Aaron T. Myers created HDFS-5922:
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Summary: DN heartbeat thread can get stuck in tight loop
Key: HDFS-5922
URL: https://issues.apache.org/jira/browse/HDFS-5922
Project: Hadoop HDFS
Issue Type: Bug
Components: datanode
Affects Versions: 2.3.0
Reporter: Aaron T. Myers
We saw an issue recently on a test cluster where one of the DN threads was
consuming 100% of a single CPU. Running jstack indicated that it was the DN
heartbeat thread. I believe I've tracked down the cause to a bug in the
accounting around the value of {{pendingReceivedRequests}}.
More details in the first comment.
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