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https://issues.apache.org/jira/browse/HBASE-12542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16071031#comment-16071031
 ] 

Hadoop QA commented on HBASE-12542:
-----------------------------------

| (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:blue}0{color} | {color:blue} patch {color} | {color:blue}  0m  
3s{color} | {color:blue} The patch file was not named according to hbase's 
naming conventions. Please see 
https://yetus.apache.org/documentation/0.4.0/precommit-patchnames for 
instructions. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  7s{color} 
| {color:red} HBASE-12542 does not apply to master. Rebase required? Wrong 
Branch? See https://yetus.apache.org/documentation/0.4.0/precommit-patchnames 
for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HBASE-12542 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12682839/HBASE-12542-v1.diff |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/7436/console |
| Powered by | Apache Yetus 0.4.0   http://yetus.apache.org |


This message was automatically generated.



> Delete a family of table online will crash regionserver 
> --------------------------------------------------------
>
>                 Key: HBASE-12542
>                 URL: https://issues.apache.org/jira/browse/HBASE-12542
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>            Reporter: Liu Shaohui
>            Assignee: Liu Shaohui
>            Priority: Critical
>             Fix For: 2.0.0
>
>         Attachments: HBASE-12542-v1.diff
>
>
> Using alter command to delete a family of table online will make the 
> regionsevers that serve the regions of the table crash.
> {code}
> alter 't', NAME => 'f', METHOD => 'delete'
> {code}
> The reason is that TableDeleteFamilyHandler in HMaster delete the family dir 
> firstly and then reopen all the regions of table.
> When the regionserver reopen the region, it will crash for the exception in 
> flushing memstore to hfile of the deleted family during closing the region, 
> because the parent dir of the hfile has been deleted in 
> TableDeleteFamilyHandler.
> See: TableDeleteFamilyHandler.java #57
> A simple solution is change the order of operations in 
> TableDeleteFamilyHandler.
> - update table descriptor first, 
> - reopen all the regions,
> - delete the the family dir at last.
> Suggestions are welcomed.



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