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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7801) Allow a deferred sync option per Mutation.
Date Thu, 14 Feb 2013 07:44:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13578205#comment-13578205
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ramkrishna.s.vasudevan commented on HBASE-7801:
-----------------------------------------------

Yes right Lars.  
If the Log syncer is on, suppose thro the WALObserver we have done a WAL edit and in the main
flow we do another WAlEdit but both needs to be synced together as atomic, then we need to
the logsyncer to be disabled.
Or else the logsyncer may sync up the first Edit that happened thro WALObserver and then when
the main sync happens there could be a failure leading to inconsistency.
                
> Allow a deferred sync option per Mutation.
> ------------------------------------------
>
>                 Key: HBASE-7801
>                 URL: https://issues.apache.org/jira/browse/HBASE-7801
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.96.0, 0.94.6
>
>         Attachments: 7801-0.94-v1.txt
>
>
> Won't have time for parent. But a deferred sync option on a per operation basis comes
up quite frequently.
> In 0.96 this can be handled cleanly via protobufs and 0.94 we can have a special mutation
attribute.
> For batch operation we'd take the safest sync option of any of the mutations. I.e. if
there is at least one that wants to be flushed we'd sync the batch, if there's none of those
but at least one that wants deferred flush we defer flush the batch, etc.

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