[jira] [Updated] (HDFS-8694) Expose the stats of IOErrors on each FsVolume through JMX

["Lei (Eddy) Xu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-8694?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lei (Eddy) Xu updated HDFS-8694:
--------------------------------
    Attachment: HDFS-8694.001.patch

Updated the patch to fix {{TestDataTransferKeepalive}}, the other failed unit tests were passed locally on my machine. 

Not sure about the timed out tests. So upload this patch to test again.

> 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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