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https://issues.apache.org/jira/browse/YARN-90?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14158643#comment-14158643
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Ming Ma commented on YARN-90:
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Thanks, Varun.
The main question about UNHEALTHY state is whether this patch might make it
more likely for a node to become unhealthy given "full disk" has been added as
one of the conditions. Given [~jira.shegalov]'s YARN-1996 and [~sjlee0]'s
MAPREDUCE-5817 have suggestions to mitigate the impact of UNHEALTHY nodes on
existing containers and MR task scheduling, this might not be an issue.
Nit: For "Set<String> postCheckFullDirs = new HashSet<String>(fullDirs);". It
doesn't have to create postCheckFullDirs. It can directly refer to fullDirs
later.
> 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
> Assignee: Varun Vasudev
> Attachments: YARN-90.1.patch, YARN-90.patch, YARN-90.patch,
> YARN-90.patch, YARN-90.patch, apache-yarn-90.0.patch, apache-yarn-90.1.patch,
> apache-yarn-90.2.patch, apache-yarn-90.3.patch, apache-yarn-90.4.patch,
> apache-yarn-90.5.patch, apache-yarn-90.6.patch, apache-yarn-90.7.patch,
> apache-yarn-90.8.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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