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https://issues.apache.org/jira/browse/HBASE-21487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16745791#comment-16745791
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Hadoop QA commented on HBASE-21487:
-----------------------------------

| (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 
13s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  5s{color} 
| {color:red} HBASE-21487 does not apply to branch-2. 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 ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hbase:42ca976 |
| JIRA Issue | HBASE-21487 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12955335/HBASE-21487.branch-2.002.patch
 |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/15627/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> Concurrent modify table ops can lead to unexpected results
> ----------------------------------------------------------
>
>                 Key: HBASE-21487
>                 URL: https://issues.apache.org/jira/browse/HBASE-21487
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 3.0.0, 2.0.0
>            Reporter: Syeda Arshiya Tabreen
>            Priority: Major
>             Fix For: 2.2.0
>
>         Attachments: HBASE-21487.branch-2.002.patch, 
> HBASE-21487.branch-2.patch
>
>
> Concurrent  modifyTable or add/delete/modify columnFamily leads to incorrect 
> result. After HBASE-18893, The behavior of add/delete/modify column family 
> during concurrent operation is changed compare to branch-1.When  one client 
> is adding cf2 and another one cf3 .. In branch-1 final result will be 
> cf1,cf2,cf3 but now either cf1,cf2 OR cf1,cf3 will be the outcome depending 
> on which ModifyTableProcedure executed finally.Its because new table 
> descriptor is constructed before submitting the ModifyTableProcedure in 
> HMaster class and its not guarded by any lock.
> *Steps to reproduce*
> 1.Create table 't' with column family 'f1'
> 2.Client-1 and Client-2 requests to add column family 'f2' and 'f3' on table 
> 't' concurrently.
> *Expected Result*
> Table should have three column families(f1,f2,f3)
> *Actual Result*
> Table 't' will have column family either (f1,f2) or (f1,f3)



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