Mark
On Jul 28, 2012, at 10:55, Parnell Springmeyer <ixma...@gmail.com> wrote: > The client might not support that, I don't know. I know the Python client (at > least the version I'm using) also does a full GET of the object. > > Here's the kicker though, I'm using LevelDB for the backend and LevelDB is > notorious for having poor read performance when you're trying to GET a key > that doesn't exist (checking for existence). So, don't do it if you're using > LevelDB. > It's worth noting that the version of LevelDB in 1.2 (which will be official Very Soon Now) will have much more efficient not-found look ups thanks to the addition of bloom filters [1]. I don't have the actual performance data handy but we should be posting some info on that other improvements on the blog before too long. Don't give up on Level just yet :) Mark [1] https://github.com/basho/riak/blob/1.2/RELEASE-NOTES.md > Bitcask is another story though, since all the keys are in memory so that > lookup is constant time (I believe, unless your key space is going into swap, > but that shouldn't happen). > > On Jul 28, 2012, at 11:44 AM, Ukyo Virgden wrote: > >> Hi, >> >> Just installed riak and trying to get adjusted. Having looked at the java >> client, I could not tell if there' a way to check key exixtence. What I need >> to do is to check if a key exists and put it if it doesn't. In HTTP request >> from curl, a HEAD request instead of a GET gives the result I need. >> >> How can I check the existence of a key from java client without making a >> full fetch? >> >> Thanks. >> _______________________________________________ >> riak-users mailing list >> riak-users@lists.basho.com >> http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com > > _______________________________________________ > riak-users mailing list > riak-users@lists.basho.com > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com _______________________________________________ riak-users mailing list riak-users@lists.basho.com http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
