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https://issues.apache.org/jira/browse/HADOOP-13738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16466748#comment-16466748
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Junping Du commented on HADOOP-13738:
-------------------------------------
Revert it from branch-2.8.4 but keep it on branch-2.8 as I plan to kick off
2.8.4 RC0 today. We can leave the work to 2.8.5.
> 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
> Priority: Major
> Fix For: 2.9.0, 3.0.0-alpha2, 2.8.5
>
> Attachments: HADOOP-13738-branch-2.8-06.patch, HADOOP-13738.01.patch,
> HADOOP-13738.02.patch, HADOOP-13738.03.patch, HADOOP-13738.04.patch,
> HADOOP-13738.05.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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