Jiandan Yang created HDFS-12638:
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Summary: NameNode exit due to NPE
Key: HDFS-12638
URL: https://issues.apache.org/jira/browse/HDFS-12638
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs
Affects Versions: 2.8.2
Reporter: Jiandan Yang
Active NamNode exit due to NPE, and I think BlockCollection 'bc' is Null by
exclusion, but I do not know why bc is Null, By view history I guess this issue
may be involved by [HDFS-9754|https://issues.apache.org/jira/browse/HDFS-9754].
NN logs are as following:
{code:java}
2017-10-11 16:29:06,161 ERROR [ReplicationMonitor]
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: ReplicationMonitor
thread received Runtime exception.
java.lang.NullPointerException
at
org.apache.hadoop.hdfs.server.blockmanagement.ReplicationWork.chooseTargets(ReplicationWork.java:55)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWorkForBlocks(BlockManager.java:1532)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWork(BlockManager.java:1491)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeDatanodeWork(BlockManager.java:3792)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$ReplicationMonitor.run(BlockManager.java:3744)
at java.lang.Thread.run(Thread.java:834)
{code}
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