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https://issues.apache.org/jira/browse/HADOOP-2766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12564734#action_12564734
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vinodkv edited comment on HADOOP-2766 at 2/1/08 4:31 AM:
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Fixed this. Now users can set HADOOP_OPTS by specifying it in configuration
parameters gridservice-mapred.envs or gridservice-hdfs.envs depending on where
it need to be specified. Any special characters present have to escaped.
e.g: ./bin/hod -c ~/hodrc.old -o "allocate ~/hod/clusterpath
4" -t ~/hadoop-0.17.0-dev.tar.gz
--gridservice-hdfs.envs="HADOOP_OPTS=-XX:+MaxFDLimit\ -XX:MaxHeapFreeRatio\=70"
--gridservice-mapred.envs="HADOOP_OPTS=-XX:MaxHeapFreeRatio\=70"
Also forcing validation of both envs variables, absence of which was throwing
uncaught exceptions when invalid list of keyval pairs is specified by user.
was (Author: vinodkv):
Fixed this. Now users can set HADOOP_OPTS by specifying it in configuration
parameters gridservice-mapred.envs or gridservice-hdfs.envs depending on where
it need to be specified. Any special characters present have to escaped.
e.g: ./bin/hod -c ~/hodrc.old -o "allocate ~/hod/clusterpath 4" -t
~/hadoop-0.17.0-dev.tar.gz
--gridservice-hdfs.envs="HADOOP_OPTS=-XX:+MaxFDLimit\ -XX:MaxHeapFreeRatio\=70"
--gridservice-mapred.envs="HADOOP_OPTS=-XX:MaxHeapFreeRatio\=70"
Also forcing validation of both envs variables, absence of which was throwing
uncaught exceptions when invalid list of keyval pairs is specified by user.
> [HOD] No way to set HADOOP_OPTS environment variable to the Hadoop daemons
> through HOD
> --------------------------------------------------------------------------------------
>
> 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: Vinod Kumar Vavilapalli
> Priority: Critical
> Attachments: hadoop-2766
>
>
> 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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