[
https://issues.apache.org/jira/browse/HBASE-10241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13863531#comment-13863531
]
Enis Soztutar commented on HBASE-10241:
---------------------------------------
We need to fix this for a couple of different reasons:
- Fixing scanner consistency with multi-row transactions (see HBASE-9797)
- Adding cell-based scanners, and streaming scans
- Adding single-row scanners.
- Consistent scanners with region replicas in case replicas are mostly up to
date (HBASE-10070)
What is the plan here? I think we should do subtasks 1 and 3 regardless of
HBASE-8763. But it seems that if we do HBASE-8763 first, it will be much
cleaner and we won't need subtask 2 at all.
> 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.
--
This message was sent by Atlassian JIRA
(v6.1.5#6160)
