On three machines on the same subnet as the two cassandra nodes. On Apr 3, 2012, at 6:40 PM, Collard, David L (Dave) wrote:
> Where is your client running? > > -----Original Message----- > From: Jeff Williams [mailto:je...@wherethebitsroam.com] > Sent: Tuesday, April 03, 2012 11:09 AM > To: user@cassandra.apache.org > Subject: Re: Write performance compared to Postgresql > > Vitalii, > > Yep, that sounds like a good idea. Do you have any more information about how > you're doing that? Which client? > > Because even with 3 concurrent client nodes, my single postgresql server is > still out performing my 2 node cassandra cluster, although the gap is > narrowing. > > Jeff > > On Apr 3, 2012, at 4:08 PM, Vitalii Tymchyshyn wrote: > >> Note that having tons of TCP connections is not good. We are using async >> client to issue multiple calls over single connection at same time. You can >> do the same. >> >> Best regards, Vitalii Tymchyshyn. >> >> 03.04.12 16:18, Jeff Williams написав(ла): >>> Ok, so you think the write speed is limited by the client and protocol, >>> rather than the cassandra backend? This sounds reasonable, and fits with >>> our use case, as we will have several servers writing. However, a bit >>> harder to test! >>> >>> Jeff >>> >>> On Apr 3, 2012, at 1:27 PM, Jake Luciani wrote: >>> >>>> Hi Jeff, >>>> >>>> Writing serially over one connection will be slower. If you run many >>>> threads hitting the server at once you will see throughput improve. >>>> >>>> Jake >>>> >>>> >>>> >>>> On Apr 3, 2012, at 7:08 AM, Jeff Williams<je...@wherethebitsroam.com> >>>> wrote: >>>> >>>>> Hi, >>>>> >>>>> I am looking at cassandra for a logging application. We currently log to >>>>> a Postgresql database. >>>>> >>>>> I set up 2 cassandra servers for testing. I did a benchmark where I had >>>>> 100 hashes representing logs entries, read from a json file. I then >>>>> looped over these to do 10,000 log inserts. I repeated the same writing >>>>> to a postgresql instance on one of the cassandra servers. The script is >>>>> attached. The cassandra writes appear to perform a lot worse. Is this >>>>> expected? >>>>> >>>>> jeff@transcoder01:~$ ruby cassandra-bm.rb >>>>> cassandra >>>>> 3.170000 0.480000 3.650000 ( 12.032212) >>>>> jeff@transcoder01:~$ ruby cassandra-bm.rb >>>>> postgres >>>>> 2.140000 0.330000 2.470000 ( 7.002601) >>>>> >>>>> Regards, >>>>> Jeff >>>>> >>>>> <cassandra-bm.rb> >> >
