Anoop Sam John commented on HBASE-20141:

The concurrency issue (possible) while reopen, we will address in a follow up 
issue right?  If this works for your cluster as of now, pls go for the commit. 

> Fix TooManyFiles exception when RefreshingChannels in FileIOEngine
> ------------------------------------------------------------------
>                 Key: HBASE-20141
>                 URL: https://issues.apache.org/jira/browse/HBASE-20141
>             Project: HBase
>          Issue Type: Bug
>          Components: BucketCache
>    Affects Versions: 1.4.0, 2.0.0-beta-1, 1.4.2
>            Reporter: Zach York
>            Assignee: Zach York
>            Priority: Major
>         Attachments: HBASE-20141.master.001.patch, 
> HBASE-20141.master.002.patch, HBASE-20141.master.003.patch, 
> HBASE-20141.master.004.patch
> HBASE-19435 implements a fix for reopening file channels when they are 
> unnexpected closed
> to avoid disabling the BucketCache. However, it was missed that the the 
> channels might not
> actually be completely closed (the write or read channel might still be open
> (see 
> https://docs.oracle.com/javase/7/docs/api/java/nio/channels/ClosedChannelException.html)
> This commit closes any open channels before creating a new channel.

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