[jira] [Commented] (HBASE-21924) Region assignment will fail, if reference files are copied into new region while running HBCK -fixHdfsOverlaps command

["Syeda Arshiya Tabreen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-21924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16771793#comment-16771793 ] 

Syeda Arshiya Tabreen commented on HBASE-21924:
-----------------------------------------------

Not a problem.If any reference files are copied while  running *-fixHdfsOverlaps* command in the new region , region wont be asssigned until the reference files pointing to old region has been cleaned. The problem can be fixed through existing HBCK *-fixReferenceFiles* command.So not an issue

> Region assignment will fail, if reference files are copied into new region while running HBCK -fixHdfsOverlaps command
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-21924
>                 URL: https://issues.apache.org/jira/browse/HBASE-21924
>             Project: HBase
>          Issue Type: Bug
>          Components: hbck
>            Reporter: Syeda Arshiya Tabreen
>            Assignee: Syeda Arshiya Tabreen
>            Priority: Major
>
> Consider we have overlapping regions which contains reference files, 
>  when *-fixHdfsOverlaps* hbck command is run due to region overlap,a new region is created and all data is merged into the new region along with the reference files if present.
> For example:
>  1.create table 't' 
>  2.Insert records \{00,111,200} into the table 't'and flush the data
>  3.split the table 't' with split-key '100'
>  4.Now we have three regions( 1 parent and two daughter regions )
>  1.*parent_region*('Empty','Empty') => \{00,111,200}
>  2.*daughter_region-1*('Empty','100')=>\{00}
>  3.*daughter_region-2*('100','Empty')=>\{111,200}
> 5.Make sure parent_region is not deleted and also references of parent region are not cleaned for the daughter regions in file system and run *-fixHdfsOverlaps* command
> The command will copy all the data of overlapping regions along with the reference files into new_ region.
> Run *-fixMeta* command to fix meta issues.
> when *-fixAssignments* command is run to fix assignment issues in table,the new_region wont be assigned as reference files which is present in it will be pointing to the parent_region ( -fixHdfsOverlaps command will move all the data into new region and sideline the other overlapped regions) and it will try assigning the parent_region which does not exist.



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