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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-13738) DiskChecker should perform some disk IO
Date Mon, 24 Oct 2016 23:04:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13738?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arpit Agarwal updated HADOOP-13738:
-----------------------------------
    Attachment: HADOOP-13738.02.patch

v02 patch rebased to trunk. Also made the {{doDiskIo}} method slightly more conservative (it
retries up to three times on any IOException not just FNFE). Added two more tests for the
changed behavior.

> DiskChecker should perform some disk IO
> ---------------------------------------
>
>                 Key: HADOOP-13738
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13738
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>         Attachments: HADOOP-13738.01.patch, HADOOP-13738.02.patch
>
>
> DiskChecker can fail to detect total disk/controller failures indefinitely. We have seen
this in real clusters. DiskChecker performs simple permissions-based checks on directories
which do not guarantee that any disk IO will be attempted.
> A simple improvement is to write some data and flush it to the disk.



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