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https://issues.apache.org/jira/browse/HBASE-5166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214912#comment-13214912
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Hadoop QA commented on HBASE-5166:
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-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12515764/5166-v9.txt
against trunk revision .
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 3 new or modified tests.
-1 javadoc. The javadoc tool appears to have generated -134 warning
messages.
+1 javac. The applied patch does not increase the total number of javac
compiler warnings.
-1 findbugs. The patch appears to introduce 153 new Findbugs (version
1.3.9) warnings.
+1 release audit. The applied patch does not increase the total number of
release audit warnings.
-1 core tests. The patch failed these unit tests:
org.apache.hadoop.hbase.mapreduce.TestHFileOutputFormat
org.apache.hadoop.hbase.mapred.TestTableMapReduce
org.apache.hadoop.hbase.mapreduce.TestImportTsv
Test results:
https://builds.apache.org/job/PreCommit-HBASE-Build/1024//testReport/
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/1024//artifact/trunk/patchprocess/newPatchFindbugsWarnings.html
Console output:
https://builds.apache.org/job/PreCommit-HBASE-Build/1024//console
This message is automatically generated.
> 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,
> 0008-HBASE-5166-Added-MultithreadedTableMapper.patch, 5166-v9.txt
>
> 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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