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https://issues.apache.org/jira/browse/YARN-2240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14049104#comment-14049104
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Vinod Kumar Vavilapalli commented on YARN-2240:
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[~mitdesai], this is interesting. We had seen a bunch of errors that we 
couldn't find the root cause for. Mind pasting the exception messages that you 
see on the client or the error message in the logs?

> yarn logs can get corrupted if the aggregator does not have permissions to 
> the log file it tries to read
> --------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-2240
>                 URL: https://issues.apache.org/jira/browse/YARN-2240
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.5.0
>            Reporter: Mit Desai
>
> When the log aggregator is aggregating the logs, it writes the file length 
> first. Then tries to open the log file and if it does not have permission to 
> do that, it ends up just writing an error message to the aggregated logs.
> The mismatch between the file length and the actual length here makes the 
> aggregated logs corrupted.



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