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https://issues.apache.org/jira/browse/HDFS-16417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17470308#comment-17470308
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Felix N commented on HDFS-16417:
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Hi [~elgoiri], sorry I was using the wrong formatter, hence the imports change.
I have submitted a PR with that addressed.
> RBF: StaticRouterRpcFairnessPolicyController init fails with division by 0 if
> concurrent ns handler count is configured
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-16417
> URL: https://issues.apache.org/jira/browse/HDFS-16417
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: rbf
> Reporter: Felix N
> Priority: Minor
> Labels: pull-request-available
> Attachments: HDFS-16417.001.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> If {{dfs.federation.router.fairness.handler.count.concurrent}} is configured,
> unassignedNS is thus empty and {{handlerCount % unassignedNS.size()}} will
> throw a /0 exception.
> Changed it to assigning extra handlers to concurrent ns in case it's
> configured.
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