For #1, yes, a server restart is needed to pick up the new config. For #2, which version of Kafka are your using?
Thanks, Jun On Fri, May 3, 2013 at 1:55 PM, Yu, Libo <libo...@citi.com> wrote: > More detail for question 2: > For 5 topic case, 20 producers produce to each topic. > For 10 topic case, 10 producers produce to each topic. > > Libo > > From: Yu, Libo [ICG-IT] > Sent: Friday, May 03, 2013 4:48 PM > To: 'users@kafka.apache.org' > Subject: a few questions about kafka usage > > Hi, > > Question 1: If I changed server.properties and added or modified the > following line: > log.flush.intervals.ms.per.topic=topic1:1000, > topic2:3000 > Do I have to restart the server to pick up the > change? > > Question 2: I have three machines with one broker on each of them. 100 > producers are > running on the same three machines. The producers > will produce 1M > 20k-byte messages altogether. The batch size is > fixed at 100. For 5 topics > each with five partitions, the performance is > extremely good. For each topic, > 30k messages were produced per second . For 10 topics > with 10 partitions, > the performance is really bad. For each topic, 400 > messages were produced > per second. The gap is so huge. Any insight on what > may cause the difference? > > Regards, > > Libo > >
