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From "Kai Wei (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-5121) Problem with field separator in FieldSelectionHelper
Date Mon, 01 Apr 2013 04:15:15 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5121?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Kai Wei updated MAPREDUCE-5121:

    Status: Patch Available  (was: Open)
> 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
>         Attachments: MAPREDUCE-5121.patch
> 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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