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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5203) Group atomic put/delete operation into a single WALEdit to handle region server failures.
Date Mon, 16 Jan 2012 19:07:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13187091#comment-13187091
] 

Lars Hofhansl commented on HBASE-5203:
--------------------------------------

@Ram: added a new patch to RB. Only change is wrapping the whole operation in try/finally
and running the postHooks outside the finally blocks (but still after the mvcc is rolled forward
and the regionlock was released). Otherwise the patch is identical.
Please have a look. Thanks.
                
> Group atomic put/delete operation into a single WALEdit to handle region server failures.
> -----------------------------------------------------------------------------------------
>
>                 Key: HBASE-5203
>                 URL: https://issues.apache.org/jira/browse/HBASE-5203
>             Project: HBase
>          Issue Type: Sub-task
>          Components: client, coprocessors, regionserver
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.94.0
>
>         Attachments: 5203.txt
>
>
> HBASE-3584 does not not provide fully atomic operation in case of region server failures
(see explanation there).
> What should happen is that either (1) all edits are applied via a single WALEdit, or
(2) the WALEdits are applied in async mode and then sync'ed together.
> For #1 it is not clear whether it is advisable to manage multiple *different* operations
(Put/Delete) via a single WAL edit. A quick check reveals that WAL replay on region startup
would work, but that replication would need to be adapted. The refactoring needed would be
non-trivial.
> #2 Might actually not work, as another operation could request sync'ing a later edit
and hence flush these entries out as well.

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