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https://issues.apache.org/jira/browse/GIRAPH-967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14280588#comment-14280588
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Maja Kabiljo commented on GIRAPH-967:
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Thank you! +1, I'll commit it.
> 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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