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https://issues.apache.org/jira/browse/GIRAPH-115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13175888#comment-13175888
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jirapos...@reviews.apache.org commented on GIRAPH-115:
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Ship it!


Looks great.  I'll commit on your behalf.


/trunk/src/test/java/org/apache/giraph/examples/ConnectedComponentsVertexTest.java
<https://reviews.apache.org/r/3313/#comment9277>

    I'll fix this one for you. =) Remove */.


- Avery


On 2011-12-25 09:36:39, Sebastian Schelter wrote:
bq.  
bq.  -----------------------------------------------------------
bq.  This is an automatically generated e-mail. To reply, visit:
bq.  https://reviews.apache.org/r/3313/
bq.  -----------------------------------------------------------
bq.  
bq.  (Updated 2011-12-25 09:36:39)
bq.  
bq.  
bq.  Review request for giraph.
bq.  
bq.  
bq.  Summary
bq.  -------
bq.  
bq.  Port of the HCC algorithm to Giraph. Each vertex needs to find the 
smallest vertex id in its component.
bq.  
bq.  I created a very memory-efficient abstract vertex in 
org.apache.giraph.graph.IntIntNullIntVertex and had 
org.apache.giraph.examples.ConnectedComponentsVertex extend that. 
org.apache.giraph.examples.ConnectedComponentsVertexTest contains an 
"integration" test on toy data.
bq.  
bq.  I had to patch org.apache.giraph.utils.InternalVertexRunner to allow the 
use of combiners and to shutdown() the local zookeeper instance in the tests.
bq.  
bq.  Local and pseudo-distributed unit tests were passed. I also tested the 
algorithm on a 6-machine hadoop cluster using the wikipedia pagelink graph 
(5.7M vertices, 130M edges).
bq.  
bq.  
bq.  This addresses bug GIRAPH-115.
bq.      https://issues.apache.org/jira/browse/GIRAPH-115
bq.  
bq.  
bq.  Diffs
bq.  -----
bq.  
bq.    
/trunk/src/main/java/org/apache/giraph/examples/ConnectedComponentsVertex.java 
PRE-CREATION 
bq.    
/trunk/src/main/java/org/apache/giraph/examples/IntIntNullIntTextInputFormat.java
 PRE-CREATION 
bq.    /trunk/src/main/java/org/apache/giraph/examples/MinimumIntCombiner.java 
PRE-CREATION 
bq.    
/trunk/src/main/java/org/apache/giraph/examples/VertexWithComponentTextOutputFormat.java
 PRE-CREATION 
bq.    /trunk/src/main/java/org/apache/giraph/graph/IntIntNullIntVertex.java 
PRE-CREATION 
bq.    /trunk/src/main/java/org/apache/giraph/utils/InternalVertexRunner.java 
1222837 
bq.    
/trunk/src/main/java/org/apache/giraph/utils/UnmodifiableIntArrayIterator.java 
PRE-CREATION 
bq.    
/trunk/src/test/java/org/apache/giraph/examples/ConnectedComponentsVertexTest.java
 PRE-CREATION 
bq.    
/trunk/src/test/java/org/apache/giraph/examples/MinimumIntCombinerTest.java 
PRE-CREATION 
bq.    
/trunk/src/test/java/org/apache/giraph/examples/SimpleShortestPathVertexTest.java
 1222837 
bq.  
bq.  Diff: https://reviews.apache.org/r/3313/diff
bq.  
bq.  
bq.  Testing
bq.  -------
bq.  
bq.  
bq.  Thanks,
bq.  
bq.  Sebastian
bq.  
bq.


                
> Port of the HCC algorithm for identifying all connected components of a graph
> -----------------------------------------------------------------------------
>
>                 Key: GIRAPH-115
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-115
>             Project: Giraph
>          Issue Type: New Feature
>    Affects Versions: 0.70.0
>            Reporter: Sebastian Schelter
>
> Port of the HCC algorithm that identifies connected components and assigns a 
> componented id (the smallest vertex id in the component) to each vertex.
> The idea behind the algorithm is very simple: propagate the smallest vertex 
> id along the edges to all vertices of a connected component until 
> convergence. The number of supersteps necessary is equal to the length of the 
> maximum diameter of all components + 1
> The original Hadoop-based variant of this algorithm was proposed by Kang, 
> Charalampos, Tsourakakis and Faloutsos in "PEGASUS: Mining Peta-Scale 
> Graphs", 2010
> http://www.cs.cmu.edu/~ukang/papers/PegasusKAIS.pdf

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