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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4840) ReplicationMonitor and FSEditLogLoader get NPE during shutdown
Date Wed, 22 May 2013 18:15:22 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13664367#comment-13664367
] 

Aaron T. Myers commented on HDFS-4840:
--------------------------------------

I've also seen this fail recently during a run of TestListCorruptFileBlocks, here: https://builds.apache.org/job/PreCommit-HDFS-Build/4420//testReport/org.apache.hadoop.hdfs.server.namenode/TestListCorruptFileBlocks/testListCorruptFileBlocksInSafeMode/

Stack trace:

{noformat}
2013-05-21 15:48:06,280 FATAL blockmanagement.BlockManager (BlockManager.java:run(3101)) -
ReplicationMonitor thread received Runtime exception. 
java.lang.NullPointerException
	at org.apache.hadoop.hdfs.server.blockmanagement.BlocksMap.getBlockCollection(BlocksMap.java:77)
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWorkForBlocks(BlockManager.java:1155)
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWork(BlockManager.java:1130)
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeDatanodeWork(BlockManager.java:3132)
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$ReplicationMonitor.run(BlockManager.java:3094)
	at java.lang.Thread.run(Thread.java:662)
{noformat}
                
> ReplicationMonitor and FSEditLogLoader get NPE during shutdown
> --------------------------------------------------------------
>
>                 Key: HDFS-4840
>                 URL: https://issues.apache.org/jira/browse/HDFS-4840
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 3.0.0
>            Reporter: Kihwal Lee
>
> TestBlocksWithNotEnoughRacks occasionally fails during test tear down because RaplicationMonitor
gets NPE.
> Seen at https://builds.apache.org/job/Hadoop-Hdfs-trunk/1406/.

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