Kafka guarantees messages ordering at partition level not across partitions at topic level. Having out of order reading maybe possible If your topic has more than one partition.
From: Subhash Sriram Sent: Thursday, 22 June, 21:37 Subject: Re: Kafka 0.10 - kafka console consumer not reading the data in order that it was published To: users@kafka.apache.org How many partitions are in your topic? On Thu, Jun 22, 2017 at 3:33 PM, karan alang wrote: > Hi All - > > version - kafka 0.10 > I'm publishing data into Kafka topic using command line, > and reading the data using kafka console consumer > > *Publish command ->* > > $KAFKA_HOME/bin/kafka-verifiable-producer.sh --topic mmtopic1 > --max-messages 100 --broker-list > localhost:9092,localhost:9093,localhost:9094,localhost:9095 > --producer.config $KAFKA_HOME/config/producer.properties > > *Console Consumer :* > > $KAFKA10_HOME/bin/kafka-console-consumer.sh --zookeeper localhost:2161 > --topic mmtopic1 --from-beginning > > What i see is that the Kafka consumer is not reading the data in sequence > i.e. the data on console is seen, but not in order it was published. > > Is that expected ? > what do i need to do to ensure the Kafka consumer reads the data in > sequence ? >
