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From "Fuad Efendi" <f...@efendi.ca>
Subject OOM: I can't set -Xmx!
Date Sun, 10 Jan 2010 05:31:15 GMT

After deep investigation of specific OOMs, it seems I can't set -Xmx1024m
for MapRed tasks; memory analysis (for Mappers & Reducers) always shows
magic
-Xmx (maximal heap size) is 536870912 bytes

At the same time, for TaskTracker it shows
-Xmx (maximal heap size) is 1048576000 bytes


Strange! Hadoop 0.19.2, with hadoop-site.xml properly replicated in
cluster...
<property>
  <name>mapred.child.java.opts</name>
  <value>-server -Xms1g -Xmx1g</value>


Has anyone had anything like that? I can't set -Xmx!

-Fuad
http://www.tokenizer.ca




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