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Review request for pig, Cheolsoo Park, Daniel Dai, Mark Wagner, and Rohini Palaniswamy.
Bugs: PIG-3629
Repository: pig-git

Implement STREAM operator in Tez - https://issues.apache.org/jira/browse/PIG-3629

In this patch, I do not add resources to pig-misc.jar, I just add them individually. See my discussion post: https://groups.google.com/forum/#!topic/pig-on-tez/8S80GMKhMaU

Basic Changes:
-Run the PhyPlanSetter and EndOfAllInputSetter to set the parent plan and the end-of-all input flags necessary for STREAM, just like in MR Pig.
-Add a map to hold plan-specific extra local resources in TezOperPlan.java. These resources can either come from the user's directory (e.g. SHIP('/home/abain/foo')) or from HDFS (e.g. CACHE('/user/abain/bar') in HDFS).
-Add the new class TezPOStreamVisitor that assembles all the plan-specific local resources that get added in TezOperPlan.java.

Resource Manager Changes:
-TezResourcManager resources were previously a map of java.net.URL -> Path in HDFS. Previously, the URL's were all local files, e.g. file://home/abain/pig-withouthHadoop.jar. However, the CACHE statement requires that resources already present in HDFS be able to be added as local resources. Unfortunately java.net.URL does not support hdfs:// URL's, so I changed this data structure to be a YARN URL instead. I also added methods to the ResourceManager to distinguish whether you are adding a local resource or a resource already present in HDFS.
-CACHE also supports URL's with fragments at the end, which become a "shortcut" to the name, e.g. CACHE(/input/big-data-name.gz#data.gz). I changed the resource manager to look for a fragments and use that as the resource name (if the fragment exist). This results in the symlink to the resource being created with the fragment name, which is what we want.

  src/org/apache/pig/backend/hadoop/executionengine/mapReduceLayer/plans/EndOfAllInputSetter.java 37566ab
  src/org/apache/pig/backend/hadoop/executionengine/tez/PigProcessor.java 7a1736a
  src/org/apache/pig/backend/hadoop/executionengine/tez/TezCompiler.java 2584501
  src/org/apache/pig/backend/hadoop/executionengine/tez/TezDagBuilder.java 96ccdde
  src/org/apache/pig/backend/hadoop/executionengine/tez/TezJobControlCompiler.java 135b933
  src/org/apache/pig/backend/hadoop/executionengine/tez/TezOperPlan.java 0cc8e17
  src/org/apache/pig/backend/hadoop/executionengine/tez/TezPOStreamVisitor.java PRE-CREATION
  src/org/apache/pig/backend/hadoop/executionengine/tez/TezPlanContainer.java 673fd70
  src/org/apache/pig/backend/hadoop/executionengine/tez/TezResourceManager.java 0fd7575

Diff: https://reviews.apache.org/r/16309/diff/

Added a unit test to TestTezCompiler.java
Added an e2e test to tez.conf

ant test-tez passes
ant test-e2e-tez has three failures - I am investigating to see if they are releated, or perhaps just transient

Question: There is already a separate suite of STREAM tests in streaming.conf. Maybe I should remove my e2e test and we should add streaming.conf as a dependency to the test-e2e-tez target? I haven't tried to run streaming.conf yet.

Alex Bain

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