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https://issues.apache.org/jira/browse/HBASE-5166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13213240#comment-13213240
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Jai Kumar Singh commented on HBASE-5166:
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@Zhihong Yu: submitted the patch for review with the suggested changes.
For the sub prefix, I've taken this from hadoop and following the same. Reason
why we are calling it SubMapRecordReader/Writer because it is intermediate
RecordReader/Writer for Mapper Threads and It eventually uses
RecordReader/Writer passed to MapReduce Job to do actual read/write.
Thanks,
PS: I tried adding "Zhihong" in the reviewer list on the review page but
somehow RB was failing, So I added stack as reviewer. Please do review.
> 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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