Hi Jerry, Out of curiosity, what is your use-case? How do you want to use this?
Also, I guess, feel free to file a jira issue for this functionality (I believe there's no such yet) . Alex Baranau ------ Sematext :: http://sematext.com/ :: Hadoop - HBase - ElasticSearch - Solr On Tue, Aug 7, 2012 at 11:55 AM, lars hofhansl <[email protected]> wrote: > There is no such functionality currently, and there is no good way to > simulate that. > > Currently that cannot even be done with a coprocessor endpoint, because > region coprocessors have no way to create a region lock (just checked the > code). > (That is something we have to change I think - I will create an issue once > the Jira system is back from the walk in the park). > > -- Lars > > > ----- Original Message ----- > From: Jerry Lam <[email protected]> > To: user <[email protected]> > Cc: > Sent: Tuesday, August 7, 2012 8:22 AM > Subject: CheckAndAppend Feature > > Hi HBase community: > > I checked the HTable API, it has checkAndPut and checkAndDelete but I'm > looking for checkAndAppend. Is there a way to simulate similarly? > For instance, I want to check the last 32 bytes of a value (let assume that > it has 128 bytes in total) in a column before appending atomically some > values into it. > > Thanks! > > Jerry > > -- Alex Baranau ------ Sematext :: http://blog.sematext.com/ :: Hadoop - HBase - ElasticSearch - Solr
