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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9870) Mixed configurations for JVM -Xmx in hadoop command
Date Wed, 20 Nov 2013 03:57:23 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13827301#comment-13827301
] 

Hadoop QA commented on HADOOP-9870:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12614776/HADOOP-9870.patch
  against trunk revision .

    {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 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

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

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-common-project/hadoop-common.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/3301//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/3301//console

This message is automatically generated.

> Mixed configurations for JVM -Xmx in hadoop command
> ---------------------------------------------------
>
>                 Key: HADOOP-9870
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9870
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Wei Yan
>         Attachments: HADOOP-9870.patch, HADOOP-9870.patch, HADOOP-9870.patch
>
>
> When we use hadoop command to launch a class, there are two places setting the -Xmx configuration.
> *1*. The first place is located in file {{hadoop-common-project/hadoop-common/src/main/bin/hadoop}}.
> {code}
> exec "$JAVA" $JAVA_HEAP_MAX $HADOOP_OPTS $CLASS "$@"
> {code}
> Here $JAVA_HEAP_MAX is configured in hadoop-config.sh ({{hadoop-common-project/hadoop-common/src/main/bin/hadoop-config.sh}}).
The default value is "-Xmx1000m".
> *2*. The second place is set with $HADOOP_OPTS in file {{hadoop-common-project/hadoop-common/src/main/bin/hadoop}}.
> {code}
> HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
> {code}
> Here $HADOOP_CLIENT_OPTS is set in hadoop-env.sh ({{hadoop-common-project/hadoop-common/src/main/conf/hadoop-env.sh}})
> {code}
> export HADOOP_CLIENT_OPTS="-Xmx512m $HADOOP_CLIENT_OPTS"
> {code}
> Currently the final default java command looks like:
> {code}java -Xmx1000m .... -Xmx512m CLASS_NAME ARGUMENTS"{code}
> And if users also specify the -Xmx in the $HADOOP_CLIENT_OPTS, there will be three -Xmx
configurations. 
> The hadoop setup tutorial only discusses hadoop-env.sh, and it looks that users should
not make any change in hadoop-config.sh.
> We should let hadoop smart to choose the right one before launching the java command,
instead of leaving for jvm to make the decision.



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