Hello Peter. Thank you for the reply.
Now I understand. I take a look at the " kafka.server,type=replica-fetcher-metrics" as well. Thanks, Yu Watanabe On Wed, Apr 11, 2018 at 4:48 PM, Peter Bukowinski <pmb...@gmail.com> wrote: > Hi Yu, > > The broker property ‘replica.fetch.wait.max.ms’ determines the longest > interval a follower should wait before issuing a fetch request of the > leader. In reality these usually happen much more frequently, but it > depends on the rate at which producers write to kafka topics (among other > factors). > > The request rate of all your replica fetchers is one of the metrics that > kafka reports. You can find it under > kafka.server,type=replica-fetcher-metrics. > Many metrics are published for each leader and for each fetcher assigned to > that leader (if you have more than one configured in the > num.replica.fetchers broker parameter). > > For one of my small 5-broker clusters, my follower request rates range > from 130 per second on the high end to 3 per second on the low end. I’ve > configured 16 fetchers. > > -- > Peter Bukowinski > > > On Apr 10, 2018, at 10:54 PM, Yu Watanabe <yu.w.ten...@gmail.com> wrote: > > > > Hello. > > > > I would like to ask question regarding to fetch request from follower to > > leader replica. > > > > According to on line document it describes the flow of how fetch requests > > are fetched for sync operation . > > > > https://kafka.apache.org/documentation/#replication > > > > "Followers consume messages from the leader just as a normal Kafka > consumer > > would and apply them to their own log. > > Having the followers pull from the leader has the nice property of > allowing > > the follower to naturally batch together log entries they are applying to > > their log." > > > > However, I could not find the interval or frequency of the fetch > request. > > How often does follower replica issues fetch request to leader ? > > > > Thanks, > > Yu > > > > -- > > Yu Watanabe > > 渡辺 裕 > > > > LinkedIn : jp.linkedin.com/in/yuwatanabe1 > -- Yu Watanabe 渡辺 裕 LinkedIn : jp.linkedin.com/in/yuwatanabe1
