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From Alex Kozlov <ale...@cloudera.com>
Subject Re: java.lang.OutOfMemoryError: Java heap space
Date Sat, 10 Jul 2010 22:44:31 GMT
Hi Shuja,

First, thank you for using CDH3.  Can you also check what m*
apred.child.ulimit* you are using?  Try adding "*
-D mapred.child.ulimit=3145728*" to the command line.

I would also recommend to upgrade java to JDK 1.6 update 8 at a minimum,
which you can download from the Java SE
Homepage<http://java.sun.com/javase/downloads/index.jsp>
.

Let me know how it goes.

Alex K

On Sat, Jul 10, 2010 at 12:59 PM, Shuja Rehman <shujamughal@gmail.com>wrote:

> Hi Alex
>
> Yeah, I am running a job on cluster of 2 machines and using Cloudera
> distribution of hadoop. and here is the output of this command.
>
> root      5277  5238  3 12:51 pts/2    00:00:00 /usr/jdk1.6.0_03/bin/java
> -Xmx1023m -Dhadoop.log.dir=/usr/lib         /hadoop-0.20/logs
> -Dhadoop.log.file=hadoop.log -Dhadoop.home.dir=/usr/lib/hadoop-0.20
> -Dhadoop.id.str= -Dhado         op.root.logger=INFO,console
> -Dhadoop.policy.file=hadoop-policy.xml -classpath
> /usr/lib/hadoop-0.20/conf:/usr/
>
> jdk1.6.0_03/lib/tools.jar:/usr/lib/hadoop-0.20:/usr/lib/hadoop-0.20/hadoop-core-0.20.2+320.jar:/usr/lib/hadoo
>
> p-0.20/lib/commons-cli-1.2.jar:/usr/lib/hadoop-0.20/lib/commons-codec-1.3.jar:/usr/lib/hadoop-0.20/lib/common
>
> s-el-1.0.jar:/usr/lib/hadoop-0.20/lib/commons-httpclient-3.0.1.jar:/usr/lib/hadoop-0.20/lib/commons-logging-1
>
> .0.4.jar:/usr/lib/hadoop-0.20/lib/commons-logging-api-1.0.4.jar:/usr/lib/hadoop-0.20/lib/commons-net-1.4.1.ja
>
> r:/usr/lib/hadoop-0.20/lib/core-3.1.1.jar:/usr/lib/hadoop-0.20/lib/hadoop-fairscheduler-0.20.2+320.jar:/usr/l
>
> ib/hadoop-0.20/lib/hadoop-scribe-log4j-0.20.2+320.jar:/usr/lib/hadoop-0.20/lib/hsqldb-1.8.0.10.jar:/usr/lib/h
>
> adoop-0.20/lib/hsqldb.jar:/usr/lib/hadoop-0.20/lib/jackson-core-asl-1.0.1.jar:/usr/lib/hadoop-0.20/lib/jackso
>
> n-mapper-asl-1.0.1.jar:/usr/lib/hadoop-0.20/lib/jasper-compiler-5.5.12.jar:/usr/lib/hadoop-0.20/lib/jasper-ru
>
> ntime-5.5.12.jar:/usr/lib/hadoop-0.20/lib/jets3t-0.6.1.jar:/usr/lib/hadoop-0.20/lib/jetty-6.1.14.jar:/usr/lib
>
> /hadoop-0.20/lib/jetty-util-6.1.14.jar:/usr/lib/hadoop-0.20/lib/junit-4.5.jar:/usr/lib/hadoop-0.20/lib/kfs-0.
>
> 2.2.jar:/usr/lib/hadoop-0.20/lib/libfb303.jar:/usr/lib/hadoop-0.20/lib/libthrift.jar:/usr/lib/hadoop-0.20/lib
>
> /log4j-1.2.15.jar:/usr/lib/hadoop-0.20/lib/mockito-all-1.8.2.jar:/usr/lib/hadoop-0.20/lib/mysql-connector-jav
>
> a-5.0.8-bin.jar:/usr/lib/hadoop-0.20/lib/oro-2.0.8.jar:/usr/lib/hadoop-0.20/lib/servlet-api-2.5-6.1.14.jar:/u
>
> sr/lib/hadoop-0.20/lib/slf4j-api-1.4.3.jar:/usr/lib/hadoop-0.20/lib/slf4j-log4j12-1.4.3.jar:/usr/lib/hadoop-0
>
> .20/lib/xmlenc-0.52.jar:/usr/lib/hadoop-0.20/lib/jsp-2.1/jsp-2.1.jar:/usr/lib/hadoop-0.20/lib/jsp-2.1/jsp-api
> -2.1.jar org.apache.hadoop.util.RunJar
> /usr/lib/hadoop-0.20/contrib/streaming/hadoop-streaming-0.20.2+320.jar
> -D mapred.child.java.opts=-Xmx2000M -inputformat StreamInputFormat
> -inputreader StreamXmlRecordReader,begin=         <mdc xmlns:HTML="
> http://www.w3.org/TR/REC-xml">,end=</mdc> -input
> /user/root/RNCDATA/MDFDORKUCRAR02/A20100531
> .0000-0700-0015-0700_RNCCN-MDFDORKUCRAR02 -jobconf mapred.map.tasks=1
> -jobconf mapred.reduce.tasks=0 -output          RNC11 -mapper
> /home/ftpuser1/Nodemapper5.groovy -reducer
> org.apache.hadoop.mapred.lib.IdentityReducer -file /
> home/ftpuser1/Nodemapper5.groovy
> root      5360  5074  0 12:51 pts/1    00:00:00 grep Nodemapper5.groovy
>
>
>
> ------------------------------------------------------------------------------------------------------------------------------
> and what is meant by OOM and thanks for helping,
>
> Best Regards
>
>
> On Sun, Jul 11, 2010 at 12:30 AM, Alex Kozlov <alexvk@cloudera.com> wrote:
>
> > Hi Shuja,
> >
> > It looks like the OOM is happening in your code.  Are you running
> MapReduce
> > in a cluster?  If so, can you send the exact command line your code is
> > invoked with -- you can get it with a 'ps -Af | grep Nodemapper5.groovy'
> > command on one of the nodes which is running the task?
> >
> > Thanks,
> >
> > Alex K
> >
> > On Sat, Jul 10, 2010 at 10:40 AM, Shuja Rehman <shujamughal@gmail.com
> > >wrote:
> >
> > > Hi All
> > >
> > > I am facing a hard problem. I am running a map reduce job using
> streaming
> > > but it fails and it gives the following error.
> > >
> > > Caught: java.lang.OutOfMemoryError: Java heap space
> > >        at Nodemapper5.parseXML(Nodemapper5.groovy:25)
> > >
> > > java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess
> > > failed with code 1
> > >        at
> > >
> >
> org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:362)
> > >        at
> > >
> >
> org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:572)
> > >
> > >        at
> > org.apache.hadoop.streaming.PipeMapper.close(PipeMapper.java:136)
> > >        at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:57)
> > >        at
> > > org.apache.hadoop.streaming.PipeMapRunner.run(PipeMapRunner.java:36)
> > >        at
> org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
> > >
> > >        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
> > >        at org.apache.hadoop.mapred.Child.main(Child.java:170)
> > >
> > >
> > > I have increased the heap size in hadoop-env.sh and make it 2000M. Also
> I
> > > tell the job manually by following line.
> > >
> > > -D mapred.child.java.opts=-Xmx2000M \
> > >
> > > but it still gives the error. The same job runs fine if i run on shell
> > > using
> > > 1024M heap size like
> > >
> > > cat file.xml | /root/Nodemapper5.groovy
> > >
> > >
> > > Any clue?????????
> > >
> > > Thanks in advance.
> > >
> > > --
> > > Regards
> > > Shuja-ur-Rehman Baig
> > > _________________________________
> > > MS CS - School of Science and Engineering
> > > Lahore University of Management Sciences (LUMS)
> > > Sector U, DHA, Lahore, 54792, Pakistan
> > > Cell: +92 3214207445
> > >
> >
>
>
>
> --
> Regards
> Shuja-ur-Rehman Baig
> _________________________________
> MS CS - School of Science and Engineering
> Lahore University of Management Sciences (LUMS)
> Sector U, DHA, Lahore, 54792, Pakistan
> Cell: +92 3214207445
>

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