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From "Miklos Szegedi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7192) Add a pluggable StateMachine Listener that is notified of NM Container State changes
Date Fri, 15 Sep 2017 17:38:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16168238#comment-16168238

Miklos Szegedi commented on YARN-7192:

Thank you [~asuresh] for the updated patch.
bq. Hmm.. it is not technically needed, I just prefer it to having if checks. Do you have
a strong preference against it ?
I do not think it is blocking. A single null check in a function consumes less CPU cycles
than a fetch + call and a ret to a virtual function. There are two cases it can cause a problem.
Code ran very frequently like this may add up and make the overall product slower. It creates
a precedence that others will follow, and it may cause performance issues in other code added
Similarly, I would fix the checkstyle issues. It is much easier to capture and fix new checkstyle
issues later if there are only a few of them in the file at least in some developer environments.
Again, I think this is not blocking either.

> Add a pluggable StateMachine Listener that is notified of NM Container State changes
> ------------------------------------------------------------------------------------
>                 Key: YARN-7192
>                 URL: https://issues.apache.org/jira/browse/YARN-7192
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Arun Suresh
>            Assignee: Arun Suresh
>         Attachments: YARN-7192.001.patch, YARN-7192.002.patch, YARN-7192.003.patch
> This JIRA is to add support for a plugggable class in the NodeManager that is notified
of changes to the Container StateMachine state and the events that caused the change.
> The proposal is to modify the basic StateMachine class add support for a hook that is
called before and after a transition.

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