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From Viswanathan J <jayamviswanat...@gmail.com>
Subject Hadoop Jobtracker heap size calculation and OOME
Date Fri, 11 Oct 2013 17:08:55 GMT

I'm running a 14 nodes of Hadoop cluster with datanodes,tasktrackers
running in all nodes.

*Apache Hadoop :* 1.2.1

It shows the heap size currently as follows:

*Cluster Summary (Heap Size is 5.7/8.89 GB)*
In the above summary what is the *8.89* GB defines? Is the *8.89* defines
maximum heap size for Jobtracker, if yes how it has been calculated.

Hope *5.7* is currently running jobs heap-size, how it is calculated.

Have set the jobtracker default memory size in hadoop-env.sh

Have set the mapred.child.java.opts value in mapred-site.xml as,


Even after setting the above property, getting Jobtracker OOME issue. How
the jobtracker memory gradually increasing. After restart the JT, within a
week getting OOME.

How to resolve this, it is in production and critical? Please help. Thanks
in advance.


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