Hi Ted, Thanks for the prompt response. I've already had a look at HRegionServer.checkAndPut and the implementation looks quite straight forward. That's why I was wondering why the other 2 methods are not available...or planned (couldn't find Jira). Seems like a useful functionality.
Anyhow, I'm not allowed to make any source code modifications to the HBase installation (in production) so I reckon I'll have to find a workaround. This is my use case: Updating user counters by events. We may get (in rare cases) duplicate events. Should not count the duplicates. My initial thought was to have an event_id qualifier for each incoming event (with '1' value). By checking if event_id exists before incrementing I can avoid duplicates. Without the checkAndIncrement functionality I must make 2 round trips for each event (which doesn't make sense). Any ideas how I can solve this issue ? Thanks, Lior On Sat, Apr 27, 2013 at 4:23 PM, Ted Yu <yuzhih...@gmail.com> wrote: > Take a look at the following method in HRegionServer: > > public boolean checkAndPut(final byte[] regionName, final byte[] row, > final byte[] family, final byte[] qualifier, final byte[] value, > final Put put) throws IOException { > > You can create checkAndIncrement() in a similar way. > > Cheers > > On Sat, Apr 27, 2013 at 9:02 PM, Lior Schachter <lior...@gmail.com> wrote: > > > Hi, > > I want to increment a cell value only after checking a condition on > another > > cell. I could find checkAndPut/checkAndDelete on HTableInteface. It seems > > that checkAndIncrement (and checkAndAppend) are missing. > > > > Can you suggest a workaround for my use-case ? working with version > > 0.94.5. > > > > Thanks, > > Lior > > >