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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7801) Allow a deferred sync option per Mutation.
Date Thu, 14 Feb 2013 16:40:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13578472#comment-13578472
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Lars Hofhansl commented on HBASE-7801:
--------------------------------------

The use case that I see a lot at Saleforce is similar to the writeToWAL use case. By default
the Mutation is written to the WAL unless the Mutation says not to. The defer case is the
same IMHO.

Doing the reverse without making it confusing would require a "forceFlush" (or something like
this) option in the Mutation. So we'd have writeToWal, deferFlush, and forceFlush. Even then
IMHO that would be more confusing the helpful.

The key here is that it should possible to decide per Mutation whether to defer or not. Without
this change that is not possible. With this change it is possible by leaving the table's default
(flush) and then set the defer bit on a Mutation.

                
> 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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