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https://issues.apache.org/jira/browse/MAPREDUCE-3772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13508169#comment-13508169
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Alejandro Abdelnur commented on MAPREDUCE-3772:
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Radim, if you have speculative execution enabled, any file written by
MultipleOutputs outside of the output dir of the job (where the temp dir
mechanism for output files of tasks is not in place) is at risk of having
incomplete data.
> MultipleOutputs output lost if baseOutputPath starts with ../
> -------------------------------------------------------------
>
> Key: MAPREDUCE-3772
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3772
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: client
> Affects Versions: 0.20.2
> Reporter: Radim Kolar
> Assignee: Harsh J
> Attachments: MAPREDUCE-3772.patch
>
>
> Lets say you have output directory set:
> FileOutputFormat.setOutputPath(job, "/tmp/multi1/out");
> and want to place output from MultipleOutputs into /tmp/multi1/extra
> I expect following code to work:
> mos = new MultipleOutputs<Text, IntWritable>(context);
> mos.write(new Text("zrr"), value, "../extra/");
> but no Exception is throw and expected output directory /tmp/multi1/extra
> does not even exists. All data written to this output vanish without trace.
> To make it work fullpath must be used
> mos.write(new Text("zrr"), value, "/tmp/multi1/extra/");
> Output is listed in statistics from MultipleOutputs correctly:
> org.apache.hadoop.mapreduce.lib.output.MultipleOutputs
> ../gaja1/=13333 (* everything is lost *)
> /tmp/multi1/out/../ksd34/=13333 (* this using full path works
> *)
> list1=6667
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