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https://issues.apache.org/jira/browse/YARN-5694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15629737#comment-15629737
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Jian He edited comment on YARN-5694 at 11/2/16 5:32 PM:
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sorry, I don't quite get it. why is the active thread needed to run in non-HA
mode ?
Even in HA mode, it may not be needed, because the curator leader election
library can automatically detect whether the RM is still active and send
notification. IIUC, no need a separate thread to detect that
was (Author: jianhe):
sorry, I don't quite get it. why is the active thread needed to run in non-HA
mode ?
Even in HA mode, it may not be needed, because the curator library can
automatically detect whether the RM is still active and send notification.
IIUC, no need a separate thread to detect that
> ZKRMStateStore should always start its verification thread to prevent
> accidental state store corruption
> -------------------------------------------------------------------------------------------------------
>
> Key: YARN-5694
> URL: https://issues.apache.org/jira/browse/YARN-5694
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 3.0.0-alpha1
> Reporter: Daniel Templeton
> Assignee: Daniel Templeton
> Priority: Critical
> Labels: oct16-medium
> Attachments: YARN-5694.001.patch, YARN-5694.002.patch,
> YARN-5694.003.patch, YARN-5694.004.patch, YARN-5694.004.patch,
> YARN-5694.005.patch, YARN-5694.006.patch, YARN-5694.007.patch,
> YARN-5694.branch-2.7.001.patch, YARN-5694.branch-2.7.002.patch
>
>
> There are two cases. In branch-2.7, the
> {{ZKRMStateStore.VerifyActiveStatusThread}} is always started, even when
> using embedded or Curator failover. In branch-2.8, the
> {{ZKRMStateStore.VerifyActiveStatusThread}} is only started when HA is
> disabled, which makes no sense. Based on the JIRA that introduced that
> change (YARN-4559), I believe the intent was to start it only when embedded
> failover is disabled.
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