Apache
/
hbase
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

HBASE-3016 Refactor zk logging in trunk; do less and and identifier to log messages to help debugging 

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@998555 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael Stack 2010-09-18 21:56:37 +00:00
parent 2dfce22970
commit 467a0e726d
7 changed files with 131 additions and 157 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
conf/log4j.properties
View File

@ -44,3 +44,5 @@ log4j.logger.org.apache.zookeeper=INFO
#log4j.logger.org.apache.hadoop.fs.FSNamesystem=DEBUG
log4j.logger.org.apache.hadoop.hbase=DEBUG
#log4j.logger.org.apache.hadoop.dfs=DEBUG
# Set this class to log INFO only otherwise its OTT
log4j.logger.org.apache.hadoop.hbase.zookeeper.ZKUtil=INFO

5
src/main/java/org/apache/hadoop/hbase/client/HConnectionManager.java
View File

@ -917,10 +917,7 @@ public class HConnectionManager {
throws ZooKeeperConnectionException {
if(zooKeeper == null) {
try {
this.zooKeeper = new ZooKeeperWatcher(conf,
ZKUtil.getZooKeeperClusterKey(conf), this);
LOG.debug("zkw created, sessionid=0x" +
Long.toHexString(this.zooKeeper.getZooKeeper().getSessionId()));
this.zooKeeper = new ZooKeeperWatcher(conf, "hconnection", this);
} catch (IOException e) {
throw new ZooKeeperConnectionException(e);
}

2
src/main/java/org/apache/hadoop/hbase/master/ActiveMasterManager.java
View File

@ -184,7 +184,7 @@ class ActiveMasterManager extends ZooKeeperListener {
ZKUtil.deleteNode(watcher, watcher.masterAddressZNode);
}
} catch (KeeperException e) {
watcher.error("Error deleting our own master address node", e);
LOG.error(this.watcher.prefix("Error deleting our own master address node"), e);
}
}
}

2
src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
View File

@ -1172,8 +1172,6 @@ public class HRegionServer implements HRegionInterface, HBaseRPCErrorHandler,
// Start Server. This service is like leases in that it internally runs
// a thread.
this.server.start();
LOG.info("HRegionServer started at: "
+ this.serverInfo.getServerAddress().toString());
}
/*

71
src/main/java/org/apache/hadoop/hbase/zookeeper/ZKAssign.java
View File

@ -19,6 +19,8 @@
*/
package org.apache.hadoop.hbase.zookeeper;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.executor.RegionTransitionData;
import org.apache.hadoop.hbase.executor.EventHandler.EventType;
@ -83,6 +85,7 @@ import org.apache.zookeeper.data.Stat;
* </ol>
*/
public class ZKAssign {
private static final Log LOG = LogFactory.getLog(ZKAssign.class);
/**
* Gets the full path node name for the unassigned node for the specified
@ -132,8 +135,8 @@ public class ZKAssign {
public static void createNodeOffline(ZooKeeperWatcher zkw, HRegionInfo region,
String serverName, final EventType event)
throws KeeperException, KeeperException.NodeExistsException {
zkw.debug("Creating an unassigned node for " + region.getEncodedName() +
" in an OFFLINE state");
LOG.debug(zkw.prefix("Creating an unassigned node for " +
region.getEncodedName() + " in an OFFLINE state"));
RegionTransitionData data = new RegionTransitionData(event,
region.getRegionName(), serverName);
synchronized(zkw.getNodes()) {
@ -164,8 +167,8 @@ public class ZKAssign {
public static void forceNodeOffline(ZooKeeperWatcher zkw, HRegionInfo region,
String serverName)
throws KeeperException, KeeperException.NoNodeException {
zkw.debug("Forcing an existing unassigned node for " +
region.getEncodedName() + " to an OFFLINE state");
LOG.debug(zkw.prefix("Forcing an existing unassigned node for " +
region.getEncodedName() + " to an OFFLINE state"));
RegionTransitionData data = new RegionTransitionData(
EventType.M2ZK_REGION_OFFLINE, region.getRegionName(), serverName);
synchronized(zkw.getNodes()) {
@ -197,8 +200,8 @@ public class ZKAssign {
public static boolean createOrForceNodeOffline(ZooKeeperWatcher zkw,
HRegionInfo region, String serverName)
throws KeeperException {
zkw.debug("Creating or updating an unassigned node for " +
region.getEncodedName() + " with an OFFLINE state");
LOG.debug(zkw.prefix("Creating or updating an unassigned node for " +
region.getEncodedName() + " with an OFFLINE state"));
RegionTransitionData data = new RegionTransitionData(
EventType.M2ZK_REGION_OFFLINE, region.getRegionName(), serverName);
synchronized(zkw.getNodes()) {
@ -316,8 +319,8 @@ public class ZKAssign {
private static boolean deleteNode(ZooKeeperWatcher zkw, String regionName,
EventType expectedState)
throws KeeperException, KeeperException.NoNodeException {
zkw.debug("Deleting an existing unassigned node for " + regionName +
" that is in expected state " + expectedState);
LOG.debug(zkw.prefix("Deleting an existing unassigned " +
"node for " + regionName + " that is in expected state " + expectedState));
String node = getNodeName(zkw, regionName);
Stat stat = new Stat();
byte [] bytes = ZKUtil.getDataNoWatch(zkw, node, stat);
@ -326,17 +329,19 @@ public class ZKAssign {
}
RegionTransitionData data = RegionTransitionData.fromBytes(bytes);
if(!data.getEventType().equals(expectedState)) {
zkw.warn("Attempting to delete an unassigned node in " + expectedState +
" state but node is in " + data.getEventType() + " state");
LOG.warn(zkw.prefix("Attempting to delete an unassigned " +
"node in " + expectedState +
" state but node is in " + data.getEventType() + " state"));
return false;
}
synchronized(zkw.getNodes()) {
// TODO: Does this go here or only if we successfully delete node?
zkw.getNodes().remove(node);
if(!ZKUtil.deleteNode(zkw, node, stat.getVersion())) {
zkw.warn("Attempting to delete an unassigned node in " + expectedState +
LOG.warn(zkw.prefix("Attempting to delete an " +
"unassigned node in " + expectedState +
" state but " +
"after verifying it was in OPENED state, we got a version mismatch");
"after verifying it was in OPENED state, we got a version mismatch"));
return false;
}
return true;
@ -356,7 +361,7 @@ public class ZKAssign {
*/
public static void deleteAllNodes(ZooKeeperWatcher zkw)
throws KeeperException {
zkw.debug("Deleting any existing unassigned nodes");
LOG.debug(zkw.prefix("Deleting any existing unassigned nodes"));
ZKUtil.deleteChildrenRecursively(zkw, zkw.assignmentZNode);
}
@ -387,8 +392,8 @@ public class ZKAssign {
public static int createNodeClosing(ZooKeeperWatcher zkw, HRegionInfo region,
String serverName)
throws KeeperException, KeeperException.NodeExistsException {
zkw.debug("Creating an unassigned node for " + region.getEncodedName() +
" in a CLOSING state");
LOG.debug(zkw.prefix("Creating an unassigned node for " +
region.getEncodedName() + " in a CLOSING state"));
RegionTransitionData data = new RegionTransitionData(
EventType.RS2ZK_REGION_CLOSING, region.getRegionName(), serverName);
synchronized(zkw.getNodes()) {
@ -574,10 +579,10 @@ public class ZKAssign {
int expectedVersion)
throws KeeperException {
String encoded = region.getEncodedName();
if(zkw.isDebugEnabled()) {
zkw.debug("Attempting to transition node " +
if(LOG.isDebugEnabled()) {
LOG.debug(zkw.prefix("Attempting to transition node " +
HRegionInfo.prettyPrint(encoded) +
" from " + beginState.toString() + " to " + endState.toString());
" from " + beginState.toString() + " to " + endState.toString()));
}
String node = getNodeName(zkw, encoded);
@ -591,18 +596,20 @@ public class ZKAssign {
// Verify it is the expected version
if(expectedVersion != -1 && stat.getVersion() != expectedVersion) {
zkw.warn("Attempt to transition the unassigned node for " + encoded +
" from " + beginState + " to " + endState + " failed, " +
"the node existed but was version " + stat.getVersion() +
" not the expected version " + expectedVersion);
LOG.warn(zkw.prefix("Attempt to transition the " +
"unassigned node for " + encoded +
" from " + beginState + " to " + endState + " failed, " +
"the node existed but was version " + stat.getVersion() +
" not the expected version " + expectedVersion));
return -1;
}
// Verify it is in expected state
if(!existingData.getEventType().equals(beginState)) {
zkw.warn("Attempt to transition the unassigned node for " + encoded +
LOG.warn(zkw.prefix("Attempt to transition the " +
"unassigned node for " + encoded +
" from " + beginState + " to " + endState + " failed, " +
"the node existed but was in the state " + existingData.getEventType());
"the node existed but was in the state " + existingData.getEventType()));
return -1;
}
@ -611,22 +618,24 @@ public class ZKAssign {
RegionTransitionData data = new RegionTransitionData(endState,
region.getRegionName(), serverName);
if(!ZKUtil.setData(zkw, node, data.getBytes(), stat.getVersion())) {
zkw.warn("Attempt to transition the unassigned node for " + encoded +
LOG.warn(zkw.prefix("Attempt to transition the " +
"unassigned node for " + encoded +
" from " + beginState + " to " + endState + " failed, " +
"the node existed and was in the expected state but then when " +
"setting data we got a version mismatch");
"setting data we got a version mismatch"));
return -1;
}
if(zkw.isDebugEnabled()) {
zkw.debug("Successfully transitioned node " + encoded +
" from " + beginState + " to " + endState);
if(LOG.isDebugEnabled()) {
LOG.debug(zkw.prefix("Successfully transitioned node " + encoded +
" from " + beginState + " to " + endState));
}
return stat.getVersion() + 1;
} catch (KeeperException.NoNodeException nne) {
zkw.warn("Attempt to transition the unassigned node for " + encoded +
LOG.warn(zkw.prefix("Attempt to transition the " +
"unassigned node for " + encoded +
" from " + beginState + " to " + endState + " failed, " +
"the node existed and was in the expected state but then when " +
"setting data it no longer existed");
"setting data it no longer existed"));
return -1;
}
}

77
src/main/java/org/apache/hadoop/hbase/zookeeper/ZKUtil.java
View File

@ -79,12 +79,19 @@ public class ZKUtil {
public static ZooKeeper connect(Configuration conf, String quorum,
Watcher watcher)
throws IOException {
return connect(conf, quorum, watcher, "");
}
public static ZooKeeper connect(Configuration conf, String quorum,
Watcher watcher, final String descriptor)
throws IOException {
if(quorum == null) {
throw new IOException("Unable to determine ZooKeeper quorum");
}
int timeout = conf.getInt("zookeeper.session.timeout", 60 * 1000);
LOG.debug("Opening connection to ZooKeeper with quorum (" + quorum + ")");
LOG.info(descriptor + " opening connection to ZooKeeper with quorum (" +
quorum + ")");
return new ZooKeeper(quorum, timeout, watcher);
}
@ -186,14 +193,14 @@ public class ZKUtil {
throws KeeperException {
try {
Stat s = zkw.getZooKeeper().exists(znode, zkw);
zkw.debug("Set watcher on existing znode " + znode);
LOG.info(zkw.prefix("Set watcher on existing znode " + znode));
return s != null ? true : false;
} catch (KeeperException e) {
zkw.warn("Unable to set watcher on znode " + znode, e);
LOG.warn(zkw.prefix("Unable to set watcher on znode " + znode), e);
zkw.keeperException(e);
return false;
} catch (InterruptedException e) {
zkw.warn("Unable to set watcher on znode " + znode, e);
LOG.warn(zkw.prefix("Unable to set watcher on znode " + znode), e);
zkw.interruptedException(e);
return false;
}
@ -216,11 +223,11 @@ public class ZKUtil {
Stat s = zkw.getZooKeeper().exists(znode, null);
return s != null ? s.getVersion() : -1;
} catch (KeeperException e) {
zkw.warn("Unable to set watcher on znode (" + znode + ")", e);
LOG.warn(zkw.prefix("Unable to set watcher on znode (" + znode + ")"), e);
zkw.keeperException(e);
return -1;
} catch (InterruptedException e) {
zkw.warn("Unable to set watcher on znode (" + znode + ")", e);
LOG.warn(zkw.prefix("Unable to set watcher on znode (" + znode + ")"), e);
zkw.interruptedException(e);
return -1;
}
@ -253,15 +260,15 @@ public class ZKUtil {
List<String> children = zkw.getZooKeeper().getChildren(znode, zkw);
return children;
} catch(KeeperException.NoNodeException ke) {
zkw.debug("Unable to list children of znode " + znode + " " +
"because node does not exist (not an error)");
LOG.debug(zkw.prefix("Unable to list children of znode " + znode + " " +
"because node does not exist (not an error)"));
return null;
} catch (KeeperException e) {
zkw.warn("Unable to list children of znode " + znode + " ", e);
LOG.warn(zkw.prefix("Unable to list children of znode " + znode + " "), e);
zkw.keeperException(e);
return null;
} catch (InterruptedException e) {
zkw.warn("Unable to list children of znode " + znode + " ", e);
LOG.warn(zkw.prefix("Unable to list children of znode " + znode + " "), e);
zkw.interruptedException(e);
return null;
}
@ -397,15 +404,15 @@ public class ZKUtil {
try {
return !zkw.getZooKeeper().getChildren(znode, null).isEmpty();
} catch(KeeperException.NoNodeException ke) {
zkw.debug("Unable to list children of znode " + znode + " " +
"because node does not exist (not an error)");
LOG.debug(zkw.prefix("Unable to list children of znode " + znode + " " +
"because node does not exist (not an error)"));
return false;
} catch (KeeperException e) {
zkw.warn("Unable to list children of znode " + znode, e);
LOG.warn(zkw.prefix("Unable to list children of znode " + znode), e);
zkw.keeperException(e);
return false;
} catch (InterruptedException e) {
zkw.warn("Unable to list children of znode " + znode, e);
LOG.warn(zkw.prefix("Unable to list children of znode " + znode), e);
zkw.interruptedException(e);
return false;
}
@ -430,7 +437,7 @@ public class ZKUtil {
Stat stat = zkw.getZooKeeper().exists(znode, null);
return stat == null ? 0 : stat.getNumChildren();
} catch(KeeperException e) {
zkw.warn("Unable to get children of node " + znode);
LOG.warn(zkw.prefix("Unable to get children of node " + znode));
zkw.keeperException(e);
} catch(InterruptedException e) {
zkw.interruptedException(e);
@ -450,18 +457,19 @@ public class ZKUtil {
throws KeeperException {
try {
byte [] data = zkw.getZooKeeper().getData(znode, null, null);
zkw.debug("Retrieved " + data.length + " bytes of data from znode " + znode);
LOG.debug(zkw.prefix("Retrieved " + data.length +
" bytes of data from znode " + znode));
return data;
} catch (KeeperException.NoNodeException e) {
zkw.debug("Unable to get data of znode " + znode + " " +
"because node does not exist (not an error)");
LOG.debug(zkw.prefix("Unable to get data of znode " + znode + " " +
"because node does not exist (not an error)"));
return null;
} catch (KeeperException e) {
zkw.warn("Unable to get data of znode " + znode, e);
LOG.warn(zkw.prefix("Unable to get data of znode " + znode), e);
zkw.keeperException(e);
return null;
} catch (InterruptedException e) {
zkw.warn("Unable to get data of znode " + znode, e);
LOG.warn(zkw.prefix("Unable to get data of znode " + znode), e);
zkw.interruptedException(e);
return null;
}
@ -482,19 +490,19 @@ public class ZKUtil {
throws KeeperException {
try {
byte [] data = zkw.getZooKeeper().getData(znode, zkw, null);
zkw.debug("Retrieved " + data.length + " bytes of data from znode " +
znode + " and set a watcher");
LOG.debug(zkw.prefix("Retrieved " + data.length +
" bytes of data from znode " + znode + " and set a watcher"));
return data;
} catch (KeeperException.NoNodeException e) {
zkw.debug("Unable to get data of znode " + znode + " " +
"because node does not exist (not an error)");
LOG.debug(zkw.prefix("Unable to get data of znode " + znode + " " +
"because node does not exist (not an error)"));
return null;
} catch (KeeperException e) {
zkw.warn("Unable to get data of znode " + znode, e);
LOG.warn(zkw.prefix("Unable to get data of znode " + znode), e);
zkw.keeperException(e);
return null;
} catch (InterruptedException e) {
zkw.warn("Unable to get data of znode " + znode, e);
LOG.warn(zkw.prefix("Unable to get data of znode " + znode), e);
zkw.interruptedException(e);
return null;
}
@ -520,18 +528,19 @@ public class ZKUtil {
throws KeeperException {
try {
byte [] data = zkw.getZooKeeper().getData(znode, zkw, stat);
zkw.debug("Retrieved " + data.length + " bytes of data from znode " + znode);
LOG.debug(zkw.prefix("Retrieved " + data.length +
" bytes of data from znode " + znode));
return data;
} catch (KeeperException.NoNodeException e) {
zkw.debug("Unable to get data of znode " + znode + " " +
"because node does not exist (not necessarily an error)");
LOG.debug(zkw.prefix("Unable to get data of znode " + znode + " " +
"because node does not exist (not necessarily an error)"));
return null;
} catch (KeeperException e) {
zkw.warn("Unable to get data of znode " + znode, e);
LOG.warn(zkw.prefix("Unable to get data of znode " + znode), e);
zkw.keeperException(e);
return null;
} catch (InterruptedException e) {
zkw.warn("Unable to get data of znode " + znode, e);
LOG.warn(zkw.prefix("Unable to get data of znode " + znode), e);
zkw.interruptedException(e);
return null;
}
@ -558,7 +567,8 @@ public class ZKUtil {
return null;
}
String addrString = Bytes.toString(data);
zkw.debug("Read server address from znode " + znode + ": " + addrString);
LOG.debug(zkw.prefix("Read server address from znode " + znode + ": " +
addrString));
return new HServerAddress(addrString);
}
@ -705,6 +715,7 @@ public class ZKUtil {
return false;
} catch (InterruptedException e) {
LOG.info("Interrupted", e);
Thread.currentThread().interrupt();
}
return true;
}
@ -996,4 +1007,4 @@ public class ZKUtil {
socket.close();
return res.toArray(new String[res.size()]);
}
}
}

129
src/main/java/org/apache/hadoop/hbase/zookeeper/ZooKeeperWatcher.java
View File

@ -42,14 +42,15 @@ import org.apache.zookeeper.ZooKeeper;
* classes which need to be notified of ZooKeeper events must register with
* the local instance of this watcher via {@link #registerListener}.
*
* <p>This class also holds and manages the connection to ZooKeeper. Code to deal
* with connection related events and exceptions are handled here.
* <p>This class also holds and manages the connection to ZooKeeper. Code to
* deal with connection related events and exceptions are handled here.
*/
public class ZooKeeperWatcher implements Watcher {
private static final Log LOG = LogFactory.getLog(ZooKeeperWatcher.class);
// name of this watcher (for logging only)
private String name;
// Identifiier for this watcher (for logging only). Its made of the prefix
// passed on construction and the zookeeper sessionid.
private String identifier;
// zookeeper quorum
private String quorum;
@ -86,17 +87,19 @@ public class ZooKeeperWatcher implements Watcher {
/**
* Instantiate a ZooKeeper connection and watcher.
* @param name name of this watcher, for logging/debug purposes only
* @param descriptor Descriptive string that is added to zookeeper sessionid
* and used as identifier for this instance.
* @throws IOException
*/
public ZooKeeperWatcher(Configuration conf, String name,
public ZooKeeperWatcher(Configuration conf, String descriptor,
Abortable abortable)
throws IOException {
this.name = name;
this.quorum = ZKConfig.getZKQuorumServersString(conf);
this.zooKeeper = ZKUtil.connect(conf, quorum, this);
this.zooKeeper = ZKUtil.connect(conf, quorum, this, descriptor);
// Identifier will get the sessionid appended later below down when we
// handle the syncconnect event.
this.identifier = descriptor;
this.abortable = abortable;
info("Connected to ZooKeeper");
setNodeNames(conf);
try {
// Create all the necessary "directories" of znodes
@ -106,12 +109,26 @@ public class ZooKeeperWatcher implements Watcher {
ZKUtil.createAndFailSilent(this, rsZNode);
ZKUtil.createAndFailSilent(this, tableZNode);
} catch (KeeperException e) {
error("Unexpected KeeperException creating base node", e);
error("Message: " + e.getMessage());
LOG.error(prefix("Unexpected KeeperException creating base node"), e);
throw new IOException(e);
}
}
@Override
public String toString() {
return this.identifier;
}
/**
* Adds this instance's identifier as a prefix to the passed <code>str</code>
* @param str String to amend.
* @return A new string with this instance's identifier as prefix: e.g.
* if passed 'hello world', the returned string could be
*/
public String prefix(final String str) {
return this.toString() + " " + str;
}
/**
* Set the local variable node names using the specified configuration.
*/
@ -164,10 +181,10 @@ public class ZooKeeperWatcher implements Watcher {
*/
@Override
public void process(WatchedEvent event) {
LOG.debug("<" + name + "> Received ZooKeeper Event, " +
LOG.debug(prefix("Received ZooKeeper Event, " +
"type=" + event.getType() + ", " +
"state=" + event.getState() + ", " +
"path=" + event.getPath());
"path=" + event.getPath()));
switch(event.getType()) {
@ -220,20 +237,22 @@ public class ZooKeeperWatcher implements Watcher {
*/
private void connectionEvent(WatchedEvent event) {
switch(event.getState()) {
// SyncConnected is normal, ignore
case SyncConnected:
// Update our identifier. Otherwise ignore.
this.identifier = this.identifier + "-0x" +
Long.toHexString(this.zooKeeper.getSessionId());
LOG.info(this.identifier + " connected");
break;
// Abort the server if Disconnected or Expired
// TODO: Åny reason to handle these two differently?
case Disconnected:
info("Received Disconnected from ZooKeeper, ignoring");
LOG.info(prefix("Received Disconnected from ZooKeeper, ignoring"));
break;
case Expired:
error("Received Expired from ZooKeeper, aborting server");
if(abortable != null) {
abortable.abort("Received Expired from ZooKeeper, aborting server", null);
}
String msg = prefix("Received Expired from ZooKeeper, aborting server");
LOG.error(msg);
if (abortable != null) abortable.abort(msg, null);
break;
}
}
@ -258,7 +277,7 @@ public class ZooKeeperWatcher implements Watcher {
*/
public void keeperException(KeeperException ke)
throws KeeperException {
error("Received unexpected KeeperException, re-throwing exception", ke);
LOG.error(prefix("Received unexpected KeeperException, re-throwing exception"), ke);
throw ke;
}
@ -274,74 +293,12 @@ public class ZooKeeperWatcher implements Watcher {
* @param ie
*/
public void interruptedException(InterruptedException ie) {
debug("Received InterruptedException, doing nothing here", ie);
LOG.debug(prefix("Received InterruptedException, doing nothing here"), ie);
// At least preserver interrupt.
Thread.currentThread().interrupt();
// no-op
}
// Logging methods
/**
* Exposed info logging method so our zookeeper output is named.
* @param string log line
*/
public void info(String string) {
LOG.info("<" + name + "> " + string);
}
/**
* Exposed debug logging method so our zookeeper output is named.
* @param string log line
*/
public void debug(String string) {
LOG.debug("<" + name + "> " + string);
}
/**
* Exposed debug logging method so our zookeeper output is named.
* @param string log line
*/
public void debug(String string, Throwable t) {
LOG.debug("<" + name + "> " + string, t);
}
/**
* Exposed warn logging method so our zookeeper output is named.
* @param string log line
*/
public void warn(String string) {
LOG.warn("<" + name + "> " + string);
}
/**
* Exposed warn logging method so our zookeeper output is named.
* @param string log line
* @param t exception
*/
public void warn(String string, Throwable t) {
LOG.warn("<" + name + "> " + string, t);
}
/**
* Exposed error logging method so our zookeeper output is named.
* @param string log line
*/
public void error(String string) {
LOG.error("<" + name + "> " + string);
}
/**
* Exposed error logging method so our zookeeper output is named.
* @param string log line
* @param t exception
*/
public void error(String string, Throwable t) {
LOG.error("<" + name + "> " + string, t);
}
public boolean isDebugEnabled() {
return LOG.isDebugEnabled();
}
/**
* Close the connection to ZooKeeper.
* @throws InterruptedException
@ -355,4 +312,4 @@ public class ZooKeeperWatcher implements Watcher {
} catch (InterruptedException e) {
}
}
}
}