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https://issues.apache.org/jira/browse/CURATOR-172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17684066#comment-17684066
]
Rushabh Shah commented on CURATOR-172:
--------------------------------------
Encountered similar deadlock in our production env.
{noformat}
Found one Java-level deadlock:
=============================
"Curator-Framework-0":
waiting to lock monitor 0x00005601714db280 (object 0x00007f462c96f438, a
java.util.LinkedList),
which is held by "Curator-Framework-0-SendThread(<zk-server>:2181)"
"Curator-Framework-0-SendThread(<zk-server>:2181)":
waiting to lock monitor 0x00007f321e7da400 (object 0x00007f368f014e18, a
org.apache.curator.ConnectionState),
which is held by "Curator-Framework-0"
Java stack information for the threads listed above:
===================================================
"Curator-Framework-0":
at
org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1244)
- waiting to lock <0x00007f462c96f438> (a java.util.LinkedList)
at
org.apache.zookeeper.ClientCnxn$SendThread.cleanAndNotifyState(ClientCnxn.java:1174)
at
org.apache.zookeeper.ClientCnxn$SendThread.access$2300(ClientCnxn.java:700)
at org.apache.zookeeper.ClientCnxn.submitRequest(ClientCnxn.java:1420)
at org.apache.zookeeper.ClientCnxn.close(ClientCnxn.java:1373)
at org.apache.zookeeper.ZooKeeper.close(ZooKeeper.java:788)
- locked <0x00007f462c96e6b0> (a org.apache.zookeeper.ZooKeeper)
at org.apache.curator.HandleHolder.internalClose(HandleHolder.java:139)
at org.apache.curator.HandleHolder.closeAndReset(HandleHolder.java:77)
at org.apache.curator.ConnectionState.reset(ConnectionState.java:217)
- locked <0x00007f368f014e18> (a org.apache.curator.ConnectionState)
at
org.apache.curator.ConnectionState.checkTimeouts(ConnectionState.java:193)
- locked <0x00007f368f014e18> (a org.apache.curator.ConnectionState)
at
org.apache.curator.ConnectionState.getZooKeeper(ConnectionState.java:88)
at
org.apache.curator.CuratorZookeeperClient.getZooKeeper(CuratorZookeeperClient.java:116)
at
org.apache.curator.framework.imps.CuratorFrameworkImpl.performBackgroundOperation(CuratorFrameworkImpl.java:835)
at
org.apache.curator.framework.imps.CuratorFrameworkImpl.backgroundOperationsLoop(CuratorFrameworkImpl.java:809)
at
org.apache.curator.framework.imps.CuratorFrameworkImpl.access$300(CuratorFrameworkImpl.java:64)
at
org.apache.curator.framework.imps.CuratorFrameworkImpl$4.call(CuratorFrameworkImpl.java:267)
at
java.util.concurrent.FutureTask.run([email protected]/FutureTask.java:264)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run([email protected]/ScheduledThreadPoolExecutor.java:304)
at
java.util.concurrent.ThreadPoolExecutor.runWorker([email protected]/ThreadPoolExecutor.java:1128)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run([email protected]/ThreadPoolExecutor.java:628)
at java.lang.Thread.run([email protected]/Thread.java:829)
"Curator-Framework-0-SendThread(hbase1a-mnds5-1-ia2.ops.sfdc.net:2181)":
at
org.apache.curator.ConnectionState.checkTimeouts(ConnectionState.java:176)
- waiting to lock <0x00007f368f014e18> (a
org.apache.curator.ConnectionState)
at
org.apache.curator.ConnectionState.getZooKeeper(ConnectionState.java:88)
at
org.apache.curator.CuratorZookeeperClient.getZooKeeper(CuratorZookeeperClient.java:116)
at
org.apache.curator.framework.imps.CuratorFrameworkImpl.performBackgroundOperation(CuratorFrameworkImpl.java:835)
at
org.apache.curator.framework.imps.CuratorFrameworkImpl.doSyncForSuspendedConnection(CuratorFrameworkImpl.java:701)
at
org.apache.curator.framework.imps.CuratorFrameworkImpl.access$700(CuratorFrameworkImpl.java:64)
at
org.apache.curator.framework.imps.CuratorFrameworkImpl$7.retriesExhausted(CuratorFrameworkImpl.java:697)
at
org.apache.curator.framework.imps.CuratorFrameworkImpl.checkBackgroundRetry(CuratorFrameworkImpl.java:716)
at
org.apache.curator.framework.imps.CuratorFrameworkImpl.processBackgroundOperation(CuratorFrameworkImpl.java:516)
at
org.apache.curator.framework.imps.BackgroundSyncImpl$1.processResult(BackgroundSyncImpl.java:50)
at
org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:611)
at
org.apache.zookeeper.ClientCnxn$EventThread.queuePacket(ClientCnxn.java:462)
- locked <0x00007f462c96f9f8> (a
java.util.concurrent.LinkedBlockingQueue)
at org.apache.zookeeper.ClientCnxn.finishPacket(ClientCnxn.java:632)
at org.apache.zookeeper.ClientCnxn.conLossPacket(ClientCnxn.java:650)
at org.apache.zookeeper.ClientCnxn.access$2100(ClientCnxn.java:94)
at
org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1246)
- locked <0x00007f462c96f438> (a java.util.LinkedList)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1159)
Found 1 deadlock.
{noformat}
We are using very old version of zk: some version of 3.4.13
We are using 2.10.0 curator version.
In the above stack trace I don't see any curator user related code. Can someone
please help?
> Deadlock when performing background operation
> ---------------------------------------------
>
> Key: CURATOR-172
> URL: https://issues.apache.org/jira/browse/CURATOR-172
> Project: Apache Curator
> Issue Type: Bug
> Components: Client
> Affects Versions: 2.4.2
> Environment: Linux HOSTNAME-REMOVED 2.6.32-279.19.1.el6.x86_64 #1 SMP
> Tue Dec 18 15:04:44 PST 2012 x86_64 x86_64 x86_64 GNU/Linux
> java version "1.7.0_60"
> Java(TM) SE Runtime Environment (build 1.7.0_60-b19)
> Java HotSpot(TM) 64-Bit Server VM (build 24.60-b09, mixed mode)
> Reporter: Tom Byrne
> Priority: Major
>
> Had a box get into a state where our ZK connections were all deadlocked,
> waiting on an object monitor. jstack shows that our background thread that
> was creating a node was waiting on a lock that was held by the
> CuratorFramework thread, who was waiting on an object monitor that looks like
> it couldn't be completed until our other write was finished (packet.finish
> would never return true.)
> We have seen this happen twice, but don't notice it until afterwards, and
> don't have enough logging to know what's triggering it (possible ZK
> connections going away?)
> Rest of the box is fine, network connections are not flapping, main IO
> threads continue to accept and process connections, until we get backed up
> waiting for ZK.
> Here are the two stack traces:
> "ZooChangeWatcher-BackgroundReader--2-1-SendThread()" daemon prio=10
> tid=0x00007fcf64108000 nid=0x88d waiting for monitor entry
> [0x00007fcbf5d16000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.curator.ConnectionState.checkTimeouts(ConnectionState.java:177)
> - waiting to lock <0x00000000d526bcc8> (a
> org.apache.curator.ConnectionState)
> at
> org.apache.curator.ConnectionState.getZooKeeper(ConnectionState.java:88)
> at
> org.apache.curator.CuratorZookeeperClient.getZooKeeper(CuratorZookeeperClient.java:115)
> at
> org.apache.curator.framework.imps.CuratorFrameworkImpl.performBackgroundOperation(CuratorFrameworkImpl.java:763)
> at
> org.apache.curator.framework.imps.CuratorFrameworkImpl.processBackgroundOperation(CuratorFrameworkImpl.java:470)
> at
> org.apache.curator.framework.imps.CreateBuilderImpl.pathInBackground(CreateBuilderImpl.java:648)
> at
> org.apache.curator.framework.imps.CreateBuilderImpl.forPath(CreateBuilderImpl.java:427)
> at
> org.apache.curator.framework.imps.CreateBuilderImpl.forPath(CreateBuilderImpl.java:44)
> at
> org.apache.curator.framework.recipes.nodes.PersistentEphemeralNode.createNode(PersistentEphemeralNode.java:340)
> at
> org.apache.curator.framework.recipes.nodes.PersistentEphemeralNode.access$000(PersistentEphemeralNode.java:52)
> at
> org.apache.curator.framework.recipes.nodes.PersistentEphemeralNode$4.processResult(PersistentEphemeralNode.java:224)
> at
> org.apache.curator.framework.imps.CuratorFrameworkImpl.sendToBackgroundCallback(CuratorFrameworkImpl.java:686)
> at
> org.apache.curator.framework.imps.CuratorFrameworkImpl.checkBackgroundRetry(CuratorFrameworkImpl.java:659)
> at
> org.apache.curator.framework.imps.CuratorFrameworkImpl.processBackgroundOperation(CuratorFrameworkImpl.java:479)
> at
> org.apache.curator.framework.imps.CreateBuilderImpl.sendBackgroundResponse(CreateBuilderImpl.java:526)
> at
> org.apache.curator.framework.imps.CreateBuilderImpl.access$600(CreateBuilderImpl.java:44)
> at
> org.apache.curator.framework.imps.CreateBuilderImpl$6.processResult(CreateBuilderImpl.java:485)
> at
> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:602)
> at
> org.apache.zookeeper.ClientCnxn$EventThread.queuePacket(ClientCnxn.java:475)
> - locked <0x00000000fa8e16f8> (a
> java.util.concurrent.LinkedBlockingQueue)
> at org.apache.zookeeper.ClientCnxn.finishPacket(ClientCnxn.java:627)
> at org.apache.zookeeper.ClientCnxn.conLossPacket(ClientCnxn.java:645)
> at org.apache.zookeeper.ClientCnxn.access$2400(ClientCnxn.java:85)
> at
> org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1160)
> - locked <0x00000000fa8e1380> (a java.util.LinkedList)
> at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1109)
> "CuratorFramework-0" daemon prio=10 tid=0x00007fd02cb57800 nid=0x4425 in
> Object.wait() [0x00007fcfc507e000]
> java.lang.Thread.State: WAITING (on object monitor)
> at java.lang.Object.wait(Native Method)
> at java.lang.Object.wait(Object.java:503)
> at org.apache.zookeeper.ClientCnxn.submitRequest(ClientCnxn.java:1309)
> - locked <0x00000000fa8e6750> (a org.apache.zookeeper.ClientCnxn$Packet)
> at org.apache.zookeeper.ClientCnxn.close(ClientCnxn.java:1281)
> at org.apache.zookeeper.ZooKeeper.close(ZooKeeper.java:677)
> - locked <0x00000000fa8e0948> (a org.apache.zookeeper.ZooKeeper)
> at org.apache.curator.HandleHolder.internalClose(HandleHolder.java:139)
> at org.apache.curator.HandleHolder.closeAndReset(HandleHolder.java:77)
> at org.apache.curator.ConnectionState.reset(ConnectionState.java:218)
> - locked <0x00000000d526bcc8> (a org.apache.curator.ConnectionState)
> at
> org.apache.curator.ConnectionState.checkTimeouts(ConnectionState.java:194)
> - locked <0x00000000d526bcc8> (a org.apache.curator.ConnectionState)
> at
> org.apache.curator.ConnectionState.getZooKeeper(ConnectionState.java:88)
> at
> org.apache.curator.CuratorZookeeperClient.getZooKeeper(CuratorZookeeperClient.java:115)
> at
> org.apache.curator.framework.imps.CuratorFrameworkImpl.performBackgroundOperation(CuratorFrameworkImpl.java:763)
> at
> org.apache.curator.framework.imps.CuratorFrameworkImpl.backgroundOperationsLoop(CuratorFrameworkImpl.java:749)
> at
> org.apache.curator.framework.imps.CuratorFrameworkImpl.access$300(CuratorFrameworkImpl.java:56)
> at
> org.apache.curator.framework.imps.CuratorFrameworkImpl$3.call(CuratorFrameworkImpl.java:244)
> at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
> at java.util.concurrent.FutureTask.run(FutureTask.java:166)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
> at java.lang.Thread.run(Thread.java:722)
> Help me Obi-Wan Kenobi, you're my only hope.
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