Tsz Wo (Nicholas), SZE created HDFS-3846:
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Summary: Namenode deadlock in branch-1
Key: HDFS-3846
URL: https://issues.apache.org/jira/browse/HDFS-3846
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Reporter: Tsz Wo (Nicholas), SZE
Assignee: Brandon Li
Jitendra found out the following problem:
1. Handler : Acquires namesystem lock waits on SafemodeInfo lock at
SafeModeInfo.isOn()
2. SafemodeMonitor : Calls SafeModeInfo.canLeave() which is synchronized so
SafemodeInfo lock is acquired, but this method also causes following call
sequence needEnter() -> getNumLiveDataNodes() -> getNumberOfDatanodes() ->
getDatanodeListForReport() -> getDatanodeListForReport() . The
getDatanodeListForReport is synchronized with FSNamesystem lock.
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