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https://issues.apache.org/jira/browse/MAPREDUCE-3889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13215097#comment-13215097
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Thomas Graves commented on MAPREDUCE-3889:
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{quote}
What is the impact of this? Is it crashing the client? Seems like it from the
code, in which case we'll need to fix it.
{quote}
This is not crashing the client. It just prints the 400 message out on the
client if they had a failed task (by default) or task with status by what they
set -Dmapreduce.client.output.filter to.
400 message look like:
12/02/18 21:32:12 WARN mapreduce.Job: Error reading task output Server returned
HTTP response code: 400 for URL:
http://nodemanager:8080/tasklog?plaintext=true&attemptid=attempt_1329857083014_0003_r_000000_0&filter=stdout
So as far as I can tell its benign - just possibly confusing to the user and
its not actually giving them any of the log information for failed tasks.
> job client tries to use /tasklog interface, but that doesn't exist anymore
> --------------------------------------------------------------------------
>
> Key: MAPREDUCE-3889
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3889
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.1
> Reporter: Thomas Graves
> Priority: Critical
>
> if you specify -Dmapreduce.client.output.filter=SUCCEEDED option when
> running a job it tries to fetch task logs to print out on the client side
> from a url like:
> http://nodemanager:8080/tasklog?plaintext=true&attemptid=attempt_1329857083014_0003_r_000000_0&filter=stdout
> It always errors on this request with: Required param job, map and reduce
> We saw this error when using distcp and the distcp failed. I'm not sure if it
> is mandatory for distcp or just informational purposes. I'm guessing the
> latter.
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