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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12394) Support multiple regions as input to each mapper in map/reduce jobs
Date Fri, 31 Oct 2014 12:27:33 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14191741#comment-14191741

Hadoop QA commented on HBASE-12394:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .
  ATTACHMENT ID: 12678452

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 8 new or modified

    {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:red}-1 lineLengths{color}.  The patch introduces the following lines longer than
    +   * See {@link org.apache.hadoop.hbase.mapreduce.TableMultiRegionMapReduceUtil#convertScanToString(org.apache.hadoop.hbase.client.Scan)}
for more details.
+   * Overrides previous calls to {@link org.apache.hadoop.hbase.client.Scan#addColumn(byte[],
byte[])}for any families in the
+     String regionPerMapper =context.getConfiguration().get("hbase.mapreduce.scan.regionspermapper","1");
+         LOG.error("ERROR when parseInt: hbase.mapreduce.scan.regionspermapper must be an
integer ");
+        int stopRegion=(i*regionPerMapperInt+regionPerMapperInt-1<keys.getFirst().length)?(i*regionPerMapperInt+regionPerMapperInt-1):(keys.getFirst().length-1);
+            InetSocketAddress isa = new InetSocketAddress(location.getHostname(), location.getPort());
+   * This optimization is effective when there is a specific reasoning to exclude an entire
region from the M-R job,
+   * Useful when we need to remember the last-processed top record and revisit the [last,
current) interval for M-R processing,
+   * continuously. In addition to reducing InputSplits, reduces the load on the region server
as well, due to the ordering of the keys.
+   * Override this method, if you want to bulk exclude regions altogether from M-R. By default,
no region is excluded( i.e. all regions are included).

  {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/11541//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11541//artifact/patchprocess/newPatchFindbugsWarningshbase-rest.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11541//artifact/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11541//artifact/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11541//artifact/patchprocess/newPatchFindbugsWarningshbase-annotations.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11541//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11541//artifact/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11541//artifact/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11541//artifact/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11541//artifact/patchprocess/newPatchFindbugsWarningshbase-thrift.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11541//artifact/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11541//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop2-compat.html
Checkstyle Errors: https://builds.apache.org/job/PreCommit-HBASE-Build/11541//artifact/patchprocess/checkstyle-aggregate.html

  Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/11541//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,
>            Reporter: Weichen Ye
>         Attachments: HBASE-12394.patch
> 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.
> The following new files are included in this patch:
> TableMultiRegionInputFormat.java
> TableMultiRegionInputFormatBase.java
> TableMultiRegionMapReduceUtil.java
> *TestTableMultiRegionInputFormatScan1.java
> *TestTableMultiRegionInputFormatScan2.java
> *TestTableMultiRegionInputFormatScanBase.java
> *TestTableMultiRegionMapReduceUtil.java
> The files start with * are tests.
> In order to support multiple regions for one mapper, we need a new property in configuration--"hbase.mapreduce.scan.regionspermapper"
> This is an example,which means each mapper has 3 regions as input.
> <property>
>      <name>hbase.mapreduce.scan.regionspermapper</name>
>      <value>3</value>
> </property>
> This is an example for Java code:
> TableMultiRegionMapReduceUtil.initTableMapperJob(tablename, scan, Map.class, Text.class,
Text.class, job);

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