Hi, Thank you for replying.
We are using Java as the client library. This is the version: $ java -version openjdk version "14.0.1" 2020-04-14 OpenJDK Runtime Environment (build 14.0.1+7) OpenJDK 64-Bit Server VM (build 14.0.1+7, mixed mode, sharing) Is there any article where I can find out whether this Java version is KIP 392 compatible? For reference, this is the label that we have in our consumer pod: client.rack=us-east-1a So we are assuming that by having this label in the pod, this consumer pod will fetch data from the broker present in us-east-1a AZ. It would be helpful to know if we have to set this somewhere inside the pod as an environment variable as well. Thanks, On Wed, Oct 30, 2024 at 6:47 PM Ömer Şiar Baysal <osiarbay...@gmail.com> wrote: > Hi, > > The log shown on the blog post was for the console consumer tool. These > log messages emitted for the consumer process so you need to configure > log4j configuration for the kafka tools if you want to achieve the same > thing. > > The functionality provided by the KIP-392 is only realized only if client > implementation supports it. So the question is which library are you using > for the consumers? > > Regards, > OSB > > On Wed, Oct 30, 2024, 13:51 Soham Chakraborty <dec.so...@gmail.com> wrote: > > > Hi, > > > > We are trying to implement the feature from KIP 392 to allow consumers to > > fetch from the closest replica. We are using AWS and Kubernetes (kOps) > and > > the consumers do not always fetch from the broker in the same AZ, > resulting > > in cross AZ traffic cost. The entire purpose of this mail/exercise is to > > solve that. > > > > There is a very nice documentation from AWS which tells what and how to > do: > > > > > https://aws.amazon.com/blogs/big-data/reduce-network-traffic-costs-of-your-amazon-msk-consumers-with-rack-awareness/ > > > > We have followed all these steps: > > > > * added the two configuration parameters on kafka brokers (EC2 instances) > > * added a label `client.rack=<AZ_WHERE_THE_K8S_POD_IS_RUNNING>` to the > pod > > with an admission controller (kyverno - which mutates the pods during > > placement to nodes) > > > > After doing these, we expected the traffic cost to go down but AWS cost > > explorer thinks otherwise, which is why we are thinking that something > > might be wrong somewhere. To find out we are resorting to good ol logs > from > > kafka brokers. And that is the reason for this mail, we haven't been able > > to come up with a good logging configuration that shows us from where the > > consumers are fetching data. We are expecting to see something like what > > the blog article from AWS is saying: > > > > +++++ > > [2022-04-27 18:04:18,200] DEBUG [Consumer > > clientId=consumer-console-consumer-99846-1, > groupId=console-consumer-99846] > > Added READ_UNCOMMITTED fetch request for partition order-0 at position > > FetchPosition{offset=39, offsetEpoch=Optional[0], > > currentLeader=LeaderAndEpoch{leader=Optional[ > > b-1.mskcluster-msk.jcojml.c23.kafka.us-east-1.amazonaws.com:9092 (id: 1 > > rack: use1-az2)], epoch=0}} to node > > b-3.mskcluster-msk.jcojml.c23.kafka.us-east-1.amazonaws.com:9092 (id: 3 > > rack: use1-az1) (org.apache.kafka.clients.consumer.internals.Fetcher) > > +++++ > > > > We tried using the configuration provided in the article but that also > > didn't help out. > > > > This is our configuration: > > > > +++++ > > # ./kafka-topics.sh --version > > 2.8.0 (Commit:ebb1d6e21cc92130) > > > > # grep -v "^#" ../config/server.properties | grep . > > broker.id=11 > > broker.rack=us-east-1a > > num.network.threads=64 > > num.io.threads=8 > > socket.send.buffer.bytes=102400 > > socket.receive.buffer.bytes=102400 > > socket.request.max.bytes=104857600 > > message.max.bytes=10485760 > > log.dirs=/mnt/data/kafka > > num.partitions=1 > > num.recovery.threads.per.data.dir=4 > > offsets.topic.replication.factor=2 > > transaction.state.log.replication.factor=2 > > transaction.state.log.min.isr=1 > > delete.topic.enable=true > > auto.create.topics.enable=false > > log.retention.hours=24 > > log.segment.bytes=1073741824 > > log.retention.check.interval.ms=300000 > > zookeeper.connect=zk11.foo.bar.com,zk12.foo.bar.com,zk13.foo.bar.com, > > zk14.foo.bar.com,zk15.foo.bar.com > > zookeeper.connection.timeout.ms=6000 > > group.initial.rebalance.delay.ms=5000 > > replica.selector.class = > > org.apache.kafka.common.replica.RackAwareReplicaSelector > > > > # cat ../config/log4j.properties > > log4j.rootLogger=INFO,ROLLINGFILE > > > > log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender > > log4j.appender.CONSOLE.Threshold=WARN > > log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout > > log4j.appender.CONSOLE.layout.ConversionPattern=%c{35}:%L - %m%n > > > > log4j.appender.ROLLINGFILE=org.apache.log4j.RollingFileAppender > > log4j.appender.ROLLINGFILE.Threshold=INFO > > log4j.appender.ROLLINGFILE.File=/var/log/kafka/server.log > > log4j.appender.ROLLINGFILE.MaxFileSize=200MB > > log4j.appender.ROLLINGFILE.MaxBackupIndex=10 > > log4j.appender.ROLLINGFILE.layout=org.apache.log4j.PatternLayout > > log4j.appender.ROLLINGFILE.layout.ConversionPattern=%d %p [%t] %c{35}:%L > - > > %m%n > > > > log4j.logger.org.apache.kafka.clients.consumer.internals.Fetcher=DEBUG > > +++++ > > > > Can anyone please tell how we should customize the logging properties to > > see messages shown above. > > > > Thanks, > > >
