[HDFS-16417] RBF: StaticRouterRpcFairnessPolicyController init fails with division by 0 if concurrent ns handler count is configured

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 3.4.0
• Component/s: rbf
• Labels: pull-request-available
• Assignee: Felix N
• Reporter: Felix N
• Created: 06/Jan/22 11:11
• Updated: 10/Jan/22 10:33
• Resolved: 10/Jan/22 10:33

Description

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.

Issue Links

• links to: GitHub Pull Request #3871