Re: Limit on number of Kafka Topic

2013-03-27 Thread Matthew Rathbone
We've seen big performace degradation when we tested 1024 topics, so we've opted to go for a much smaller topic count (< 100). On the read side, I think performance is largely driven by the ability of the operating system to effectively cache access to #partitions*topic files. Clearly if you divid

Re: Limit on number of Kafka Topic

2013-03-27 Thread Jun Rao
With more topics, you may hit one of those limits: (1) # dirs allowed in a FS; (2) open file handlers (we keep all log segments open in the broker); (3) ZK nodes. Thanks, Jun On Wed, Mar 27, 2013 at 8:36 AM, Jason Huang wrote: > Just curious - I don't see any limit in the # of topics that you

Re: Limit on number of Kafka Topic

2013-03-27 Thread Jason Huang
Just curious - I don't see any limit in the # of topics that you can have in a Kafka cluster. So in principle, you could have as many topics as you want, so long as your hardware can keep up, right? Jason On Wed, Mar 27, 2013 at 11:33 AM, Jun Rao wrote: > At LinkedIn, our largest cluster has mo

Re: Limit on number of Kafka Topic

2013-03-27 Thread Jun Rao
At LinkedIn, our largest cluster has more than 2K topics. 5K topics should be fine. Thanks, Jun On Tue, Mar 26, 2013 at 11:52 PM, Suyog Rao wrote: > Hello, > > Wanted to check if there is any known limit on the # of topics in a Kafka > cluster? I wanted to design a system which has say 5k topi

Limit on number of Kafka Topic

2013-03-26 Thread Suyog Rao
Hello, Wanted to check if there is any known limit on the # of topics in a Kafka cluster? I wanted to design a system which has say 5k topics and multi-threaded consumers reading messages from these topics. Does anyone have experience with such large topic size? I see in Kafka's page a test for th