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https://issues.apache.org/jira/browse/FLINK-9577?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Greg Hogan resolved FLINK-9577.
-------------------------------
Resolution: Not A Bug
We do test for this in `PageRankTest.testWithEmptyGraphWithoutVertices`.
Divide-by-zero is only an error for integer division and here were are
operating as `double`.
> Divide-by-zero in PageRank
> --------------------------
>
> Key: FLINK-9577
> URL: https://issues.apache.org/jira/browse/FLINK-9577
> Project: Flink
> Issue Type: Bug
> Components: Gelly
> Affects Versions: 1.4.0, 1.5.0, 1.6.0
> Reporter: Chesnay Schepler
> Assignee: vinoyang
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> {code}
> // org.apache.flink.graph.library.linkanalysis.PageRank#AdjustScores#open
> this.vertexCount = vertexCountIterator.hasNext() ?
> vertexCountIterator.next().getValue() : 0;
> this.uniformlyDistributedScore = ((1 - dampingFactor) + dampingFactor *
> sumOfSinks) / this.vertexCount;
> {code}
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