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From "Radim Kolar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3772) MultipleOutputs output lost if baseOutputPath starts with ../
Date Tue, 27 Nov 2012 00:28:58 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13504262#comment-13504262
] 

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

With slight code modification MultipleOutputs can write to any file. Just write to temporary
directory as usual but after task is done, you can overwrite any file. Just create mapping
table between temporary file and final name.
                
> 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: mrv1
>    Affects Versions: 0.20.203.0, 0.22.0
>         Environment: FreeBSD
>            Reporter: Radim Kolar
>
> 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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