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From "Wade Simmons (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-757) FatClient removal causes ConcurrentModificationException
Date Fri, 16 Jul 2010 20:36:50 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12889310#action_12889310
] 

Wade Simmons commented on CASSANDRA-757:
----------------------------------------

This is a more serious bug than originally thought due to CASSANDRA-1289. When this exception
gets thrown, it causes GossipTimerTask to stop running until the server is restarted. Because
of this, I would recommend a backport to 0.6.x (I'll offer to do the backport as well). 

> FatClient removal causes ConcurrentModificationException
> --------------------------------------------------------
>
>                 Key: CASSANDRA-757
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-757
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.5
>         Environment: debian lenny amd64 OpenJDK 64-Bit Server VM (build 1.6.0_0-b11,
mixed mode)
>            Reporter: Brandon Williams
>            Assignee: Brandon Williams
>            Priority: Minor
>             Fix For: 0.7
>
>         Attachments: 0001_use_concurrent_structures.txt
>
>
> After using a fatclient and killing it, I later receive this ST on all nodes:
>  INFO 16:04:58,999 FatClient /10.242.4.13 has been silent for 3600000ms, removing from
gossip
> ERROR 16:04:58,999 Fatal exception in thread Thread[Timer-1,5,main]
> java.lang.RuntimeException: java.util.ConcurrentModificationException
>         at org.apache.cassandra.gms.Gossiper$GossipTimerTask.run(Gossiper.java:96)
>         at java.util.TimerThread.mainLoop(Timer.java:534)
>         at java.util.TimerThread.run(Timer.java:484)
> Caused by: java.util.ConcurrentModificationException
>         at java.util.Hashtable$Enumerator.next(Hashtable.java:1048)
>         at org.apache.cassandra.gms.Gossiper.doStatusCheck(Gossiper.java:382)
>         at org.apache.cassandra.gms.Gossiper$GossipTimerTask.run(Gossiper.java:90)
>         ... 2 more

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