Piotr Kołaczkowski created MAPREDUCE-5126:
---------------------------------------------
Summary: Add possibility to set a custom system classloader for
mapred child processes, separate from mapred.child.java.opts
Key: MAPREDUCE-5126
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5126
Project: Hadoop Map/Reduce
Issue Type: New Feature
Reporter: Piotr Kołaczkowski
Priority: Minor
Some third party frameworks / systems based on Hadoop might want to set a
custom classloader for loading classes of their jobs to better resolve
conflicts with their libraries.
While it is possible to set a custom classloader using the
mapred.child.java.opts, this field is often overriden by users in their job
configuration. So in order to change e.g. heap sizes the user would need to
remember also to include the custom classloader property from the
framework-defaults or otherwise he would break the framework.
This small patch introduces another parameter: mapred.child.java.class.loader
that allows to set the classloader separately. This gives custom frameworks
built on top of Hadoop more flexibility to supply their own classloader,
without need to force users to adjust any settings.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
