Jing Zhao created HDFS-3860:
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Summary: HeartbeatManager#Monitor may wrongly hold the writelock
of namesystem
Key: HDFS-3860
URL: https://issues.apache.org/jira/browse/HDFS-3860
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 3.0.0
Reporter: Jing Zhao
Assignee: Jing Zhao
In HeartbeatManager#heartbeatCheck, if some dead datanode is found, the monitor
thread will acquire the write lock of namesystem, and recheck the safemode. If
it is in safemode, the monitor thread will return from the heartbeatCheck
function without release the write lock. This may cause the monitor thread
wrongly holding the write lock forever.
The attached test case tries to simulate this bad scenario.
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