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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3141) periodic ConcurrentModificationException in IPC Server
Date Mon, 31 Mar 2008 22:26:30 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12583909#action_12583909
] 

Raghu Angadi commented on HADOOP-3141:
--------------------------------------

I think this should be fixed in 0.16.3. It does look scary to the user though for now it does
not do any harm.

> periodic ConcurrentModificationException in IPC Server
> ------------------------------------------------------
>
>                 Key: HADOOP-3141
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3141
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: ipc
>    Affects Versions: 0.16.1
>            Reporter: Nigel Daley
>
> Seeing this exception in the Namenode log (429 of them yesterday alone)
> 2008-03-30 00:00:32,332 WARN org.apache.hadoop.ipc.Server: Exception in Responder java.util.ConcurrentModificationException
>         at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
>         at java.util.HashMap$KeyIterator.next(HashMap.java:827)
>         at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
>         at org.apache.hadoop.ipc.Server$Responder.run(Server.java:475)

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