[jira] [Commented] (HBASE-1212) merge tool expects regions all have different sequence ids

["Jean-Marc Spaggiari (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-1212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13510670#comment-13510670 ] 

Jean-Marc Spaggiari commented on HBASE-1212:
--------------------------------------------

FYI, I'm facing this issue today while trying to merge all the regions of a table. I have created a 54 regions table, and while trying to merge all of them back into a single one I got this error. I'm able to reproduce it.
                
> merge tool expects regions all have different sequence ids
> ----------------------------------------------------------
>
>                 Key: HBASE-1212
>                 URL: https://issues.apache.org/jira/browse/HBASE-1212
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>
> Currently merging two regions, the merge tool will compare their sequence ids.  If same, it will decrement one.  It needs to do this because on region open, files are keyed by their sequenceid; if two the same, one will erase the other.
> Well, with the move to the aggregating hfile format, the sequenceid is written when the file is created and its no longer written into an aside file but as metadata on to the end of the file.  Changing the sequenceid is no longer an option.
> This issue is about figuring a solution for the rare case where two store files have same sequence id AND we want to merge the two regions.

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