Praveen Devarao created KAFKA-3044:
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Summary: Consumer.poll doesnot return messages when poll interval
is less
Key: KAFKA-3044
URL: https://issues.apache.org/jira/browse/KAFKA-3044
Project: Kafka
Issue Type: Bug
Components: clients
Affects Versions: 0.9.0.0
Reporter: Praveen Devarao
Fix For: 0.9.0.1
When seeking to particular position in consumer and starting poll with timeout
param 0 the consumer does not come back with data though there is data
published via a producer already. If the timeout is increased slowly in chunks
of 100ms then at 700ms value the consumer returns back the record on first call
to poll.
Docs
[http://kafka.apache.org/090/javadoc/org/apache/kafka/clients/consumer/KafkaConsumer.html#poll(long)]
for poll reads if timeout is 0 then data will be returned immediately but the
behaviour seen is that data is not returned.
The test code I am using can be found here
https://gist.github.com/praveend/013dcab01ebb8c7e2f2d
I have created a topic with data published as below and then running the test
program [ConsumerPollTest.java]
$ bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor
1 --partitions 1 --topic mytopic
$ bin/kafka-console-producer.sh --broker-list localhost:9092 --topic mytopic
Hello
Hai
bye
$ java ConsumerPollTest
I have published this 3 lines of data to kafka only once....later on I just use
the above program with different poll interval
Let me know if I am missing anything and interpreting it wrongly.
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