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https://issues.apache.org/jira/browse/HBASE-7801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13630930#comment-13630930
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Lars Hofhansl commented on HBASE-7801:
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bq. I think we should add to javadoc for ASYNC_WAL that table descriptor
setting is not considered.
I think you misunderstand the setting. That's the case that Anoop needs where
the deferred log flusher is disabled completely. In the case we also do not
honor the table's settings, but flush everything synchronously, since otherwise
it will never get flushed. In that case the RegionServer will log a warning on
startup.
> 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
> Affects Versions: 0.94.6, 0.95.0
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Fix For: 0.98.0, 0.94.7, 0.95.1
>
> Attachments: 7801-0.94-v1.txt, 7801-0.94-v2.txt, 7801-0.94-v3.txt,
> 7801-0.94-v4.txt, 7801-0.94-v5.txt, 7801-0.96-full-v2.txt,
> 7801-0.96-full-v3.txt, 7801-0.96-full-v4.txt, 7801-0.96-full-v5.txt,
> 7801-0.96-v10.txt, 7801-0.96-v1.txt, 7801-0.96-v6.txt, 7801-0.96-v7.txt,
> 7801-0.96-v8.txt, 7801-0.96-v9.txt, hbase-7801-addendum.patch
>
>
> 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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