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From "Inigo Goiri (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-9910) Datanode heartbeats can get blocked by disk in FsDatasetImpl#checkBlock()
Date Sun, 06 Mar 2016 22:04:40 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Inigo Goiri resolved HDFS-9910.
-------------------------------
    Resolution: Duplicate

> Datanode heartbeats can get blocked by disk in FsDatasetImpl#checkBlock()
> -------------------------------------------------------------------------
>
>                 Key: HDFS-9910
>                 URL: https://issues.apache.org/jira/browse/HDFS-9910
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 2.7.2
>            Reporter: Inigo Goiri
>            Assignee: Hua Liu
>
> When a data node needs to transfer a block, it validates the block in the heartbeat thread
invoking the {{checkBlock()}} method of {{FsDatasetImpl}}, where it checks whether the block
exists and gets the block length. If the block is valid, it then spins off a thread to do
the actual block transfer. We found that during heavy disk IO the heartbeat thread hangs on
{{replicaInfo.getBlockFile().exists()}} for more than 10 minutes.



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