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https://issues.apache.org/jira/browse/YARN-8018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16401051#comment-16401051
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Chandni Singh edited comment on YARN-8018 at 3/15/18 8:58 PM:
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I see an issue with the finalization of upgrade. In my change I introduced
event based state modification to service state. So during finalize the service
master overwrites the service definition when handling the restart event.
However, when flex is trigger, the service definition is overwritten from the
rest server. So service definition is modified by different hosts.
To solve this, we have 2 approaches:
# move overwriting of service definition to AM during flex. Otherwise, this
is a potential problem during processing concurrent flex requests when there
are multiple rest services?
# I change my patch to get rid of event base state handling of service. I
added it because I think this makes handling of auto-finalize much easier and
less prone to bugs.
Any thoughts?
was (Author: csingh):
I see an issue with the finalization of upgrade. In my change I introduced
event based state modification to service state. So during finalize the service
master overwrites the service definition when handling the restart event.
However, when flex is trigger, the service definition is overwritten from the
rest server. So service definition is modified by different hosts.
To solve this, we have 2 approaches:
# move overwriting of service definition to AM during flex.
# I change my patch to get rid of event base state handling of service. I
added it because I think this makes handling of auto-finalize much easier and
less prone to bugs.
Any thoughts?
> Yarn service: Add support for initiating service upgrade
> --------------------------------------------------------
>
> Key: YARN-8018
> URL: https://issues.apache.org/jira/browse/YARN-8018
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Chandni Singh
> Assignee: Chandni Singh
> Priority: Major
> Attachments: YARN-8018.wip.patch
>
>
> Add support for initiating service upgrade which includes the following main
> changes:
> # Service API to initiate upgrade
> # Persist service version on hdfs
> # Start the upgraded version of service
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