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From <shalandra.sha...@barclays.com>
Subject RE: HBase checkAndPut Support
Date Wed, 20 Jul 2016 14:05:49 GMT
Thanks for the help and confirmation.

Thanks
Shal

-----Original Message-----
From: Jonathan Leech [mailto:jonathaz@gmail.com] 
Sent: Wednesday, July 20, 2016 0:35
To: user@phoenix.apache.org
Subject: Re: HBase checkAndPut Support

I suspect you could do what you want in an hbase coprocessor; however you would probably have
to take care to play nice with Phoenix. The gist of the coprocessor logic would be if the
value matches, incr it; otherwise don't update. Ideally you could throw an Exception and you
would get a meaningful SqlException at the client and no adverse effects such as secondary
index inconsistencies etc, do the right thing in a transaction, etc.

> On Jul 19, 2016, at 10:11 PM, Josh Elser <josh.elser@gmail.com> wrote:
> 
> Did you read James' response in PHOENIX-2271? [1]
> 
> Restating for you: as a work-around, you could try to use the recent transaction support
which was added via Apache Tephra to prevent multiple clients from modifying a cell. This
would be much less efficient than the "native" checkAndPut API call from HBase; however, I
cannot think of any other solution which exists in a released version of Apache Phoenix.
> 
> [1] 
> https://issues.apache.org/jira/browse/PHOENIX-2271?focusedCommentId=14
> 877306&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-ta
> bpanel#comment-14877306
> 
> shalandra.sharma@barclays.com wrote:
>> Hi team,
>> 
>> Any pointers/help?
>> 
>> Thanks
>> 
>> Shal
>> 
>> *From:*Sharma, Shalandra: IT (NYK)
>> *Sent:* Monday, May 23, 2016 11:25
>> *To:* 'user@phoenix.apache.org'
>> *Subject:* HBase checkAndPut Support
>> 
>> Hi Team,
>> 
>> We are evaluating use of Phoenix in our project. We are using CDH 5.5.2.
>> One of our use cases is to update the HBase row only if the value in 
>> a column (version) is greater than or equal to the current value. 
>> Using HBase core APIs we can achieve this by checkAndPut but I could 
>> not find any similar mechanism via Phoenix.
>> 
>> I have followed the discussion in the following JIRAs and it looks 
>> like this is something which will be available only in a future 
>> release. Can you please advise if there is a work around available 
>> otherwise it will be a blocker for us.
>> 
>> https://issues.apache.org/jira/browse/PHOENIX-2271
>> 
>> https://issues.apache.org/jira/browse/PHOENIX-2275
>> 
>> https://issues.apache.org/jira/browse/PHOENIX-2199
>> 
>> Thanks
>> 
>> *Shalandra Sharma*
>> 
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_______________________________________________

This message is for information purposes only, it is not a recommendation, advice, offer or
solicitation to buy or sell a product or service nor an official confirmation of any transaction.
It is directed at persons who are professionals and is not intended for retail customer use.
Intended for recipient only. This message is subject to the terms at: www.barclays.com/emaildisclaimer.

For important disclosures, please see: www.barclays.com/salesandtradingdisclaimer regarding
market commentary from Barclays Sales and/or Trading, who are active market participants;
and in respect of Barclays Research, including disclosures relating to specific issuers, please
see http://publicresearch.barclays.com.

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