Duo Zhang resolved HBASE-18390.
    Resolution: Fixed

I tried reverted to this commit

commit 4bd5f03d22be5f8ce09c1c67cfe5d1dcc603446a
Author: Chia-Ping Tsai <chia7...@gmail.com>
Date:   Thu Jul 13 19:37:15 2017 +0800

    HBASE-18365 Eliminate the findbugs warnings for hbase-common

The tests are still failing for me. So I do no think it is introduced by this 

And the actual problem is ToolProvider returns a null JavaCompiler. It seems 
that tools.jar is not on our classpath. If I manually add tools.jar then the 
tests work fine.

[~tedyu] You can open a new issue to address this.

> Sleep too long when finding region location failed
> --------------------------------------------------
>                 Key: HBASE-18390
>                 URL: https://issues.apache.org/jira/browse/HBASE-18390
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.3.1, 1.2.6, 1.1.11, 2.0.0-alpha-1
>            Reporter: Phil Yang
>            Assignee: Phil Yang
>             Fix For: 3.0.0, 1.4.0, 1.3.2, 1.5.0, 1.2.7, 2.0.0-alpha-2, 1.1.12
>         Attachments: HBASE-18390.v01.patch, HBASE-18390.v02.patch, 
> HBASE-18390.v03.patch
> If RegionServerCallable#prepare failed when getRegionLocation, the location 
> in this callable object is null. And before we retry we will sleep. However, 
> when location is null we will sleep at least 10 seconds. And the request will 
> be failed directly if operation timeout is less than 10 seconds. I think it 
> is no need to keep MIN_WAIT_DEAD_SERVER logic. Use backoff sleeping logic is 
> ok for most cases.

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