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From "jiraposter@reviews.apache.org (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5166) MultiThreaded Table Mapper analogous to MultiThreaded Mapper in hadoop
Date Thu, 23 Feb 2012 04:17:56 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214284#comment-13214284
] 

jiraposter@reviews.apache.org commented on HBASE-5166:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/3995/
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(Updated 2012-02-23 04:17:08.702062)


Review request for hbase, Ted Yu and Michael Stack.


Changes
-------

changes as suggested in review


Summary
-------

There is no MultiThreadedTableMapper in hbase currently just like we have a MultiThreadedMapper
in Hadoop for IO Bound Jobs. 
UseCase, webcrawler: take input (urls) from a hbase table and put the content (urls, content)
back into hbase. 
Running these kind of hbase mapreduce job with normal table mapper is quite slow as we are
not utilizing CPU fully (N/W IO Bound).

Moreover, I want to know whether It would be a good/bad idea to use HBase for these kind of
usecases ?.


Diffs (updated)
-----

  /src/main/java/org/apache/hadoop/hbase/mapreduce/MultithreadedTableMapper.java PRE-CREATION

  /src/test/java/org/apache/hadoop/hbase/mapreduce/TestMulitthreadedTableMapper.java PRE-CREATION


Diff: https://reviews.apache.org/r/3995/diff


Testing
-------


Thanks,

Jai


                
> MultiThreaded Table Mapper analogous to MultiThreaded Mapper in hadoop
> ----------------------------------------------------------------------
>
>                 Key: HBASE-5166
>                 URL: https://issues.apache.org/jira/browse/HBASE-5166
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Jai Kumar Singh
>            Priority: Minor
>              Labels: multithreaded, tablemapper
>         Attachments: 0001-Added-MultithreadedTableMapper-HBASE-5166.patch, 0003-Added-MultithreadedTableMapper-HBASE-5166.patch,
0005-HBASE-5166-Added-MultithreadedTableMapper.patch, 0006-HBASE-5166-Added-MultithreadedTableMapper.patch
>
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
>
> There is no MultiThreadedTableMapper in hbase currently just like we have a MultiThreadedMapper
in Hadoop for IO Bound Jobs. 
> UseCase, webcrawler: take input (urls) from a hbase table and put the content (urls,
content) back into hbase. 
> Running these kind of hbase mapreduce job with normal table mapper is quite slow as we
are not utilizing CPU fully (N/W IO Bound).
> Moreover, I want to know whether It would be a good/bad idea to use HBase for these kind
of usecases ?. 

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