caixiaofeng commented on HDFS-12967:

mark, it looks like a good function.

> NNBench should support multi-cluster access
> -------------------------------------------
>                 Key: HDFS-12967
>                 URL: https://issues.apache.org/jira/browse/HDFS-12967
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: benchmarks
>            Reporter: Chen Zhang
>            Assignee: Chen Zhang
>            Priority: Major
>         Attachments: HDFS-12967-001.patch
> Sometimes we need to run NNBench for some scaling tests after made some 
> improvements on NameNode, so we have to deploy a new HDFS cluster and a new 
> Yarn cluster.
> If NNBench support multi-cluster access, we only need to deploy a new HDFS 
> test cluster and add it to existing YARN cluster, it'll make the scaling test 
> easier.
> Even more, if we want to do some A-B test, we have to run NNBench on 
> different HDFS clusters, this patch will be helpful.

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