Felix N created HDFS-16417:
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Summary: 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
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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