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https://issues.apache.org/jira/browse/SLIDER-1066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15109484#comment-15109484
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Gour Saha commented on SLIDER-1066:
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If the AM is not restarted the new components will not be recognized by the
currently running AM.
Also since AM code is not upgraded during the application (or rather components
upgrade in this case), why do you think AM will fail? If there is an issue AM
should hit it the very first time itself. Also as part of YARN failover
handling AM can get recycled any time, even if upgrade is not called. If AM
issue is a concern then this will shutdown the entire application as well.
> Make AM restart during upgrade option - e.g. via a option to upgrade command
> ----------------------------------------------------------------------------
>
> Key: SLIDER-1066
> URL: https://issues.apache.org/jira/browse/SLIDER-1066
> Project: Slider
> Issue Type: Improvement
> Affects Versions: Slider 0.80, Slider 0.90.2
> Reporter: Manoj Samel
>
> During "slider upgrade" command e.g. to add a new component; the slider AM
> itself restarts.
> One slide use case is deploy a service via slider and create a new component
> for every new user of service. New components are added via "slider upgrade"
> so existing components (i.e. users) are not impacted by down time. During
> each component upgrade the AM also restarts and all existing components have
> to know the new AM before they can heartbeat to it.
> Per discussions, the AM restart during upgrade is being done to pick up new
> Yarn parameters.
> However, in this use case, Hadoop cluster yarn parameters are not being
> changed; neither are parameters to any of the existing components. Thus the
> AM restart in this case seems to provide no benefit - though it brings a
> small risk that any issue in AM restart will shut down the entire application
> (i.e. impact all running users).
> An option should be provided during the upgrade to NOT do AM restart -
> allowing users of slider to have a choice.
> Filing the improvement Jira per discussion on d-list.
> Thanks,
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