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https://issues.apache.org/jira/browse/FLINK-20249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17238147#comment-17238147
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Ruguo Yu edited comment on FLINK-20249 at 11/24/20, 2:00 PM:
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Thank you for sharing these messages [~fly_in_gis] [~xintongsong] [~trohrmann]
It seems that internal service is still necessary in non-HA mode.
In my experiment, job is always scheduled on new TMs pod because of point two
by [~xintongsong], however the root cause is point one (Although I don’t fully
understand). so if point one can be resolved, that is, prioritize reuse of old
TMs instead of starting new ones, then internal service can paly real income,
Is that right?
was (Author: jiang7chengzitc):
Thank you for sharing these messages [~fly_in_gis] [~xintongsong] [~trohrmann]
It seems that internal service is still necessary in non-HA mode.
In my experiment, job is always scheduled on new TMs pod because of point two
by [~xintongsong], however the root cause is point one (Although I don’t fully
understand). so if point one can be resolved, that is, prioritize reuse of old
TMs instead of starting new ones, then internal service can paly real income,
Is that right?
> Rethink the necessity of the k8s internal Service even in non-HA mode
> ---------------------------------------------------------------------
>
> Key: FLINK-20249
> URL: https://issues.apache.org/jira/browse/FLINK-20249
> Project: Flink
> Issue Type: Improvement
> Components: Deployment / Kubernetes
> Affects Versions: 1.11.0
> Reporter: Ruguo Yu
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.12.0
>
> Attachments: k8s internal service - in english.pdf, k8s internal
> service - v2.pdf, k8s internal service.pdf
>
>
> In non-HA mode, k8s will create internal service that directs the
> communication from TaskManagers Pod to JobManager Pod, and TM Pods could
> re-register to the new JM Pod once a JM Pod failover occurs.
> However recently I do an experiment and find a problem that k8s will first
> create new TM pods and then destory old TM pods after a period of time once
> JM Pod failover (note: new JM podIP has changed), then job will be reschedule
> by JM on new TM pods, it means new TM has been registered to JM.
> During this process, internal service is active all the time, but I think it
> is not necessary that keep this internal service, In other words, wo can weed
> out internal service and use JM podIP for TM pods communication with JM pod,
> In this case, it be consistent with HA mode.
> Finally，related experiments is in attached (k8s internal service.pdf).
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