[HOD] No way to set HADOOP_OPTS environment variable to the Hadoop daemons
through HOD
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Key: HADOOP-2766
URL: https://issues.apache.org/jira/browse/HADOOP-2766
Project: Hadoop Core
Issue Type: Bug
Components: contrib/hod
Affects Versions: 0.16.0
Reporter: Hemanth Yamijala
Assignee: Hemanth Yamijala
Priority: Critical
For purposes of performance tuning it should be possible to set some
environment variables that Hadoop honors before launching the Hadoop daemons.
For e.g. to set the heap size of the JVM, we should set the HADOOP_HEAPSIZE
variable. These can be configured through hodrc using the
gridservice-mapred.envs environment variable. This works for everything
*except* HADOOP_OPTS, which is also useful, for e.g. to pass in Garbage
collection parameters to the JVM, like -XX:+UseParallelGC. This is because HOD
tries to set HADOOP_OPTS from the gridservice-mapred.java-opts variable, but it
does not read the java-opts variable anywhere properly.
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