Does the Caasandra performance start fast and slow down (indicating some buffer being filled) or does it start slow and stay slow?
On Mon, May 10, 2010 at 2:05 AM, David Boxenhorn <da...@lookin2.com> wrote: > I read something like 80,000 rows from Oracle and write them to Cassandra in > chunks of 1000 rows - so I'm supposedly working to Cassandra's strength and > Oracle's weakness. > > Reading 1000 rows from Oracle is "instantaneous", writing them takes maybe > 30 seconds. Not too much data per row, maybe 1K. > > > > On Mon, May 10, 2010 at 11:48 AM, Ran Tavory <ran...@gmail.com> wrote: >> >> Hector uses tsocket. not sure what you mean by "buffered" - is that >> framed? Hector by default does not use framed. >> The code is here if you'd like to have a >> look http://github.com/rantav/hector/blob/master/src/main/java/me/prettyprint/cassandra/service/CassandraClientFactory.java#L77 >> However, I find it hard to believe that the actual connection is the >> slowing factor. >> Roughly speaking, cassandra is fast on writes and slow on reads. Exact >> numbers are per-scenario so it's hard to say, but if you only write and >> objects are small then from my experience you should expect a few k writes >> per second on a single host. How much do you see? >> There are many configuration factors and they all depend on expected usage >> and available h/w. >> >> On Mon, May 10, 2010 at 11:27 AM, vd <vineetdan...@gmail.com> wrote: >>> >>> What is the complete code string you are using to connect with cassandra >>> from Java code >>> >>> >>> >>> On Mon, May 10, 2010 at 1:49 PM, David Boxenhorn <da...@lookin2.com> >>> wrote: >>>> >>>> I don't know what "TSocket or the buffered one" means. Maybe I should >>>> know? >>>> >>>> I'm using Hector. Does that explain anything? >>>> >>>> On Mon, May 10, 2010 at 11:15 AM, vd <vineetdan...@gmail.com> wrote: >>>>> >>>>> Hi >>>>> >>>>> what is it that you are using to connect with cassnadra TSocket or the >>>>> buffered one ? >>>>> >>>>> >>>>> ____________________________________ >>>>> >>>>> _______________________________________ >>>>> >>>>> >>>>> >>>>> On Mon, May 10, 2010 at 1:29 PM, David Boxenhorn <da...@lookin2.com> >>>>> wrote: >>>>>> >>>>>> I'm running Java on the client, jdbc queries on Oracle, Hector on >>>>>> Cassandra. >>>>>> >>>>>> The Cassandra and Oracle database designs are radically different, as >>>>>> you might guess. >>>>>> >>>>>> I have no doubt that Cassandra can be tuned, in a multiple-server >>>>>> cluster, to have superior throughput (that's why I'm doing it!). But for >>>>>> now, it's really frustrating my development effort that Cassandra is so >>>>>> slow. Can't I get it up to twice as slow as Oracle in my configuration? >>>>>> >>>>>> On Mon, May 10, 2010 at 10:47 AM, vd <vineetdan...@gmail.com> wrote: >>>>>>> >>>>>>> Hi David >>>>>>> >>>>>>> If I may ask...how do you plan to import data from oracle to >>>>>>> cassandra ? >>>>>>> As answer AFAIK cassandra's true ability comes into play when running >>>>>>> on more than one machine...and please share how you are making >>>>>>> comparisons >>>>>>> like on writes or reads from cassandra. >>>>>>> >>>>>>> >>>>>>> >>>>>>> _______________________________________ >>>>>>> _______________________________________ >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Mon, May 10, 2010 at 1:04 PM, David Boxenhorn <da...@lookin2.com> >>>>>>> wrote: >>>>>>>> >>>>>>>> I'm running Oracle and Cassandra on my machine, trying to import my >>>>>>>> data to Cassandra from Oracle. >>>>>>>> >>>>>>>> In my configuration Oracle is about ten times faster than Cassandra. >>>>>>>> Cassandra has out-of-the-box tuning. >>>>>>>> >>>>>>>> I am new to Cassandra. How do I begin trying to tune it? >>>>>>>> >>>>>>>> Thanks. >>>>>>> >>>>>> >>>>> >>>> >>> >> > >
