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https://issues.apache.org/jira/browse/YARN-90?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13810961#comment-13810961
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Hou Song commented on YARN-90:
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Hi guys, I have been using my patch for this issue for a very long time. It
enables NM to reuse failed diskes after they come back, and tt also adds a new
metric of the number of failed directories so people have clearer view from
outside.
For unit tests, I add a test to TestLocalDirsHandlerService, and mimic disk
failure by "chmod 000 failed_dir", and mimic disk repairment by "chmod 000
failed_dir".
If anyone interested, I can post this patch here.
> NodeManager should identify failed disks becoming good back again
> -----------------------------------------------------------------
>
> Key: YARN-90
> URL: https://issues.apache.org/jira/browse/YARN-90
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: nodemanager
> Reporter: Ravi Gummadi
> Attachments: YARN-90.1.patch, YARN-90.patch
>
>
> MAPREDUCE-3121 makes NodeManager identify disk failures. But once a disk goes
> down, it is marked as failed forever. To reuse that disk (after it becomes
> good), NodeManager needs restart. This JIRA is to improve NodeManager to
> reuse good disks(which could be bad some time back).
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