Chao Sun commented on HDFS-13230:

Yes, I was going to complete that. The approach I was thinking is to initialize 
the pool with a positive {{minSize}}, make at least half of them active, and 
then try to do cleanup. However, I can't make more than one connection active 
because of HDFS-13232. I've synced with Ekanth and he will add the test in that 

> RBF: ConnectionManager's cleanup task will compare each pool's own active 
> conns with its total conns
> ----------------------------------------------------------------------------------------------------
>                 Key: HDFS-13230
>                 URL: https://issues.apache.org/jira/browse/HDFS-13230
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Wei Yan
>            Assignee: Chao Sun
>            Priority: Minor
>         Attachments: HDFS-13230.000.patch
> In the cleanup task:
> {code:java}
> long timeSinceLastActive = Time.now() - pool.getLastActiveTime();
> int total = pool.getNumConnections();
> int active = getNumActiveConnections();
> if (timeSinceLastActive > connectionCleanupPeriodMs ||
> {code}
> the 3rd line should be pool.getNumActiveConnections()

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