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From "Jordan Zimmerman (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CURATOR-45) LeaderSelector threw exception, but still created ephemeral node, breaking everything
Date Fri, 06 Sep 2013 05:31:54 GMT

     [ https://issues.apache.org/jira/browse/CURATOR-45?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jordan Zimmerman updated CURATOR-45:
------------------------------------

    Fix Version/s:     (was: TBD)
                   waiting-bin
    
> 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
>          Components: Framework, Recipes
>    Affects Versions: 2.2.0-incubating
>            Reporter: Shevek
>            Assignee: Jordan Zimmerman
>             Fix For: waiting-bin
>
>         Attachments: CURATOR-45.patch
>
>
> 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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