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From "Tom Byrne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CURATOR-172) Deadlock when performing background operation
Date Tue, 16 Dec 2014 18:55:14 GMT

    [ https://issues.apache.org/jira/browse/CURATOR-172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14248677#comment-14248677
] 

Tom Byrne commented on CURATOR-172:
-----------------------------------

Happened again last night. Same stack trace in the CuratorFramework, but different holdups
in the other threads. I didn't get an actual jstack, this was culled from an hprof that happened
when we hit an OutOfMemory - we were accepting requests in the front end and backing up behind
ZK. Once we had accumulated too much, we OOM'd.


SECOND ONE
 CuratorFramework-0 tid=21 [WAITING] [DAEMON]
java.lang.Object.wait(long) Object.java
java.lang.Object.wait() Object.java:503
org.apache.zookeeper.ClientCnxn.submitRequest(RequestHeader, Record, Record, ZooKeeper$WatchRegistration)
ClientCnxn.java:1309
org.apache.zookeeper.ClientCnxn.close() ClientCnxn.java:1281
org.apache.zookeeper.ZooKeeper.close() ZooKeeper.java:677
org.apache.curator.HandleHolder.internalClose() HandleHolder.java:139
org.apache.curator.HandleHolder.closeAndReset() HandleHolder.java:77
org.apache.curator.ConnectionState.reset() ConnectionState.java:218
org.apache.curator.ConnectionState.checkTimeouts() ConnectionState.java:194
org.apache.curator.ConnectionState.getZooKeeper() ConnectionState.java:88
org.apache.curator.CuratorZookeeperClient.getZooKeeper() CuratorZookeeperClient.java:115
org.apache.curator.framework.imps.CuratorFrameworkImpl.performBackgroundOperation(OperationAndData)
CuratorFrameworkImpl.java:763
org.apache.curator.framework.imps.CuratorFrameworkImpl.backgroundOperationsLoop() CuratorFrameworkImpl.java:749
org.apache.curator.framework.imps.CuratorFrameworkImpl.access$300(CuratorFrameworkImpl) CuratorFrameworkImpl.java:56
org.apache.curator.framework.imps.CuratorFrameworkImpl$3.call() CuratorFrameworkImpl.java:244
java.util.concurrent.FutureTask$Sync.innerRun() FutureTask.java:334
java.util.concurrent.FutureTask.run() FutureTask.java:166
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor$Worker) ThreadPoolExecutor.java:1110
java.util.concurrent.ThreadPoolExecutor$Worker.run() ThreadPoolExecutor.java:603
java.lang.Thread.run() Thread.java:722

 ContainerStateSupervisor-1 tid=156 [BLOCKED] [DAEMON]
org.apache.curator.ConnectionState.checkTimeouts() ConnectionState.java:177
org.apache.curator.ConnectionState.getZooKeeper() ConnectionState.java:88
org.apache.curator.CuratorZookeeperClient.getZooKeeper() CuratorZookeeperClient.java:115
org.apache.curator.framework.imps.CuratorFrameworkImpl.getZooKeeper() CuratorFrameworkImpl.java:457
org.apache.curator.framework.imps.GetChildrenBuilderImpl$3.call() GetChildrenBuilderImpl.java:214
org.apache.curator.framework.imps.GetChildrenBuilderImpl$3.call() GetChildrenBuilderImpl.java:203
org.apache.curator.RetryLoop.callWithRetry(CuratorZookeeperClient, Callable) RetryLoop.java:107
org.apache.curator.framework.imps.GetChildrenBuilderImpl.pathInForeground(String) GetChildrenBuilderImpl.java:200
org.apache.curator.framework.imps.GetChildrenBuilderImpl.forPath(String) GetChildrenBuilderImpl.java:191
org.apache.curator.framework.imps.GetChildrenBuilderImpl.forPath(String) GetChildrenBuilderImpl.java:38
MYPACKAGE-REDACTED.repair.AbandonedContainerTracker.getAbandonedContainers(int) AbandonedContainerTracker.java:119
MYPACKAGE-REDACTED.jobs.ContainerStateSupervisor.closeAndConfirmAbandonedContainers() ContainerStateSupervisor.java:81
MYPACKAGE-REDACTED.jobs.ContainerStateSupervisor.runOneIteration() ContainerStateSupervisor.java:72
com.google.common.util.concurrent.AbstractScheduledService$1$1.run() AbstractScheduledService.java:170
java.util.concurrent.Executors$RunnableAdapter.call() Executors.java:471
java.util.concurrent.FutureTask$Sync.innerRunAndReset() FutureTask.java:351
java.util.concurrent.FutureTask.runAndReset() FutureTask.java:178
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor$ScheduledFutureTask)
ScheduledThreadPoolExecutor.java:178
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run() ScheduledThreadPoolExecutor.java:293
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor$Worker) ThreadPoolExecutor.java:1110
java.util.concurrent.ThreadPoolExecutor$Worker.run() ThreadPoolExecutor.java:603
java.lang.Thread.run() Thread.java:722


 StatisticsJob-1 tid=99 [WAITING] [DAEMON]
java.lang.Object.wait(long) Object.java
java.lang.Object.wait() Object.java:503
org.apache.zookeeper.ClientCnxn.submitRequest(RequestHeader, Record, Record, ZooKeeper$WatchRegistration)
ClientCnxn.java:1309
org.apache.zookeeper.ZooKeeper.setData(String, byte[], int) ZooKeeper.java:1264
org.apache.curator.framework.imps.SetDataBuilderImpl$4.call() SetDataBuilderImpl.java:260
org.apache.curator.framework.imps.SetDataBuilderImpl$4.call() SetDataBuilderImpl.java:256
org.apache.curator.RetryLoop.callWithRetry(CuratorZookeeperClient, Callable) RetryLoop.java:107
org.apache.curator.framework.imps.SetDataBuilderImpl.pathInForeground(String, byte[]) SetDataBuilderImpl.java:253
org.apache.curator.framework.imps.SetDataBuilderImpl.forPath(String, byte[]) SetDataBuilderImpl.java:239
org.apache.curator.framework.imps.SetDataBuilderImpl.forPath(String, byte[]) SetDataBuilderImpl.java:39
MYPACKAGE-REDACTED.jobs.StatisticsJob.saveCounters() StatisticsJob.java:114
MYPACKAGE-REDACTED.StatisticsJob.runOneIteration() StatisticsJob.java:98
com.google.common.util.concurrent.AbstractScheduledService$1$1.run() AbstractScheduledService.java:170
java.util.concurrent.Executors$RunnableAdapter.call() Executors.java:471
java.util.concurrent.FutureTask$Sync.innerRunAndReset() FutureTask.java:351
java.util.concurrent.FutureTask.runAndReset() FutureTask.java:178
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor$ScheduledFutureTask)
ScheduledThreadPoolExecutor.java:178
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run() ScheduledThreadPoolExecutor.java:293
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor$Worker) ThreadPoolExecutor.java:1110
java.util.concurrent.ThreadPoolExecutor$Worker.run() ThreadPoolExecutor.java:603
java.lang.Thread.run() Thread.java:722


> 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
>
> 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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