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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13251) Correct 'HBase, MapReduce, and the CLASSPATH' section in HBase Ref Guide
Date Mon, 04 May 2015 15:27:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14526746#comment-14526746

Hadoop QA commented on HBASE-13251:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against master branch at commit 1f02fffd044245fe777c2194517234950d530b35.
  ATTACHMENT ID: 12730168

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

    {color:green}+0 tests included{color}.  The patch appears to be a documentation patch
that doesn't require tests.

    {color:green}+1 hadoop versions{color}. The patch compiles with all supported hadoop versions
(2.4.1 2.5.2 2.6.0)

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 protoc{color}.  The applied patch does not increase the total number of
protoc 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
    +To give the MapReduce jobs the access they need, you could add _hbase-site.xml_ to _$HADOOP_HOME/conf_
and add HBase jars to the _$HADOOP_HOME/lib_ directory.
+You would then need to copy these changes across your cluster or edit _$HADOOP_HOME/conf/hadoop-env.sh_
and add them to the `HADOOP_CLASSPATH` variable.
+The recommended approach is to let HBase add its dependency jars itself and use `HADOOP_CLASSPATH`
or `-libjars`.
+The following example runs the bundled HBase link:http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/mapreduce/RowCounter.html[RowCounter]
MapReduce job against a table named `usertable`.
+If you have not set the environment variables expected in the command (the parts prefixed
by a `$` sign and surrounded by curly braces), you can use the actual system paths instead.
+The backticks (``` symbols) cause ths shell to execute the sub-commands, setting the output
of `hbase classpath` (the command to dump HBase CLASSPATH) to `HADOOP_CLASSPATH`.
+$ HADOOP_CLASSPATH=`${HBASE_HOME}/bin/hbase classpath` ${HADOOP_HOME}/bin/hadoop jar ${HBASE_HOME}/lib/hbase-server-VERSION.jar
rowcounter usertable
+$ HADOOP_CLASSPATH=${HBASE_BUILD_HOME}/hbase-server/target/hbase-server-VERSION-SNAPSHOT.jar:`${HBASE_BUILD_HOME}/bin/hbase
classpath` ${HADOOP_HOME}/bin/hadoop jar ${HBASE_BUILD_HOME}/hbase-server/target/hbase-server-VERSION-SNAPSHOT.jar
rowcounter usertable

  {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/13935//testReport/
Release Findbugs (version 2.0.3) 	warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/13935//artifact/patchprocess/newFindbugsWarnings.html
Checkstyle Errors: https://builds.apache.org/job/PreCommit-HBASE-Build/13935//artifact/patchprocess/checkstyle-aggregate.html

  Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/13935//console

This message is automatically generated.

> Correct 'HBase, MapReduce, and the CLASSPATH' section in HBase Ref Guide
> ------------------------------------------------------------------------
>                 Key: HBASE-13251
>                 URL: https://issues.apache.org/jira/browse/HBASE-13251
>             Project: HBase
>          Issue Type: Improvement
>          Components: documentation
>            Reporter: Jerry He
>            Assignee: li xiang
>              Labels: documentation
>         Attachments: HBASE-13251-v1.patch
> As [~busbey] pointed out in HBASE-13149, we have a section "HBase, MapReduce, and the
CLASSPATH" in the HBase Ref Guide.
> http://hbase.apache.org/book.html#hbase.mapreduce.classpath
> There are duplication, errors and misinformation in the section.
> Need to cleanup and polish it.

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