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From "Eli Reisman" <>
Subject Re: Review Request: GIRAPH-13: Port Giraph to YARN
Date Thu, 28 Mar 2013 22:06:38 GMT

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(Updated March 28, 2013, 10:06 p.m.)

Review request for giraph.


Another rebase to trunk, is good to go as of today (for now!) See previous updated descriptions
for a good command line to build and run this. Thanks for your time!


Port Giraph to "pure YARN" clusters, using Hadoop MapReduce classes in our code (IO formats
etc.) but running the cluster job without any active participation by a running MapReduce
framework. This means doing some things ourselves that Hadoop used to do for us.

I am putting this up for review to aid some non-Giraphers in having a peek at the YARN component.
There is a bit of latency in the job launch that I am still diagnosing. I am also still finishing
up an integration test to verify the YARN components can run a no-op Giraph job successfully.
All BSP code is covered by our MRv1 tests, which are sufficient since once Giraph is running,
it does not know or care if its running on YARN. The grand total is TWO files with FOUR actual
munges, total for the entire patch. All the rest is conditionally compiled and/or manipulated
through conf settings without ever calling into YARN-specific code from inside Giraph. This
will allow us to wait on ripping apart our IO formats or other MRv1 baked-in dependencies
before we're ready to abandon MR. This also sets up a paradigm by which it will be easy to
port us to other cluster frameworks (Mesos, etc.)

I will ping Giraph folks when this is really ready for review (hopefully next day or so) but
feel free to drop me a line now if you see something you are curious about or just plain don't
like. The sooner I fix it, the sooner this gets committed, so please speak up if you do.

My goal is to make this not only our port of YARN, but another (there aren't many) good and
well-commented example of how to run "real applications" like Giraph on YARN clusters. So
I'm hoping its clear and easy to follow on that level as well. Happy to hear feedback on that
angle as well!

Thanks! Will post a wiki page explaining a bit more about this when its all finished. This
version is still depending on Hadoop-2.0.3-alpha, but I will attempt to back port to 2.0.2
before I'm done, and a future JIRA should bring us to 2.0.0 or higher (and trunk of course.)

Diffs (updated)

  checkstyle.xml 370c120 
  giraph-core/pom.xml 3580d0c 
  giraph-core/src/main/java/org/apache/giraph/ 5bd5686 
  giraph-core/src/main/java/org/apache/giraph/bsp/ cc53271 
  giraph-core/src/main/java/org/apache/giraph/conf/ 963b82a 
  giraph-core/src/main/java/org/apache/giraph/conf/ c5b9b93 
  giraph-core/src/main/java/org/apache/giraph/graph/ 57f7dff 
  giraph-core/src/main/java/org/apache/giraph/master/ 404e47e 
  giraph-core/src/main/java/org/apache/giraph/utils/ bd30455 
  giraph-core/src/main/java/org/apache/giraph/worker/ 74c1f87 
  giraph-core/src/main/java/org/apache/giraph/yarn/ PRE-CREATION

  giraph-core/src/main/java/org/apache/giraph/yarn/ PRE-CREATION 
  giraph-core/src/main/java/org/apache/giraph/yarn/ PRE-CREATION 
  giraph-core/src/main/java/org/apache/giraph/yarn/ PRE-CREATION 
  giraph-core/src/main/java/org/apache/giraph/yarn/ PRE-CREATION 
  giraph-core/src/test/java/org/apache/giraph/yarn/ PRE-CREATION 
  giraph-core/src/test/resources/capacity-scheduler.xml PRE-CREATION 
  giraph-examples/pom.xml 3b6a08c 
  pom.xml 1e321b8 



Getting there, in-progress integration test is included for your amusment.


Eli Reisman

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