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From "Lei (Eddy) Xu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8694) Expose the stats of IOErrors on each FsVolume through JMX
Date Sun, 05 Jul 2015 19:28:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14614369#comment-14614369
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Lei (Eddy) Xu commented on HDFS-8694:
-------------------------------------

The failure test {{TestStandbyIsHot}} passed on my local machine. And the checkstyle warnings
are false alarm. 

> Expose the stats of IOErrors on each FsVolume through JMX
> ---------------------------------------------------------
>
>                 Key: HDFS-8694
>                 URL: https://issues.apache.org/jira/browse/HDFS-8694
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode, HDFS
>    Affects Versions: 2.7.0
>            Reporter: Lei (Eddy) Xu
>            Assignee: Lei (Eddy) Xu
>         Attachments: HDFS-8694.000.patch, HDFS-8694.001.patch
>
>
> Currently, once DataNode hits an {{IOError}} when writing / reading block files, it starts
a background {{DiskChecker.checkDirs()}} thread. But if this thread successfully finishes,
DN does not record this {{IOError}}. 
> We need one measurement to count all {{IOErrors}} for each volume.



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