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Posted to issues@flink.apache.org by "Till Rohrmann (Jira)" <ji...@apache.org> on 2022/01/27 12:03:00 UTC
[jira] [Comment Edited] (FLINK-25849) Differentiate TaskManager sessions when registering at the JobMaster
[ https://issues.apache.org/jira/browse/FLINK-25849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17483088#comment-17483088 ]
Till Rohrmann edited comment on FLINK-25849 at 1/27/22, 12:02 PM:
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I am not sure whether Akka can handle this situation properly. But if this is not a problem, then the address of the TaskExecutor should be enough for the discrimination.
was (Author: till.rohrmann):
I am not sure whether Akka can handle this situation properly.
> Differentiate TaskManager sessions when registering at the JobMaster
> --------------------------------------------------------------------
>
> Key: FLINK-25849
> URL: https://issues.apache.org/jira/browse/FLINK-25849
> Project: Flink
> Issue Type: Sub-task
> Components: Runtime / Coordination
> Affects Versions: 1.15.0
> Reporter: Till Rohrmann
> Assignee: Till Rohrmann
> Priority: Major
> Labels: pull-request-available
>
> With the introduction of configurable {{ResourceID}} for {{TaskManager}} processes, it can happen that a restarted {{TaskManager}} process will be restarted with the same {{ResourceID}}. When it now tries to register at the {{JobMaster}}, the {{JobMaster}} won't recognize it as a new instance because it only compares the {{ResourceID}}. As a consequence, the {{JobMaster}} things that this is a duplicate registration and ignores it.
> It would be better if the {{TaskManager}} would send a session id with the registration that could then be used to decide whether a new instance tries to register at the {{JobMaster}} and, therefore, the old one needs to be disconnected or whether the registration attempt is a duplicate. This would speed up the cluster reconciliation because we would not have to wait for the heartbeat timeout to occur.
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