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From "Yiquan Zhou (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (KAFKA-4348) On Mac OS, KafkaConsumer.poll returns 0 when there are still messages on Kafka server
Date Wed, 26 Oct 2016 13:58:59 GMT

     [ https://issues.apache.org/jira/browse/KAFKA-4348?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yiquan Zhou updated KAFKA-4348:
-------------------------------
    Environment: Max OS X EI Capitan, Java 1.8.0_111  (was: Max OS X EI Capitan, Java 1.8.0_77)

> On Mac OS, KafkaConsumer.poll returns 0 when there are still messages on Kafka server
> -------------------------------------------------------------------------------------
>
>                 Key: KAFKA-4348
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4348
>             Project: Kafka
>          Issue Type: Bug
>          Components: consumer
>    Affects Versions: 0.9.0.0, 0.9.0.1, 0.10.0.1
>         Environment: Max OS X EI Capitan, Java 1.8.0_111
>            Reporter: Yiquan Zhou
>              Labels: consumer, mac, polling
>
> Steps to reproduce:
> 1. start the zookeeper and kafka server using the default properties from the distribution:

> $ bin/zookeeper-server-start.sh config/zookeeper.properties
> $ bin/kafka-server-start.sh config/server.properties 
> 2. create a Kafka consumer using the Java API KafkaConsumer.poll(long timeout). It polls
the records from the server every second (timeout set to 1000) and prints the number of records
polled. The code can be found here: https://gist.github.com/yiquanzhou/a94569a2c4ec8992444c83f3c393f596
> 3. use bin/kafka-verifiable-producer.sh to generate some messages: 
> $ bin/kafka-verifiable-producer.sh --topic connect-test --max-messages 200000 --broker-list
localhost:9092
> wait until all 200k messages are generated and sent to the server. 
> 4. Run the consumer Java code. In the output console of the consumer, we can see that
the consumer starts to poll some records, then it polls 0 records for several seconds before
polling some more. like this:
> polled 27160 records
> polled 0 records
> polled 0 records
> polled 0 records
> polled 0 records
> polled 0 records
> polled 26886 records
> polled 26886 records
> polled 0 records
> polled 0 records
> polled 0 records
> polled 0 records
> polled 0 records
> polled 26701 records
> polled 26214 records
> The impact of this bug is that it slows down the consumption of messages a lot. And if
an eventListener is attached to the idle event, it could be triggered even if there are still
messages on the server.
> It is only reproducible on Mac OS X but neither on Linux nor Windows.



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