType.NodeCreated) {
getMaster();
// ZooKeeper watches are one time only, so we need to re-register our watch.
watchMasterAddress();
}
}
private void watchMasterAddress() {
while (!stopRequested.get() && !zooKeeperWrapper.watchMasterAddress(this)) {
@ -353,12 +399,41 @@ public class HRegionServer implements HConstants, HRegionInterface,
}
}
private void restart() {
LOG.info("Restarting Region Server");
shutdownHDFS.set(false);
abort();
Threads.shutdown(regionServerThread);
boolean done = false;
while (!done) {
try {
reinitialize();
done = true;
} catch (IOException e) {
LOG.debug("Error trying to reinitialize ZooKeeper", e);
}
}
Thread t = new Thread(this);
String name = regionServerThread.getName();
t.setName(name);
t.start();
}
/** @return ZooKeeperWrapper used by RegionServer. */
public ZooKeeperWrapper getZooKeeperWrapper() {
return zooKeeperWrapper;
}
/**
* The HRegionServer sticks in this loop until closed. It repeatedly checks
* in with the HMaster, sending heartbeats & reports, and receiving HRegion
* load/unload instructions.
*/
public void run() {
regionServerThread = Thread.currentThread();
boolean quiesceRequested = false;
try {
init(reportForDuty());
@ -600,8 +675,11 @@ public class HRegionServer implements HConstants, HRegionInterface,
}
join();
if (shutdownHDFS.get()) {
runThread(this.hdfsShutdownThread,
this.conf.getLong("hbase.dfs.shutdown.wait", 30000));
}
LOG.info(Thread.currentThread().getName() + " exiting");
}

3
src/test/org/apache/hadoop/hbase/MiniHBaseCluster.java
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@ -110,8 +110,7 @@ public class MiniHBaseCluster implements HConstants {
* @param serverNumber Used as index into a list.
*/
public void abortRegionServer(int serverNumber) {
HRegionServer server =
this.hbaseCluster.getRegionServers().get(serverNumber).getRegionServer();
HRegionServer server = getRegionServer(serverNumber);
LOG.info("Aborting " + server.getServerInfo().toString());
server.abort();
}

43
src/test/org/apache/hadoop/hbase/TestZooKeeper.java
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@ -21,10 +21,14 @@ package org.apache.hadoop.hbase;
import java.io.IOException;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.client.HConnection;
import org.apache.hadoop.hbase.client.HConnectionManager;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.io.BatchUpdate;
import org.apache.hadoop.hbase.master.HMaster;
import org.apache.hadoop.hbase.regionserver.HRegionServer;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
@ -106,4 +110,43 @@ public class TestZooKeeper extends HBaseClusterTestCase {
System.err.println("ZooKeeper should have timed out");
connection.relocateRegion(HConstants.ROOT_TABLE_NAME, HConstants.EMPTY_BYTE_ARRAY);
}
/**
*
*/
public void testRegionServerSessionExpired() {
try {
new HTable(conf, HConstants.META_TABLE_NAME);
String quorumServers = zooKeeperCluster.getQuorumServers();
int sessionTimeout = conf.getInt("zookeeper.session.timeout", 2 * 1000);
Watcher watcher = new EmptyWatcher();
HRegionServer rs = cluster.getRegionServer(0);
ZooKeeperWrapper rsZK = rs.getZooKeeperWrapper();
long sessionID = rsZK.getSessionID();
byte[] password = rsZK.getSessionPassword();
ZooKeeper zk = new ZooKeeper(quorumServers, sessionTimeout, watcher, sessionID, password);
zk.close();
Thread.sleep(sessionTimeout * 3);
new HTable(conf, HConstants.META_TABLE_NAME);
HBaseAdmin admin = new HBaseAdmin(conf);
HTableDescriptor desc = new HTableDescriptor("test");
HColumnDescriptor family = new HColumnDescriptor("fam:");
desc.addFamily(family);
admin.createTable(desc);
HTable table = new HTable("test");
BatchUpdate batchUpdate = new BatchUpdate("testrow");
batchUpdate.put("fam:col", Bytes.toBytes("testdata"));
table.commit(batchUpdate);
} catch (Exception e) {
e.printStackTrace();
fail();
}
}
}