If you as a coprocessor are not writing back to your own region, you are probably doing it wrong.
On Thursday, December 6, 2012, Amit Sela wrote: > If I'm aggregating over the same Increment Object that triggered the > Observer (the same key, same CFs but aggregating into different > qualifiers), do I go outside the Region ? > I know that for the cases I mentioned earlier I do but in the case I > describe here don't I stay in the region ? > > > On Thu, Dec 6, 2012 at 9:40 AM, Andrew Purtell > <[email protected]<javascript:;>> > wrote: > > > Summing/aggregating with a Coprocessor seems like a fine use, but it > > should act upon only the data within the region to which it is > > associated. > > > > However if it seems your Coprocessor must unavoidably update or access > > data outside of its region, then either your schema design should > > change (such that all data the coprocessor will operate on is > > contained within the keyspace of the region); or, you should exclude > > all possible client side options. For example maybe Datacube will work > > for you here? See http://github.com/urbanairship/datacube > > > > On 12/6/12, Amit Sela <[email protected] <javascript:;>> wrote: > > > I asked because I thought exactly what you all said but wanted to be > > sure. > > > My case is incrementing counters per URL where the families are time > > > periods (hourly, daily...) and the qualifiers are > > > impressions_criteria1,impressions_criteria2... I am going to use > > > coprocessors in order to sum all impressions counters (all criteria > > > segments) and then increment another counter (general count) that > belongs > > > to the same URL. > > > Is that a good practice for Coprocessors (Observer) ? > > > > > > Thanks. > > > > > > > > > On Wed, Dec 5, 2012 at 8:56 PM, Asaf Mesika > > > <[email protected]<javascript:;> > > > > wrote: > > > > > >> Why not simply send Increment objects from the client side to HBase, > to > > >> the URL row key and to the domain row key? > > >> > > >> On 5 בדצמ 2012, at 14:35, Amit Sela <[email protected]<javascript:;>> > wrote: > > >> > > >> > Hi all, > > >> > > > >> > I have to count the occurrence of URLs in our system using the URL > as > > >> > row > > >> > key and using Increment. > > >> > I also want to count domains, so I was thinking of using > > RegionObserver > > >> > coprocessor on postIncrement() and Increment using the domain as > key. > > >> > > > >> > Will that work ? Is there a problem if the url key starts with > 'www.' > > >> > and > > >> > the domain starts with 'aaaa' ? > > >> > > > >> > Thanks, > > >> > > > >> > Amit. > > >> > > >> > > > > > > -- Best regards, - Andy Problems worthy of attack prove their worth by hitting back. - Piet Hein (via Tom White)
