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https://issues.apache.org/jira/browse/HBASE-7801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13630940#comment-13630940
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Lars Hofhansl commented on HBASE-7801:
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Here's a list of changes I deliberately avoided in the 0.94 patch to keep it
small and low risk:
* Changing the coprocessor signature. The pre/post hooks still get only a
boolean indicating whether the entry written to the WAL or not
* Make HRegion.interalPut honor deferred sync. Currently internalPut does not
honor this at all (not even when set on the Table); it is use for checkAndPut.
This patch does not fix that.
* cleanup the Increment/Appand method signatures. These receive an Append (or
Increment) and also a writeToWAL boolean, even though the Append/Increment have
that boolean already.
If we wanted to change any of these, it should be a separate jira.
> 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, 7801-0.94-v6.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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