HA: Transition to active can cause NN deadlock
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Key: HDFS-2823
URL: https://issues.apache.org/jira/browse/HDFS-2823
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ha, name-node
Affects Versions: HA branch (HDFS-1623)
Reporter: Aaron T. Myers
Assignee: Aaron T. Myers
Priority: Blocker
On transition to active, we have to take the FSNS write lock. In
{{EditLogTailer#stop}}, we interrupt the edit log tailer thread and then join
on that thread. When tailing edits, the edit log tailer thread acquires the
FSNS write lock interruptibly, precisely so that we avoid deadlocks on
transition to active. However, the edit log tailer thread now also triggers
edit log rolls. Several places in {{ipc.Client}} catch and ignore
{{InterruptedException}}, and in so doing may cause the {{Thread#interrupt}}
call to be missed by the edit log tailer thread.
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