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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1312) heartbeat monitor thread goea away
Date Tue, 01 May 2007 23:14:15 GMT
heartbeat monitor thread goea away

                 Key: HADOOP-1312
                 URL: https://issues.apache.org/jira/browse/HADOOP-1312
             Project: Hadoop
          Issue Type: Bug
          Components: dfs
            Reporter: dhruba borthakur

The heartbeat monitor thread encounters a ConcurrentModificationException while iterating
over the "heartbeats" data structure. This occurs when the namenode was getting restarted.
There are actuallt two bugs here:

1. The Heartbeat Monitor thread needs to catch Exceptions and continue, instead of exiting.
2. The heartbeats data structures is protected by the heartbeats lock. The registerDatanode()
method invokes removeDatanode() without acquiring the heartbeats monitor lock. This causes
the ConcurrentModificationException.

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