Kihwal Lee created HDFS-8995:
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Summary: Flaw in registration bookeeping can make DN die on
reconnect
Key: HDFS-8995
URL: https://issues.apache.org/jira/browse/HDFS-8995
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Kihwal Lee
Priority: Critical
Normally data nodes re-register with the namenode when it was unreachable for
more than the heartbeat expiration and becomes reachable again. Datanodes keep
retrying the rpc call such as incremental block report and heartbeat and when
it finally gets through the namenode tells it to re-register.
We have observed some of datanodes stay dead in such scenarios. Further
investigation has revealed that those were told to shutdown by the namenode.
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