Xiangyi Zhu created HDFS-16421:
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Summary: RouterRpcFairnessConstants remove ConcurrentNS
Key: HDFS-16421
URL: https://issues.apache.org/jira/browse/HDFS-16421
Project: Hadoop HDFS
Issue Type: Improvement
Components: rbf
Affects Versions: 3.4.0
Reporter: Xiangyi Zhu
Assignee: Xiangyi Zhu
When using the RouterRpcFairnessConstants strategy, if the NamNode rpc is slow
or does not respond, it is easy to use up the concurrent available handlers,
and the client will not be able to renewLease normally.
I think CONCURRENT_NS can be removed. When there is an rpc of CONCURRENT, we
traverse each NS to apply for the corresponding Handler, instead of just
applying for one Handler like CONCURRENT.
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