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https://issues.apache.org/jira/browse/MAPREDUCE-2584?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harsh J updated MAPREDUCE-2584:
-------------------------------
Attachment: MAPREDUCE-2584.r6.diff
Rebased patch for current trunk (had to move the test file around).
Added test fails without fix, passes with fix:
{code}
Running org.apache.hadoop.mapreduce.TestMRJobClient
Tests run: 1, Failures: 0, Errors: 0, Skipped: 1, Time elapsed: 0.03 sec
Results :
Tests run: 1, Failures: 0, Errors: 0, Skipped: 1
{code}
Does anyone have any further comments on this improvement? I believe its
complete and ought to have gone in with HADOOP-7328 but has instead lied stale
for months now, although HADOOP-7328 (a dependency) was put in.
> Check for serializers early, and give out more information regarding missing
> serializers
> ----------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-2584
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2584
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: task
> Affects Versions: 0.20.2
> Reporter: Harsh J
> Assignee: Harsh J
> Labels: serializers, tasks
> Attachments: MAPREDUCE-2584.r2.diff, MAPREDUCE-2584.r3.diff,
> MAPREDUCE-2584.r4.diff, MAPREDUCE-2584.r5.diff, MAPREDUCE-2584.r6.diff
>
>
> As discussed on HADOOP-7328, MapReduce can handle serializers in a much
> better way in case of bad configuration, improper imports (Some odd Text
> class instead of the Writable Text set as key), etc..
> This issue covers the MapReduce parts of the improvements (made to IFile,
> MapOutputBuffer, etc. and possible early-check of serializer availability
> pre-submit) that provide more information than just an NPE as is the current
> case.
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