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From "Hua Liu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-9901) Move block validation out of the heartbeat thread
Date Fri, 04 Mar 2016 06:26:40 GMT
Hua Liu created HDFS-9901:

             Summary: Move block validation out of the heartbeat thread
                 Key: HDFS-9901
                 URL: https://issues.apache.org/jira/browse/HDFS-9901
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: datanode
            Reporter: Hua Liu
            Assignee: Hua Liu
            Priority: Minor

During heavy disk IO, we noticed hearbeat thread hangs on checkBlock method, which checks
the existence and length of a block before spins off a thread to do the actual transferring.
In extreme cases, the heartbeat thread hang more than 10 minutes so the namenode marked the
datanode as dead and started replicating its blocks, which caused more disk IO on other nodes
and can potentially brought them down.

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