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From "huozhanfeng@gmail.com" <huozhanf...@gmail.com>
Subject How to limit MRJob's stdout/stderr size(yarn2.3)
Date Thu, 03 Jul 2014 04:21:49 GMT
Hi,friend:

    When a MRJob print too much stdout or stderr log, the disk will be filled. Now it has
influence our platform management. 

    I have improved org.apache.hadoop.mapred.MapReduceChildJVM.java(come from@org.apache.hadoop.mapred.TaskLog)
to generate the execute cmd 
as follows: 

exec /bin/bash -c "( $JAVA_HOME/bin/java -Djava.net.preferIPv4Stack=true -Dhadoop.metrics.log.level=WARN
-Xmx1024m -Djava.io.tmpdir=$PWD/tmp -     Dlog4j.configuration=container-log4j.properties
-Dyarn.app.container.log.dir=/logs/userlogs/application_1403930653208_0003/container_1403930653208_0003_01_000002
-Dyarn.app.container.log.filesize=10240 -Dhadoop.root.logger=DEBUG,CLA org.apache.hadoop.mapred.YarnChild
$test_IP 53911 attempt_1403930653208_0003_m_000000_0 2 | tail -c 102 >/logs/userlogs/application_1403930653208_0003/container_1403930653208_0003_01_000002/stdout
; exit $PIPESTATUS ) 2>&1 | tail -c 10240 >/logs/userlogs/application_1403930653208_0003/container_1403930653208_0003_01_000002/stderr
; exit $PIPESTATUS " 


    But it doesn't take effect. 

    And then, when I use "export YARN_NODEMANAGER_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,address=8788,server=y,suspend=y"
for debuging NodeManager, I find when I set the BreakPoints at org.apache.hadoop.util.Shell(line
450:process = builder.start()) and org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch(line
161:List<String> newCmds = new ArrayList<String>(command.size())) the cmd will
work. 

    I doubt there's concurrency problem caused pipe shell will not perform properly. It matters,
and I need help. 

   @https://issues.apache.org/jira/browse/YARN-2231

thanks



Zhanfeng Huo
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