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From "Milind Bhandarkar (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5404) GenericOptionsParser should parse generic options even if they appear after Tool-specific options
Date Fri, 13 Mar 2009 19:26:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12681869#action_12681869
] 

Milind Bhandarkar commented on HADOOP-5404:
-------------------------------------------

In addition, multiple -files options fail. Thus,

-files file1,file2 works

but

-files file1 -files file2 does not.

-files should be similar to -D, which can be used multiple times. Haven't checked -archives
and -libjars. But they too, should be allowed multiple times.

> GenericOptionsParser should parse generic options even if they appear after Tool-specific
options
> -------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-5404
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5404
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: util
>    Affects Versions: 0.19.1
>         Environment: All
>            Reporter: Milind Bhandarkar
>
> Currently, when GenericOptionsParser encounters an unrecognized option, it stops processing
command-line arguments, and returns the rest to the specific Tool. This forces users to remember
the order of arguments, and leads to errors such as following:
> org.apache.commons.cli.UnrecognizedOptionException: Unrecognized option:
> -Dmapred.reduce.tasks=4
>         at org.apache.commons.cli.Parser.processOption(Parser.java:368)
>         at org.apache.commons.cli.Parser.parse(Parser.java:185)
>         at org.apache.commons.cli.Parser.parse(Parser.java:70)
>         at
> MyTool.run(MyTool.java.java:290)
>         at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
>         at
> MyTool.main(MyTool.java:19)
> In Hadoop-streaming as well, -D parameters should appear before streaming-specific arguments,
such as -mapper, -reducer etc.
> If GenericOptionsParser were to scan the entire command-line, ignoring unrecognized (tool-specific)
options, and returning all unrecognized options back to the tool, this problem would be solved.

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