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https://issues.apache.org/jira/browse/HBASE-8458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17069125#comment-17069125
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Toshihiro Suzuki commented on HBASE-8458:
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[~stack] Thank you taking a look at this!
Please find my inline answers below:
> Old clients will work against new servers with this patch across all of their
> API? checkAndMutate with RM too? Or will checkAndMutate break after this
> patch goes in?
Yes, old clients will work against new servers with this patch across all of
their API. And checkAndMutate with RM too.
> New clients will break against servers w/o this patch? For checkAndMutate
> only?
New clients will break against servers w/o this patch for checkAndMutate with
RM and mutateRow.
> For rolling upgrade, we'd do servers first? Old clients wouldn't be able to
> make use of this new facility. We'd then roll out the new clients and they
> could then use the new batching?
Yes, that's right. For rolling upgrade, we will need to upgrade servers first,
and then roll out the new clients.
Thanks.
> Support for batch version of checkAndPut() and checkAndDelete()
> ---------------------------------------------------------------
>
> Key: HBASE-8458
> URL: https://issues.apache.org/jira/browse/HBASE-8458
> Project: HBase
> Issue Type: Improvement
> Components: Client, regionserver
> Affects Versions: 0.95.0
> Reporter: Hari Mankude
> Assignee: Toshihiro Suzuki
> Priority: Major
>
> The use case is that the user has multiple threads loading hundreds of keys
> into a hbase table. Occasionally there are collisions in the keys being
> uploaded by different threads. So for correctness, it is required to do
> checkAndPut() instead of a put(). However, doing a checkAndPut() rpc for
> every key update is non optimal. It would be good to have a batch version of
> checkAndPut() similar to batch put(). The client can partition the keys on
> region boundaries.
> The jira is NOT looking for any type of cross-row locking or multi-row
> atomicity with checkAndPut()
> Batch version of checkAndDelete() is a similar requirement.
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