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https://issues.apache.org/jira/browse/HBASE-7801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13576414#comment-13576414
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Anoop Sam John commented on HBASE-7801:
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bq.By setting defer sync you implicitly declare that you are OK with losing
(some of) the data in rare cases. If that is not acceptable you'd need sync
(not defer) I think.
Lars I dont need the defered sync in any of the mutation. So every mini batch
operation will do a wal write and then one sync at [STEP 7. Sync wal]
What my point was we have the LogSyncer thread running. It can come and do a
sync before the thread, doing the write, coming and doing the sync at step#7.
In our case we have to make sure the sync is happening as one unit for the main
region and index region. We do write WAL entry for the index region in CP WAL
write hooks.
bq.Maybe in 0.96 we can think about a way how group edits for different regions
(on the same server) and write them into a single WALEdit (similar to
RowMutations, but for multiple regions).
I was also thinking in this way. This is already a backlog item I have added
for myself here which comes in our sec index further optimization points :)
Thanks Lars. I will see working with item.
> 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
> Fix For: 0.96.0, 0.94.6
>
>
> 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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