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Posted to dev@curator.apache.org by "Michael Morello (JIRA)" <ji...@apache.org> on 2013/08/02 15:27:49 UTC
[jira] [Commented] (CURATOR-45) LeaderSelector threw exception, but
still created ephemeral node, breaking everything
[ https://issues.apache.org/jira/browse/CURATOR-45?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13727674#comment-13727674 ]
Michael Morello commented on CURATOR-45:
----------------------------------------
I can reproduce the issue in a unit test, i'm working on a fix.
Basically If the retry policy expires before the session and in the mean time the connection is back then the ephemeral node is never deleted.
The tricky part is that we don't know the name of the znode that has been created so i think we have to use the UUID created by the withProtection(), keep it in memory and when the connection is back do the clean up.
> LeaderSelector threw exception, but still created ephemeral node, breaking everything
> -------------------------------------------------------------------------------------
>
> Key: CURATOR-45
> URL: https://issues.apache.org/jira/browse/CURATOR-45
> Project: Apache Curator
> Issue Type: Bug
> Reporter: Shevek
> Assignee: Jordan Zimmerman
>
> ZooKeeper hiccupped, and then this happened:
> 2013-06-19 02:23:35,561 DEBUG [LeaderSelector-1] com.netflix.curator.RetryLoop.takeException (RetryLoop.java:184) - Retry-able exception received
> org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /[REMOVED]/election/_c_1ccdb2b9-7f9a-4570-9555-201c91ec2dcb-lock-
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:99) ~[zookeeper-3.5.0.jar:3.5.0--1]
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:51) ~[zookeeper-3.5.0.jar:3.5.0--1]
> at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:876) ~[zookeeper-3.5.0.jar:3.5.0--1]
> at com.netflix.curator.framework.imps.CreateBuilderImpl$10.call(CreateBuilderImpl.java:625) ~[curator-framework-1.3.5-SNAPSHOT.jar:?]
> at com.netflix.curator.framework.imps.CreateBuilderImpl$10.call(CreateBuilderImpl.java:609) ~[curator-framework-1.3.5-SNAPSHOT.jar:?]
> at com.netflix.curator.RetryLoop.callWithRetry(RetryLoop.java:106) [curator-client-1.3.5-SNAPSHOT.jar:?]
> at com.netflix.curator.framework.imps.CreateBuilderImpl.pathInForeground(CreateBuilderImpl.java:605) [curator-framework-1.3.5-SNAPSHOT.jar:?]
> at com.netflix.curator.framework.imps.CreateBuilderImpl.forPath(CreateBuilderImpl.java:428) [curator-framework-1.3.5-SNAPSHOT.jar:?]
> at com.netflix.curator.framework.imps.CreateBuilderImpl.forPath(CreateBuilderImpl.java:41) [curator-framework-1.3.5-SNAPSHOT.jar:?]
> at com.netflix.curator.framework.recipes.locks.LockInternals.attemptLock(LockInternals.java:218) [curator-recipes-1.3.5-SNAPSHOT.jar:?]
> at com.netflix.curator.framework.recipes.locks.InterProcessMutex.internalLock(InterProcessMutex.java:218) [curator-recipes-1.3.5-SNAPSHOT.jar:?]
> at com.netflix.curator.framework.recipes.locks.InterProcessMutex.acquire(InterProcessMutex.java:74) [curator-recipes-1.3.5-SNAPSHOT.jar:?]
> at com.netflix.curator.framework.recipes.leader.LeaderSelector.doWork(LeaderSelector.java:314) [curator-recipes-1.3.5-SNAPSHOT.jar:?]
> at com.netflix.curator.framework.recipes.leader.LeaderSelector.doWorkLoop(LeaderSelector.java:373) [curator-recipes-1.3.5-SNAPSHOT.jar:?]
> at com.netflix.curator.framework.recipes.leader.LeaderSelector.access$100(LeaderSelector.java:46) [curator-recipes-1.3.5-SNAPSHOT.jar:?]
> at com.netflix.curator.framework.recipes.leader.LeaderSelector$2.call(LeaderSelector.java:195) [curator-recipes-1.3.5-SNAPSHOT.jar:?]
> at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) [?:1.6.0_27]
> at java.util.concurrent.FutureTask.run(FutureTask.java:166) [?:1.6.0_27]
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146) [?:1.6.0_27]
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [?:1.6.0_27]
> at java.lang.Thread.run(Thread.java:679) [?:1.6.0_27]
> However, the ephemeral node got created, and this hung leader election for this path.
> I'm investigating to work out where to put an extra guaranteed-delete. I see the case in LockInternals, which sometimes triggers to do this cleanup, but it didn't trigger in this case.
> You must really love our bugs by now.
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