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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5677) RM should transition to standby when connection is lost for an extended period
Date Tue, 13 Dec 2016 21:25:59 GMT

    [ https://issues.apache.org/jira/browse/YARN-5677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15746313#comment-15746313

Junping Du commented on YARN-5677:

It sounds like this patch is pushed into branch-2.8. Adding it to fix version.

> RM should transition to standby when connection is lost for an extended period
> ------------------------------------------------------------------------------
>                 Key: YARN-5677
>                 URL: https://issues.apache.org/jira/browse/YARN-5677
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.8.0
>            Reporter: Daniel Templeton
>            Assignee: Daniel Templeton
>            Priority: Critical
>             Fix For: 2.8.0, 2.9.0, 3.0.0-alpha2
>         Attachments: YARN-5677.001.patch, YARN-5677.002.patch, YARN-5677.003.patch, YARN-5677.004.patch,
YARN-5677.005.patch, YARN-5677.branch-2.001.patch
> In trunk, there is no maximum number of retries that I see.  It appears the connection
will be retried forever, with the active never figuring out it's no longer active.  In my
testing, the active-active state lasted almost 2 hours with no sign of stopping before I killed
it.  The solution appears to be to cap the number of retries or amount of time spent retrying.
> This issue is significant because of the asynchronous nature of job submission.  If the
active doesn't know it's not active, it will buffer up job submissions until it finally realizes
it has become the standby. Then it will fail all the job submissions in bulk. In high-volume
workflows, that behavior can create huge mass job failures.
> This issue is also important because the node managers will not fail over to the new
active until the old active realizes it's the standby.  Workloads submitted after the old
active loses contact with ZK will therefore fail to be executed regardless of which RM the
clients contact.

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