[ https://issues.apache.org/jira/browse/MAPREDUCE-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Devaraj Das updated MAPREDUCE-1938: ----------------------------------- Attachment: mr-1938-bp20.patch Patch for Y20. Not for commit here. The patch defines a configuration option using which users can specify that the system classpath be added last in the list of classpaths created before launching a task. It also introduces a HADOOP_CLIENT_CLASSPATH env variable in the hadoop shell script that should be set to point to the user's jar/classpath (containing his implementation of the system classes) before submitting a job over command line. > Ability for having user's classes take precedence over the system classes for > tasks' classpath > ---------------------------------------------------------------------------------------------- > > Key: MAPREDUCE-1938 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-1938 > Project: Hadoop Map/Reduce > Issue Type: New Feature > Components: job submission, task, tasktracker > Reporter: Devaraj Das > Fix For: 0.22.0 > > Attachments: mr-1938-bp20.patch > > > It would be nice to have the ability in MapReduce to allow users to specify > for their jobs alternate implementations of classes that are already defined > in the MapReduce libraries. For example, an alternate implementation for > CombineFileInputFormat. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.