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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-8018) Yarn service: Add support for initiating service upgrade
Date Thu, 15 Mar 2018 21:22:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16401130#comment-16401130
] 

Eric Yang commented on YARN-8018:
---------------------------------

[~csingh] RM rest API is multi-threaded.  There is no guarantee that request will be handled
via ServiceClient in ordered fashion.  It would be best to have a memory queue of size of
n (default to 1) in AM for queuing the requests, and commit service definition after flex
is completed.  If AM goes down, then AM recovery will use the last copy on HDFS.  User will
need to resubmit the upgrade request again if there was something in the memory queue prior
to AM crash.  This will also prevent getting stuck in queued request.  This also reduce complexity
of logic that we run in RM.

> 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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