[jira] [Work started] (HDFS-9901) Move block validation out of the heartbeat thread

["Hua Liu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-9901?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HDFS-9901 started by Hua Liu.
-------------------------------------
> 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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