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https://issues.apache.org/jira/browse/HBASE-22039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16791522#comment-16791522
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Hadoop QA commented on HBASE-22039:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  2m 10s{color} 
| {color:red} HBASE-22039 does not apply to master. Rebase required? Wrong 
Branch? See https://yetus.apache.org/documentation/0.8.0/precommit-patchnames 
for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HBASE-22039 |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/16376/console |
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> Should add the synchronous parameter for the XXXSwitch method in AsyncAdmin
> ---------------------------------------------------------------------------
>
>                 Key: HBASE-22039
>                 URL: https://issues.apache.org/jira/browse/HBASE-22039
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Admin, asyncclient, Client
>            Reporter: Duo Zhang
>            Assignee: Duo Zhang
>            Priority: Major
>             Fix For: 3.0.0, 2.2.0, 2.3.0
>
>         Attachments: HBASE-22039-v1.patch, HBASE-22039.patch
>
>
> For now we always pass true to HMaster, maybe the decision is that user just 
> do not need to calling get on the returned Future if it wants asynchronous.
> But the problem here is that, the return value is not void, it is a boolean, 
> which is the previous state of the flag, sometimes users do not need to wait 
> until the previous transitions or split/merge to complete, but they still 
> want to get the previous value of the flag.
> So we still need to provide the synchronous parameter.



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