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https://issues.apache.org/jira/browse/GIRAPH-967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14280628#comment-14280628
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Hudson commented on GIRAPH-967:
-------------------------------
FAILURE: Integrated in Giraph-trunk-Commit #1517 (See
[https://builds.apache.org/job/Giraph-trunk-Commit/1517/])
GIRAPH-967: (Strongly Connected Components) bug fix (mhan via majakabiljo)
(majakabiljo:
http://git-wip-us.apache.org/repos/asf?p=giraph.git&a=commit&h=9d20d69fdb0be53a5410711489173f808fbe6f4e)
* CHANGELOG
*
giraph-examples/src/main/java/org/apache/giraph/examples/scc/SccPhaseMasterCompute.java
> GIRAPH-931 (Strongly Connected Components) bug fix
> --------------------------------------------------
>
> Key: GIRAPH-967
> URL: https://issues.apache.org/jira/browse/GIRAPH-967
> Project: Giraph
> Issue Type: Bug
> Components: examples
> Reporter: Young Han
> Priority: Minor
> Attachments: GIRAPH-967.patch
>
>
> GIRAPH-931, which provides an implementation of strongly connected components
> (SCC), uses the non-commutative BooleanOverwriteAggregator. This causes a
> race condition between workers, leading to incorrect results when increasing
> the number of workers. For example, the amazon0505 graph from SNAP will give
> different (incorrect) results with 8 workers compared to 1.
> The fix uses BooleanOrAggregator instead of BooleanOverwriteAggregator.
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