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
