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https://issues.apache.org/jira/browse/HBASE-12485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14213396#comment-14213396
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stack commented on HBASE-12485:
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Good one [~jeffreyz] (you know sequenceid is my favorite subject!)
> Maintain SeqId monotonically increasing when Region Replica is on
> -----------------------------------------------------------------
>
> Key: HBASE-12485
> URL: https://issues.apache.org/jira/browse/HBASE-12485
> Project: HBase
> Issue Type: Sub-task
> Reporter: Jeffrey Zhong
> Assignee: Jeffrey Zhong
>
> We added FLUSH, REGION CLOSE events into WAL, for each those events the
> region SeqId is bumped.
> The issue comes from region close operation. Because when opening a region,
> we use flushed SeqId from store files while after store flush during region
> close we still write COMMIT_FLUSH, REGION_CLOSE events etc which respectively
> bump up SeqId. Therefore, the region opening SeqId is lower than it should
> be.
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