On May 10, 2012, at 10:21 PM, Jun Rao <jun...@gmail.com> wrote:
> If broker A comes back, messages are routed back to A again. Ordering is > guaranteed within a partition, not cross partitions. Thanks. To clarify, partition here is the logical partition on each broker. So, The topic has two partitions (on broker A and B) and therefore ordering is not guaranteed. > > Jun > > On Thu, May 10, 2012 at 6:28 PM, xiaoyu wang <xiaoyu.w...@gmail.com> wrote: > >> OK. I was wrong. Hmm, assume messages all goes to broker A and was routed >> to broker B after A goes down.what happens when A comes back online? If I >> have a consumer that consumes the topic, is ordering guaranteed? If so, how >> does kafka guarantee ordering in this case? >> >> >> >> On Wed, May 9, 2012 at 6:17 PM, Jun Rao <jun...@gmail.com> wrote: >> >>> If you have a partitioner that always return 0, produce requests will >>> always be routed to 1 broker. However, if that broker goes down, the >>> requests will be routed to another broker. This is because the producer >>> only route requests to live partitions. >>> >>> Jun >>> >>> On Wed, May 9, 2012 at 5:57 PM, xiaoyu wang <xiaoyu.w...@gmail.com> >> wrote: >>> >>>> OK. I have the answer now. when I connect to brokers through zookeeper, >>> the >>>> record may go to any broker and the partitioner is for partition on the >>>> broker. >>>> >>>> On Wed, May 9, 2012 at 5:48 PM, xiaoyu wang <xiaoyu.w...@gmail.com> >>> wrote: >>>> >>>>> Thanks Jun. >>>>> >>>>> I think my question is if I have a program which produces a topic >> with >>> a >>>>> partitioner that always returns 0, does all the messages go the same >>>>> broker? If so, what happens if I restart the program, does the >> messages >>>>> still go the same broker? Note that all the connections are through >>>>> zookeeper. >>>>> >>>>> >>>>> Thanks, >>>>> >>>>> >>>>> >>>>> On Tue, May 8, 2012 at 5:37 PM, Jun Rao <jun...@gmail.com> wrote: >>>>> >>>>>> Xiaoyu, >>>>>> >>>>>> A simpler way to do that is to send all produce requests to 1 broker >>> and >>>>>> configure that broker to have 1 partition per topic. >>>>>> >>>>>> Jun >>>>>> >>>>>> On Tue, May 8, 2012 at 12:41 PM, xiaoyu wang <xiaoyu.w...@gmail.com >>> >>>>>> wrote: >>>>>> >>>>>>> Hello, >>>>>>> >>>>>>> I want to keep the order of record in my topic so I created the >>>> producer >>>>>>> with a partitioner that always returns 0. I have the following >>>> questions >>>>>>> >>>>>>> >>>>>>> - will my topic be stored in 1 broker only? >>>>>>> - If so, which broker does my topic go to? >>>>>>> - what happens if I change the partitioner later to e.g. random >>>>>>> partitoner? >>>>>>> >>>>>>> >>>>>>> Thanks, >>>>>>> >>>>>>> -Xiaoyu >>>>>>> >>>>>> >>>>> >>>>> >>>> >>> >>
