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https://issues.apache.org/jira/browse/YARN-9198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16742077#comment-16742077
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Wilfred Spiegelenburg commented on YARN-9198:
---------------------------------------------
As I [commented in the previous
jira|https://issues.apache.org/jira/browse/YARN-7913?focusedCommentId=16483490&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16483490]:
the CS and FS work differently and this can happen due to a number of reasons.
ACL changes or a change in queue configuration is one of those. Just removing a
running application on restore is not correct. It really breaks the restore as
you can now not rely on the restore to pull back all running application on a
fail over. We need to go back and fix the underlying issue around the queues
and config.
BTW: The CS forces you to roll back the configuration change and make sure that
it always works. That might be a solution but with the FS doing queue
management in a more dynamic way that might not work.
> Corrupted state from a previous version can still cause RM to fail with NPE
> on FairScheduler
> --------------------------------------------------------------------------------------------
>
> Key: YARN-9198
> URL: https://issues.apache.org/jira/browse/YARN-9198
> Project: Hadoop YARN
> Issue Type: Bug
> Components: fairscheduler, resourcemanager
> Affects Versions: 3.1.0, 2.8.5
> Reporter: Dapeng Sun
> Assignee: Dapeng Sun
> Priority: Major
> Attachments: YARN-9198.001.patch
>
>
> Previously, RM may fail with NPE due to YARN-4347,YARN-4000. After these
> fixes, FairScheduler still has the same potential issue.
>
> 201x-xx-xx xx:xx:xx,xxx ERROR resourcemanager.ResourceManager
> (ResourceManager.java:serviceStart) - Failed to load/recover state
> java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.addApplicationAttempt(FairScheduler.java)
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