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Date: Thu, 8 Oct 2009 21:25:31 -0700 (PDT)
From: "Patrick Hunt (JIRA)" <jira@apache.org>
To: zookeeper-dev@hadoop.apache.org
Subject: [jira] Commented: (ZOOKEEPER-512) FLE election fails to elect
 leader
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    [ https://issues.apache.org/jira/browse/ZOOKEEPER-512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12763829#action_12763829 ] 

Patrick Hunt commented on ZOOKEEPER-512:
----------------------------------------

I tried your latest patch with the latest trunk code and I'm not able to reproduce the problem. Looks like this
is addressing the problem.


> FLE election fails to elect leader
> ----------------------------------
>
>                 Key: ZOOKEEPER-512
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-512
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: quorum, server
>    Affects Versions: 3.2.0
>            Reporter: Patrick Hunt
>            Assignee: Flavio Paiva Junqueira
>            Priority: Blocker
>             Fix For: 3.3.0
>
>         Attachments: jst.txt, log3_debug.tar.gz, logs.tar.gz, logs2.tar.gz, t5_aj.tar.gz, ZOOKEEPER-512.patch, ZOOKEEPER-512.patch, ZOOKEEPER-512.patch, ZOOKEEPER-512.patch
>
>
> I was doing some fault injection testing of 3.2.1 with ZOOKEEPER-508 patch applied and noticed that after some time the ensemble failed to re-elect a leader.
> See the attached log files - 5 member ensemble. typically 5 is the leader
> Notice that after 16:23:50,525 no quorum is formed, even after 20 minutes elapses w/no quorum
> environment:
> I was doing fault injection testing using aspectj. The faults are injected into socketchannel read/write, I throw exceptions randomly at a 1/200 ratio (rand.nextFloat() <= .005 => throw IOException
> You can see when a fault is injected in the log via:
> 2009-08-19 16:57:09,568 - INFO  [Thread-74:ReadRequestFailsIntermittently@38] - READPACKET FORCED FAIL
> vs a read/write that didn't force fail:
> 2009-08-19 16:57:09,568 - INFO  [Thread-74:ReadRequestFailsIntermittently@41] - READPACKET OK
> otw standard code/config (straight fle quorum with 5 members)
> also see the attached jstack trace. this is for one of the servers. Notice in particular that the number of sendworkers != the number of recv workers.

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