Hi Sadak AFAIK HADOOP_HEAPSIZE determines the jvm size of the daemons like NN,JT,TT,DN etc.
mapred.child.java.opts and mapred.child.ulimit is used to set the jvm heap for child jvms launched for each map/reduce task launched. Regards Bejoy KS Sent from handheld, please excuse typos. -----Original Message----- From: Visioner Sadak <visioner.sa...@gmail.com> Date: Fri, 5 Oct 2012 13:47:24 To: <user@hadoop.apache.org> Reply-To: user@hadoop.apache.org Subject: Re: hadoop memory settings coz i m getting Error occurred during initialization of VM hadoop java.lang.Throwable: Child Error At org.apache.hadoop.mapred.TaskRunner.run whe running a job.....:) On Fri, Oct 5, 2012 at 1:39 PM, Visioner Sadak <visioner.sa...@gmail.com>wrote: > Is ther a relation between HADOOP_HEAPSIZE mapred.child.java.opts and > mapred.child.ulimit settings in hadoop-env.sh and mapred-site.xml i have a > sinngle machine with 2gb ram and running hadoop on psuedo distr mode my > HADOOP_HEAPSIZE is set to 256 wat shud i set mapred.child.java.opts and > mapred.child.ulimit and how these settings are calculated if my ram is > incresed or machine clusters are increased
