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From "Daniel Templeton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6125) The application attempt's diagnostic message should have a maximum size
Date Fri, 03 Feb 2017 15:05:51 GMT

    [ https://issues.apache.org/jira/browse/YARN-6125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15851600#comment-15851600
] 

Daniel Templeton commented on YARN-6125:
----------------------------------------

My original thought there was something more like:{code}<PREVIOUS MESSAGES DELETED>
message3 this has been one that did not fit totally into the buffer<MESSAGE TAIL TRUNCATED>
message4 the shortest one{code} so that it's extremely clear what happened to the rest of
the message.  In [~andras.piros]'s example above, I think the ellipses fill that role, making
the more explicit tag superfluous.  Are ellipses enough, or would a user be potentially confused?


> The application attempt's diagnostic message should have a maximum size
> -----------------------------------------------------------------------
>
>                 Key: YARN-6125
>                 URL: https://issues.apache.org/jira/browse/YARN-6125
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>    Affects Versions: 2.7.0
>            Reporter: Daniel Templeton
>            Assignee: Andras Piros
>            Priority: Critical
>             Fix For: 3.0.0-alpha3
>
>         Attachments: YARN-6125.000.patch, YARN-6125.001.patch, YARN-6125.002.patch, YARN-6125.003.patch
>
>
> We've found through experience that the diagnostic message can grow unbounded.  I've
seen attempts that have diagnostic messages over 1MB.  Since the message is stored in the
state store, it's a bad idea to allow the message to grow unbounded.  Instead, there should
be a property that sets a maximum size on the message.
> I suspect that some of the ZK state store issues we've seen in the past were due to the
size of the diagnostic messages and not to the size of the classpath, as is the current prevailing
opinion.
> An open question is how best to prune the message once it grows too large.  Should we
> # truncate the tail,
> # truncate the head,
> # truncate the middle,
> # add another property to make the behavior selectable, or
> # none of the above?



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