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From "Radim Kolar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3772) MultipleOutputs output lost if baseOutputPath starts with ../
Date Thu, 29 Nov 2012 19:30:59 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13506706#comment-13506706
] 

Radim Kolar commented on MAPREDUCE-3772:
----------------------------------------

write into temporary file and save into Jobconf mapping temporary file = real file if this
an absolute path.
                
> 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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