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Posted to issues@hbase.apache.org by "Sean Busbey (JIRA)" <ji...@apache.org> on 2016/01/11 23:35:39 UTC
[jira] [Updated] (HBASE-14465) Backport 'Allow rowlock to be
reader/write' to branch-1
[ https://issues.apache.org/jira/browse/HBASE-14465?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sean Busbey updated HBASE-14465:
--------------------------------
Release Note:
Locks on row are now reader/writer rather than exclusive.
Moves sequenceid out of HRegion and into MVCC class; MVCC is now in charge. A WAL append is still stamped in same way (we pass MVCC context in a few places where we previously we did not).
MVCC methods cleaned up. Make a bit more sense now. Less of them.
Simplifies our update of MemStore/WAL. Now we update memstore AFTER we add to WAL (but before we sync). This fixes possible dataloss when two edits came in with same coordinates; we could order the edits in memstore differently to how they arrived in the WAL.
Marked as an incompatible change because it breaks Distributed Log Replay, a feature we'd determined already was unreliable and to be removed (See http://search-hadoop.com/m/YGbbhTJpoal8GD1).
was:See parent issue.
> Backport 'Allow rowlock to be reader/write' to branch-1
> -------------------------------------------------------
>
> Key: HBASE-14465
> URL: https://issues.apache.org/jira/browse/HBASE-14465
> Project: HBase
> Issue Type: Sub-task
> Components: regionserver
> Reporter: stack
> Assignee: stack
> Fix For: 1.2.0, 1.3.0
>
> Attachments: 14465.branch-1.txt, 14465.branch-1.v2.txt, 14465.branch-1.v2.txt, 14465.branch-1.v2.txt, 14465.branch-1.v3.txt, 14465.branch-1.v3.txt, 14465.branch-1.v4.txt, 14465.branch-1.v4.txt, 14465.branch-1.v4.txt, 14465.branch-1.v5.txt, 14465.branch-1.v5.txt, 14465.branch-1.v9.txt, 14465.branch-1.v9.txt, 14465.branch-1.v9.txt, 14465.txt
>
>
> Backport to branch-1.
> You want this in 1.2 [~busbey]? Its cleanup and fixes a possible dataloss. On other hand, its a bit of refactoring.
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