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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-19154) Scan consistency guarantee
Date Mon, 20 Nov 2017 12:30:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-19154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16259184#comment-16259184
] 

Duo Zhang commented on HBASE-19154:
-----------------------------------

Do not have much time to do this. Let's do it after 2.0 release.

> Scan consistency guarantee
> --------------------------
>
>                 Key: HBASE-19154
>                 URL: https://issues.apache.org/jira/browse/HBASE-19154
>             Project: HBase
>          Issue Type: Umbrella
>          Components: Compaction, scan
>    Affects Versions: 3.0.0
>            Reporter: Duo Zhang
>
> For now, although we already pass mvcc back to client, and client will send this mvcc
to RS when reopening a scanner, we still can not make sure that the region/row level consistency
is safe as compaction happens after region move but before the scanner reopen may delete some
cells which mvcc are before the mvcc given by client.
> This issue aims to try our best to guarantee region level consistency, and if not, we
need to tell users we can not make it.



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