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https://issues.apache.org/jira/browse/HBASE-1212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13564071#comment-13564071
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chunhui shen commented on HBASE-1212:
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We will use sequenceId to sort HFiles, like in compaction.
When merging, there is no overlap between these two files from different
regions, I think it's ok even if two files have the same sequence ID since we
don't use it to distingush the files in Store any more
Patch looks good for me
> 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
> Assignee: Jean-Marc Spaggiari
> Attachments: failure.log, HBASE-1212.patch, HBASE-1212-v2.patch,
> HBASE-1212-v3-trunk.patch
>
>
> 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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