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From "Hua Liu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-9901) Move block validation out of the heartbeat thread
Date Wed, 09 Mar 2016 21:14:40 GMT

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

Hua Liu updated HDFS-9901:
    Status: Patch Available  (was: In Progress)

> 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
>         Attachments: 0001-HDFS-9901-Move-block-validation-out-of-the-heartbeat.patch
> 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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