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https://issues.apache.org/jira/browse/OOZIE-2066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14716912#comment-14716912
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Robert Kanter commented on OOZIE-2066:
--------------------------------------
The way this works, is that Oozie simply takes any Hadoop/Mapreduce property
that starts with "oozie.launcher" and applies it to the Launcher Job; it
doesn't do anything special for
{{oozie.launcher.mapreduce.task.classpath.user.precedence}},
{{oozie.launcher.mapreduce.user.classpath.first}}, or any others. So if
{{oozie.launcher.mapreduce.task.classpath.user.precedence}} is not working, you
can blame Hadoop for having at least [three similarly named properties for
this|http://stackoverflow.com/questions/11685949/overriding-default-hadoop-jars-in-class-path].
> oozie.launcher.mapreduce.task.classpath.user.precedence is not respected
> ------------------------------------------------------------------------
>
> Key: OOZIE-2066
> URL: https://issues.apache.org/jira/browse/OOZIE-2066
> Project: Oozie
> Issue Type: Bug
> Environment: yarn
> Reporter: Tim Robertson
> Priority: Critical
> Attachments: test-wf.zip
>
>
> When using MR2, the user classpath precedence is not read from the job
> configuration.
> When submitting a job, the following configuration should result in the java
> action running with the user classpath before the Hadoop jars.
> {code:xml}
> <property>
> <name>oozie.launcher.mapreduce.task.classpath.user.precedence</name>
> <value>true</value>
> </property>
> {code}
> When used in a Java action:
> {code:xml}
> <action name="run-test">
> <java>
> <job-tracker>c1n2.gbif.org:8032</job-tracker>
> <name-node>hdfs://c1n1.gbif.org:8020</name-node>
> <main-class>test.CPTest</main-class>
> </java>
> <ok to="end" />
> <error to="kill" />
> </action>
> {code}
> However, it is not...
> There is a workaround, by setting this on the task directly in the workflow:
> {code:xml}
> <action name="run-test">
> <java>
> <job-tracker>c1n2.gbif.org:8032</job-tracker>
> <name-node>hdfs://c1n1.gbif.org:8020</name-node>
> <configuration>
> <property>
> <name>oozie.launcher.mapreduce.task.classpath.user.precedence</name>
> <value>true</value>
> </property>
> </configuration>
> <main-class>test.CPTest</main-class>
> </java>
> <ok to="end" />
> <error to="kill" />
> </action>
> {code}
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