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Posted to hdfs-dev@hadoop.apache.org by "Kihwal Lee (JIRA)" <ji...@apache.org> on 2015/08/31 16:34:46 UTC

[jira] [Created] (HDFS-8995) Flaw in registration bookeeping can make DN die on reconnect

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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