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Posted to mapreduce-dev@hadoop.apache.org by "Kai Wei (JIRA)" <ji...@apache.org> on 2013/04/01 05:01:17 UTC

[jira] [Created] (MAPREDUCE-5121) Problem with field separator in FieldSelectionHelper

Kai Wei created MAPREDUCE-5121:
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             Summary: Problem with field separator in FieldSelectionHelper
                 Key: MAPREDUCE-5121
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5121
             Project: Hadoop Map/Reduce
          Issue Type: Bug
    Affects Versions: 1.0.4
            Reporter: Kai Wei
            Assignee: Kai Wei
            Priority: Trivial


I found that org.apache.hadoop.mapreduce.lib.fieldsel.FieldSelectionHelper and the corresponding old api org.apache.hadoop.mapred.lib.FieldSelectionMapReduce take user specified separator string as a regular expression in String.split(), but also use it as a normal string in StringBuffer.append(). It will be a problem if the separator string contains meta character. I suggest take separator literally by calling Pattern.quote(separator). Or just use another property to specify the separator which should be added in the output.

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