I have added this property to mapred-default.xml file.

-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12519980/MAPREDUCE-3947.patch
against trunk revision .

+1 @author. The patch does not contain any @author tags.

-1 tests included. 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.

+1 javadoc. The javadoc tool did not generate any warning messages.

+1 javac. The applied patch does not increase the total number of javac compiler warnings.

+1 eclipse:eclipse. The patch built with eclipse:eclipse.

+1 findbugs. The patch does not introduce any 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 passed unit tests in .

+1 contrib tests. The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/2103//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/2103//console

This message is automatically generated.

-1 tests included. 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.

No tests needed for this since it is a documentation issue.

I think the default AM memory is also under review. Do we really need 2 GB defaults for the AM?

Perhaps you can mark this as dupe of MAPREDUCE-3812 and improve upon Vinod's patch on that, which sorta lowers configs (still a good place to add to xml)?

Harsh, I agree that MAPREDUCE-3812 is a good place to add in the config, but it has been stalled for a while and it is not a big deal for MAPREDUCE-3812 to update the default.xml as well.

I am +1 the change is simple enough and documents the config properly.

Thanks Devaraj, I put this into trunk, branch-2, and branch-0.23

Integrated in Hadoop-Hdfs-trunk-Commit #2185 (See https://builds.apache.org/job/Hadoop-Hdfs-trunk-Commit/2185/)
MAPREDUCE-3947. yarn.app.mapreduce.am.resource.mb not documented (Devaraj K via bobby) (Revision 1328111)

Result = SUCCESS
bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1328111
Files :

• /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
• /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml

Integrated in Hadoop-Common-trunk-Commit #2111 (See https://builds.apache.org/job/Hadoop-Common-trunk-Commit/2111/)
MAPREDUCE-3947. yarn.app.mapreduce.am.resource.mb not documented (Devaraj K via bobby) (Revision 1328111)

Result = SUCCESS
bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1328111
Files :

• /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
• /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml

Integrated in Hadoop-Mapreduce-trunk-Commit #2128 (See https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/2128/)
MAPREDUCE-3947. yarn.app.mapreduce.am.resource.mb not documented (Devaraj K via bobby) (Revision 1328111)

Result = SUCCESS
bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1328111
Files :

• /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
• /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml

Robert - Agreed. Thanks for pushing this in. I'll also work on MAPREDUCE-4026 shortly.

Integrated in Hadoop-Hdfs-0.23-Build #233 (See https://builds.apache.org/job/Hadoop-Hdfs-0.23-Build/233/)
svn merge -c 1328111, FIXES: MAPREDUCE-3947. yarn.app.mapreduce.am.resource.mb not documented (Devaraj K via bobby) (Revision 1328113)

Result = SUCCESS
bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1328113
Files :

• /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/CHANGES.txt
• /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml

Integrated in Hadoop-Hdfs-trunk #1020 (See https://builds.apache.org/job/Hadoop-Hdfs-trunk/1020/)
MAPREDUCE-3947. yarn.app.mapreduce.am.resource.mb not documented (Devaraj K via bobby) (Revision 1328111)

Result = FAILURE
bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1328111
Files :

• /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
• /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml

Integrated in Hadoop-Mapreduce-trunk #1055 (See https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1055/)
MAPREDUCE-3947. yarn.app.mapreduce.am.resource.mb not documented (Devaraj K via bobby) (Revision 1328111)

Result = FAILURE
bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1328111
Files :

• /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
• /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml