Provide a way to use 'uber' jars with Oozie MR actions
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Key: OOZIE-654
URL: https://issues.apache.org/jira/browse/OOZIE-654
Project: Oozie
Issue Type: Improvement
Reporter: Harsh J
Assignee: Harsh J
Priority: Minor
Right now, say if you have a custom MR code in a jar that has a {{lib/}} folder
inside which carries more dependent jars (a structure known as 'uber' jars),
and you submit the job via a regular 'hadoop jar' command, these lib/*.jars get
picked up by the framework because the supplied jar is specified explicitly via
conf.setJarByClass or conf.setJar. That is, if this user uber jar goes to the
JT as the mapred.jar, then it is handled by the framework properly and the
lib/*.jars are all considered and placed on the classpath.
Distributed cache jars do not have this effect, and that is cause the MR
framework does not consider them as uber jars and does not extract and use
their internal lib/ directories.
We should have a way in oozie to let users promote one of their jars as uber
jars, as an option.
Proposal: Have an optional oozie-prefixed config, or an optional element in the
MR action XML, that lets user specify what class should be loaded to be set as
setJarByClass(...). This will have to be a class available in the higher level
of the uber jar (not under lib/) but can be any class inside the targeted jar
really (just not from a jar under lib/). We then set this as
jobConf.setJarByClass(loadedCls), and then run the job.
Thoughts?
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