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Date: Wed, 9 Nov 2011 11:18:53 +0000 (UTC)
From: "jiraposter@reviews.apache.org (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (GIRAPH-11) Improve the graph distribution of
 Giraph
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    [ https://issues.apache.org/jira/browse/GIRAPH-11?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13146944#comment-13146944 ] 

jiraposter@reviews.apache.org commented on GIRAPH-11:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/2788/
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Review request for giraph.


Summary
-------

Warning: This is a very large change!

Vertex ranges no longer exist.  A generic partitioner handles the
division of vertex ids to partitions.  As a default, there is a
HashPartitioner and a HashRangePartitioner that will use the hashCode
of a Java object to decide which partition to place the vertex.
Developers can write their own algorithm to determine how to change
the partitioning as well as implement the assignment of partitions to
workers.  All vertices loaded from the input split are sent to the
owner of the partition rather than loaded locally.  This eliminates the
constraint that the vertices must be ordered in the input split.

The checkpoint format has been changed to suit the new partition
style.  Checkpoints are now a lot simpler.  The master will assign
partitions and the workers will only load their own partitions from
the checkpoint.

Unfortunately, the vertex range implementation was baked into almost
every aspect of the code (hence the ridiculous size of this diff).
But now it should be flexible to support several different graph
partitioning schemes (i.e. hash-based, hash-ranged-based, and for
special cases, fully ranged-based).

Sorry for the long delay, but this way pretty involved.


This addresses bug GIRAPH-11.
    https://issues.apache.org/jira/browse/GIRAPH-11


Diffs
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  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/bsp/CentralizedServiceWorker.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/comm/BasicRPCCommunications.java 1196639 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/comm/CommunicationsInterface.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/comm/RPCCommunications.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/comm/ServerInterface.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/comm/WorkerCommunications.java 1196639 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/examples/GeneratedVertexInputFormat.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/examples/GeneratedVertexReader.java 1196639 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/examples/MaxAggregator.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/examples/MinAggregator.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/examples/SimpleMutateGraphVertex.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/examples/SimpleSuperstepVertex.java 1196639 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/examples/SuperstepBalancer.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/examples/SuperstepHashPartitioner.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/examples/VerifyMessage.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/AutoBalancer.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/BasicVertex.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/BasicVertexRangeBalancer.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/BspService.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/BspServiceMaster.java 1196639 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/BspServiceWorker.java 1198972 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/BspUtils.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/GiraphJob.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/GlobalStats.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/GraphMapper.java 1198972 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/GraphState.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/LongDoubleFloatDoubleVertex.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/MutableVertex.java 1196639 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/StaticBalancer.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/Vertex.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/VertexRange.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/VertexRangeBalancer.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/WorkerInfo.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/BasicPartitionOwner.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/GraphPartitioner.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/HashMasterPartitioner.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/HashPartitioner.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/HashRangePartitioner.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/HashRangeWorkerPartitioner.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/HashWorkerPartitioner.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/MasterGraphPartitioner.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/Partition.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/PartitionBalancer.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/PartitionExchange.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/PartitionOwner.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/PartitionStats.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/RangeMasterPartitioner.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/RangePartitionOwner.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/RangePartitionStats.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/RangePartitioner.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/RangeSplitHint.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/RangeWorkerPartitioner.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/partition/WorkerGraphPartitioner.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/utils/WritableUtils.java PRE-CREATION 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/zk/ZooKeeperExt.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/site/site.xml 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/test/java/org/apache/giraph/TestMutateGraphVertex.java 1199643 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/test/java/org/apache/giraph/TestVertexRangeBalancer.java 1186590 
  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/test/java/org/apache/giraph/TestVertexRangeBalancer.java 1199643 

Diff: https://reviews.apache.org/r/2788/diff


Testing
-------

local and MR unittests.  Added some simple unittests for testing the out-of-order input splits and other balancing algorithms.


Thanks,

Avery


> Improve the graph distribution of Giraph
> ----------------------------------------
>
>                 Key: GIRAPH-11
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-11
>             Project: Giraph
>          Issue Type: Improvement
>    Affects Versions: 0.70.0
>            Reporter: Avery Ching
>            Assignee: Avery Ching
>
> Currently, Giraph assumes that the data from the VertexInputFormat is sorted.  If the user data is not sorted by the vertex id, they must first run a MapReduce or Pig job to generate a sorted dataset.  This is often a bit inconvenient.
> Giraph graph partitioning is currently range based and there are some advantages and disadvantages of this approach.  The proposal of this JIRA would be to allow for both range and hash based partitioning and provide more flexibility to the user.
> Design goals for the graph distribution:
> * Allow vertices to be unordered or unordered
> * Ability to repartition
> * Select the partitioning scheme based on user needs (i.e. hash or range based)
> * Ability to provide user-specific hints about partitions
> Hash-based partitioning
> * Good vertex balancing across ranges for random data
> * Bad at vertex id locality
> Range-based partitioning
> * Good at vertex id locality
> * Ability to split ranges easily
> * Can cause hotspots for hot ranges

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