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From "Kartashov, Andy" <Andy.Kartas...@mpac.ca>
Subject RE: Java heap space error
Date Mon, 22 Oct 2012 14:16:11 GMT

I have been experiencing this type of an error at some point and no matter how much I played
with heap size  it didn't work. What I found out at the end is I was running out of physical
memory. My output file was about 4Gb with only 2.5Gb of free space available. Check you space
with "$hadop fs -df

From: Subash D'Souza [mailto:sdsouza@truecar.com]
Sent: Sunday, October 21, 2012 9:19 AM
To: user@hadoop.apache.org
Subject: Java heap space error

I'm running CDH 4 on  a 4 node cluster each with 96 G of RAM. Up until last week the cluster
was running until there was an error in the name node log file and I had to reformat it put
the data back

Now when I run hive on YARN. I keep getting a Java heap space error. Based on the research
I did. I upped the my mapred.child.java.opts first from 200m to 400 m to 800m and I still
have the same issue. It seems to fail near the 100% mapper mark

I checked the log files and the only thing that it does output is java heap space error. Nothing

Any help would be appreciated.


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