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From "Nigel Daley (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3141) periodic ConcurrentModificationException in IPC Server
Date Mon, 31 Mar 2008 21:58:24 GMT
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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