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https://issues.apache.org/jira/browse/YARN-6125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15870913#comment-15870913
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Daniel Templeton commented on YARN-6125:
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Thanks, [~andras.piros]!  LGTM  +1.  I'll let this sit until tomorrow in case 
anyone else wants to pile on with comments. :)

> 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, YARN-6125.004.patch, 
> YARN-6125.005.patch, YARN-6125.006.patch, YARN-6125.007.patch, 
> YARN-6125.008.patch, YARN-6125.009.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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