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https://issues.apache.org/jira/browse/HBASE-12485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14234649#comment-14234649
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stack commented on HBASE-12485:
-------------------------------
Throw exception rather than WARN.
3547 LOG.warn("Found decreasing SeqId. PreId=" +
currentEditSeqId + " key=" + key
3548 + "; edit=" + val);
It will never happen, right? (smile)
I did not realize we were writing a file into region with the sequenceid.
Better than into zk I'd say. Should the special file instead be named with a
dot prefix like other special files (see head of HRegionFileSystem for list --
.regioninfo, .tmp, etc.)
> Maintain SeqId monotonically increasing
> ---------------------------------------
>
> Key: HBASE-12485
> URL: https://issues.apache.org/jira/browse/HBASE-12485
> Project: HBase
> Issue Type: Sub-task
> Reporter: Jeffrey Zhong
> Assignee: Jeffrey Zhong
> Fix For: 1.0.0, 2.0.0
>
> Attachments: HBASE-12485.patch
>
>
> 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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