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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CHUKWA-581) Demux do not support user custom reducer package name.
Date Wed, 31 Jul 2013 04:33:48 GMT

    [ https://issues.apache.org/jira/browse/CHUKWA-581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13724858#comment-13724858
] 

Eric Yang commented on CHUKWA-581:
----------------------------------

+1 looks good.
                
> Demux  do not support user custom reducer package name.
> -------------------------------------------------------
>
>                 Key: CHUKWA-581
>                 URL: https://issues.apache.org/jira/browse/CHUKWA-581
>             Project: Chukwa
>          Issue Type: Improvement
>          Components: MR Data Processors
>    Affects Versions: 0.4.0, 0.5.0, 0.6.0
>         Environment: Ubuntu 10.0.4,Hadoop 0.20
>            Reporter: Yingzhong Xu
>            Assignee: IvyTang
>            Priority: Critical
>              Labels: patch
>             Fix For: 0.5.0, 0.6.0
>
>         Attachments: custom_reducer_backwardcompatible.patch, custom_reducer_conf_backwardcompatible.patch
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> In ReduceProcessorFactory.java,
> it only gets {reduceType}.class from this package,as following:
> bq. String path = "org.apache.hadoop.chukwa.extraction.demux.processor.reducer." + reduceType;
> So our custom reducer could only be placed in that package.
> Thus, When we add our {demux}.jar to Hadoop classpath, since the Hadoop framework will
not be able to merge the class files from multiple jar files with the same package name, custom
reduce class can not be found.
> I get a way to overcome this defect.Put custom reducer into a package named with "org.apache.hadoop.chukwa.extraction.demux.processor.reducer."+{custom}
> Here,{custom} is a part of package name.Then in parser,we can write like this:
> bq. Key.setReducerType("{custom}.YourReducer")
> In this way, Hadoop framework could be able to find our reduce class in this partial
user defined new package.
> But I think it will be better to fix chukwa to remove the default package name and fully
support custom package name for reducer.
> Thanks for Eric Yang's help.

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