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From "IvyTang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CHUKWA-581) Demux do not support user custom reducer package name.
Date Wed, 17 Jul 2013 06:50:48 GMT

     [ https://issues.apache.org/jira/browse/CHUKWA-581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

IvyTang updated CHUKWA-581:
---------------------------

                 Tags: CustomReducer
        Fix Version/s: 0.5.0
                       0.6.0
               Labels: patch  (was: )
    Affects Version/s: 0.6.0
                       0.5.0
               Status: Patch Available  (was: Open)

The ReduceProcessorFactory inits  the reducer class using the classname "org.apache.hadoop.chukwa.extraction.demux.processor.reducer."+
reduceType.So the reducer class must be put in package org.apache.hadoop.chukwa.extraction.demux.processor.reducer
and named reduceType.

This is not that custom.
So i  chaneg the implementation of ReduceProcessorFactory inits the reducer class ,let the
ReduceProcessorFactory read the reducer class name from chukwa-demux-conf.xml ,like the way
how the MapperProcessorFactory handle the custom mapper class.
So for the users, If you write your own mapper class ClassA and reducer class ClassB. And
you want your DataType1 log be processed by ClassA,and you set the ChukwaRecordKey#ReduceType
to be ReduceType1 in ClassA.process .All you need is setting 
   <property>
    <name>DataType1_mapper</name>
    <value>ClassA's name</value>
    <description></description>
   </property>
    <property>
    <name>ReduceType1_reducer</name>
    <value>ClassB's name</value>
    <description></description>
   </property> 
.The the DataType1 log will be processed by MapperClass ClassA and ReducerClass ClassB.
I 
                
> 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: 0.5.0, 0.4.0, 0.6.0
>         Environment: Ubuntu 10.0.4,Hadoop 0.20
>            Reporter: Yingzhong Xu
>            Assignee: IvyTang
>            Priority: Critical
>              Labels: patch
>             Fix For: 0.6.0, 0.5.0
>
>   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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