[
https://issues.apache.org/jira/browse/HBASE-12394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14204327#comment-14204327
]
Hadoop QA commented on HBASE-12394:
-----------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12680522/HBASE-12394-v4.patch
against trunk revision .
ATTACHMENT ID: 12680522
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:red}-1 tests included{color}. The patch doesn't appear to include
any new or modified tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javadoc{color}. The javadoc tool did not generate any
warning messages.
{color:green}+1 checkstyle{color}. The applied patch does not increase the
total number of checkstyle errors
{color:green}+1 findbugs{color}. The patch does not introduce any new
Findbugs (version 2.0.3) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:green}+1 lineLengths{color}. The patch does not introduce lines
longer than 100
{color:green}+1 site{color}. The mvn site goal succeeds with this patch.
{color:green}+1 core tests{color}. The patch passed unit tests in .
Test results:
https://builds.apache.org/job/PreCommit-HBASE-Build/11624//testReport/
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11624//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11624//artifact/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11624//artifact/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11624//artifact/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11624//artifact/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11624//artifact/patchprocess/newPatchFindbugsWarningshbase-rest.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11624//artifact/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11624//artifact/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11624//artifact/patchprocess/newPatchFindbugsWarningshbase-thrift.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11624//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop2-compat.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11624//artifact/patchprocess/newPatchFindbugsWarningshbase-annotations.html
Checkstyle Errors:
https://builds.apache.org/job/PreCommit-HBASE-Build/11624//artifact/patchprocess/checkstyle-aggregate.html
Console output:
https://builds.apache.org/job/PreCommit-HBASE-Build/11624//console
This message is automatically generated.
> Support multiple regions as input to each mapper in map/reduce jobs
> -------------------------------------------------------------------
>
> Key: HBASE-12394
> URL: https://issues.apache.org/jira/browse/HBASE-12394
> Project: HBase
> Issue Type: Improvement
> Components: mapreduce
> Affects Versions: 2.0.0, 0.98.6.1
> Reporter: Weichen Ye
> Attachments: HBASE-12394-v2.patch, HBASE-12394-v3.patch,
> HBASE-12394-v4.patch, HBASE-12394.patch
>
>
> Welcome to the ReviewBoard :https://reviews.apache.org/r/27519/
> The Latest Patch is "Diff Revision 2 (Latest)"
> For Hadoop cluster, a job with large HBase table as input always consumes a
> large amount of computing resources. For example, we need to create a job
> with 1000 mappers to scan a table with 1000 regions. This patch is to support
> one mapper using multiple regions as input.
> In order to support multiple regions for one mapper, we need a new property
> in configuration--"hbase.mapreduce.scan.regionspermapper"
> hbase.mapreduce.scan.regionspermapper controls how many regions used as input
> for one mapper. For example,if we have an HBase table with 300 regions, and
> we set hbase.mapreduce.scan.regionspermapper = 3. Then we run a job to scan
> the table, the job will use only 300/3=100 mappers.
> In this way, we can control the number of mappers using the following formula.
> Number of Mappers = (Total region numbers) /
> hbase.mapreduce.scan.regionspermapper
> This is an example of the configuration.
> <property>
> <name>hbase.mapreduce.scan.regionspermapper</name>
> <value>3</value>
> </property>
> This is an example for Java code:
> TableMapReduceUtil.initTableMapperJob(tablename, scan, Map.class, Text.class,
> Text.class, job);
>
>
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
