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https://issues.apache.org/jira/browse/HDFS-16417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17470026#comment-17470026
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Íñigo Goiri commented on HDFS-16417:
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Thanks [~coconut_icecream] for the patch.
Do you mind creating a PR instead?
Let's keep the imports expanded too and avoided churn changing the order.
> 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
> Attachments: HDFS-16417.001.patch
>
>
> 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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