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https://issues.apache.org/jira/browse/HBASE-10241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13863546#comment-13863546
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Sergey Shelukhin commented on HBASE-10241:
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Subtask 2 is trivial; the reason it is not done is that it is being done
elsewhere (see how it's resolved as dup), so since it's not blocking us here
and now it doesn't make sense to do double work. I am not working on this jira
right now (will get back to it hopefully and there's a patch out in client
subtask), but the plan was that I will do 1 and 3, and then take 2 if the other
JIRA that does 2 is not done by then.
HBASE-8763 does not need to block this, it's probably bigger than this entire
JIRA. If it's done before this due to delays, good, if not, also good :)
> implement mvcc-consistent scanners (across recovery)
> ----------------------------------------------------
>
> Key: HBASE-10241
> URL: https://issues.apache.org/jira/browse/HBASE-10241
> Project: HBase
> Issue Type: New Feature
> Components: HFile, regionserver, Scanners
> Affects Versions: 0.99.0
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: Consistent scanners.pdf
>
>
> Scanners currently use mvcc for consistency. However, mvcc is lost on server
> restart, or even a region move. This JIRA is to enable the scanners to
> transfer mvcc (or seqId, or some other number, see HBASE-8763) between
> servers. First, client scanner needs to get and store the readpoint. Second,
> mvcc needs to be preserved in WAL. Third, the mvcc needs to be stored in
> store files per KV and discarded when not needed.
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