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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1136) exception in UnderReplicatedBlocks:add when ther are more replicas of a block than required
Date Tue, 20 Mar 2007 17:06:32 GMT
exception in UnderReplicatedBlocks:add when ther are more replicas of a block than required
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                 Key: HADOOP-1136
                 URL: https://issues.apache.org/jira/browse/HADOOP-1136
             Project: Hadoop
          Issue Type: Bug
            Reporter: dhruba borthakur
         Assigned To: Hairong Kuang


I was running a random writer followed by a sort when I saw this condition:

Exception in thread "org.apache.hadoop.dfs.FSNamesystem$ReplicationMonitor@187814" java.lang.ArrayIndexOutOfBoundsException:
3
        at org.apache.hadoop.dfs.FSNamesystem$UnderReplicatedBlocks.add(FSNamesystem.java:447)
        at org.apache.hadoop.dfs.FSNamesystem$UnderReplicatedBlocks.add(FSNamesystem.java:464)
        at org.apache.hadoop.dfs.FSNamesystem.processPendingReplications(FSNamesystem.java:1891)
        at org.apache.hadoop.dfs.FSNamesystem$ReplicationMonitor.run(FSNamesystem.java:1795)
        at java.lang.Thread.run(Thread.java:619)

processPendingReplications is invoking neededReplications.add().  The add method then invokes
add(block, 3, 4). This add method calls getPriority and that returns 3. Now, the call to priorityQueues[3].add()
throws an OutOfBoundsException.

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