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https://issues.apache.org/jira/browse/HBASE-7321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13537301#comment-13537301
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Jesse Yates commented on HBASE-7321:
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This strikes me as 'not really a snapshot' in that its very hard to reason
about what writes will or won't be included in the snapshot, from a client
perspective. To me (and maybe this is a group of 1) snapshot means 'at a point
in time', but this is a far more ragged form. Traditionally, I believe
snapshots are (the current state of the DB) - (uncommitted transactions), which
for our case would be mutations that haven't completed when the snapshot starts.
Because we don't coordinate between regionservers, we can't give 'a point in
time' as a reference, but rather a just a 'fuzzy' approximation (as you mention
in the review, its an optimization on copytable), and therefore I don't feel
that 'snapshot' is the best name for this operation as people could easily be
confused by this. I'd be ok if you went with 'Fuzzy Snapshot' and a decent
description (brings up case where we need to add a section to the refguide
about the different types of snapshots with good descriptions)
> Simple Flush Snapshot
> ---------------------
>
> Key: HBASE-7321
> URL: https://issues.apache.org/jira/browse/HBASE-7321
> Project: HBase
> Issue Type: Sub-task
> Reporter: Jonathan Hsieh
> Assignee: Jonathan Hsieh
> Attachments: hbase-7321.v2.patch, pre-hbase-7321.v2.patch
>
>
> This snapshot style just issues a region flush and then "snapshots" the
> region.
> This is a simple implementation that gives the equivalent of copytable
> consistency. While by most definitions of consistency if a client writes A
> and then write B to different region servers, only neither, only A, or both
> A+B writes should be present, this one allows the only B case.
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