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