Vinay created HDFS-5368:
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Summary: Namenode deadlock during safemode extention
Key: HDFS-5368
URL: https://issues.apache.org/jira/browse/HDFS-5368
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Vinay
Assignee: Vinay
Priority: Blocker
Namenode entered to safemode during restart
1. After restart NN entered to safemode extention.
2. During this time deadlock happened between datanode heartbeat and
SafemodeMonitor() thread.
{normat}Found one Java-level deadlock:
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"org.apache.hadoop.hdfs.server.namenode.FSNamesystem$SafeModeMonitor@9fe953":
waiting to lock monitor 0x18c3b42c (object 0x0439c6f8, a java.util.TreeMap),
which is held by "IPC Server handler 2 on 62212"
"IPC Server handler 2 on 62212":
waiting to lock monitor 0x18c3987c (object 0x043849a0, a
org.apache.hadoop.hdfs.server.namenode.FSNamesystem$SafeModeInfo),
which is held by
"org.apache.hadoop.hdfs.server.namenode.FSNamesystem$SafeModeMonitor@9fe953"{noformat}
Check attached jstack for complete stack
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