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svn merge -c 1309077 from trunk. FIXES MAPREDUCE-4072. User set java.library.path seems to overwrite default creating problems native lib loading (Anupam Seth via bobby) 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1309079 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Robert Joseph Evans 2012-04-03 18:03:18 +00:00
parent c6c7055c83
commit e76f7b7330
3 changed files with 16 additions and 1 deletions
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3
hadoop-mapreduce-project/CHANGES.txt
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@ -103,6 +103,9 @@ Release 0.23.3 - UNRELEASED
INCOMPATIBLE CHANGES INCOMPATIBLE CHANGES
MAPREDUCE-4072. User set java.library.path seems to overwrite default
creating problems native lib loading (Anupam Seth via bobby)
NEW FEATURES NEW FEATURES
IMPROVEMENTS IMPROVEMENTS

7
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml
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@ -412,7 +412,12 @@
-Xmx1024m -verbose:gc -Xloggc:/tmp/@taskid@.gc -Xmx1024m -verbose:gc -Xloggc:/tmp/@taskid@.gc
The configuration variable mapred.child.ulimit can be used to control the The configuration variable mapred.child.ulimit can be used to control the
maximum virtual memory of the child processes. maximum virtual memory of the child processes.
Usage of -Djava.library.path can cause programs to no longer function if
hadoop native libraries are used. These values should instead be set as part
of LD_LIBRARY_PATH in the map / reduce JVM env using the mapreduce.map.env and
mapreduce.reduce.env config settings.
</description> </description>
</property> </property>

7
hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-site/src/site/apt/WritingYarnApplications.apt.vm
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@ -779,6 +779,13 @@ Hadoop MapReduce Next Generation - Writing YARN Applications
need to increase the value of the the cluster-wide configuration variable need to increase the value of the the cluster-wide configuration variable
<<<yarn.nodemanager.vmem-pmem-ratio>>>. <<<yarn.nodemanager.vmem-pmem-ratio>>>.
** How do I include native libraries?
Setting -Djava.library.path on the command line while launching a container
can cause native libraries used by Hadoop to not be loaded correctly and can
result in errors. It is cleaner to use LD_LIBRARY_PATH instead.
* Useful Links * Useful Links
* {{{https://issues.apache.org/jira/secure/attachment/12486023/MapReduce_NextGen_Architecture.pdf}Map Reduce Next Generation Architecture}} * {{{https://issues.apache.org/jira/secure/attachment/12486023/MapReduce_NextGen_Architecture.pdf}Map Reduce Next Generation Architecture}}