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https://issues.apache.org/jira/browse/HADOOP-13738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15592804#comment-15592804
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Arpit Agarwal commented on HADOOP-13738:
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Thanks for the feedback [~kihwal].
bq. Any particular reason why it retries on FNFE? When do you think that will
happen?
The retry on FNFE handles the very unlikely situation of file name collision
while creating the FileOutputStream. e.g. due to simultaneous checks or a
previously existing file which cannot be deleted.
> 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
>
>
> 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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