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Posted to hdfs-dev@hadoop.apache.org by "Inigo Goiri (JIRA)" <ji...@apache.org> on 2016/03/06 23:04:40 UTC

[jira] [Resolved] (HDFS-9910) Datanode heartbeats can get blocked by disk in FsDatasetImpl#checkBlock()

     [ 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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