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From "Ewen Cheslack-Postava (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (KAFKA-4402) Kafka Producer's DefaultPartitioner is actually not round robin as said in the code comments "If no partition or key is present choose a partition in a round-robin fashion"
Date Mon, 09 Jan 2017 04:08:58 GMT

     [ https://issues.apache.org/jira/browse/KAFKA-4402?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ewen Cheslack-Postava resolved KAFKA-4402.
------------------------------------------
       Resolution: Fixed
    Fix Version/s: 0.10.2.0

Issue resolved by pull request 2128
[https://github.com/apache/kafka/pull/2128]

> Kafka Producer's DefaultPartitioner is actually not round robin as said in the code comments
"If no partition or key is present choose a partition in a round-robin fashion"
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: KAFKA-4402
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4402
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: Jun Yao
>            Priority: Minor
>             Fix For: 0.10.2.0
>
>
> From this code comments, it is said that Kafka client  Producer's DefaultPartitioner
will do round robin if "no partition or key is present", 
> https://github.com/apache/kafka/blob/41e676d29587042994a72baa5000a8861a075c8c/clients/src/main/java/org/apache/kafka/clients/producer/internals/DefaultPartitioner.java#L34
> from the code it looks trying to do round robin as well, as it maintained a counter and
try to increase it every time and then will decide which partition to go to; 
> However the issue here is the counter is a global counter that is shared by all the topics,
so  it is actually not round robin per topic and sometimes caused unbalanced routing among
different partitions. 
> Although we can pass a custom implementation of interface "org.apache.kafka.clients.producer.Partitioner",
it might be still good to make the default implementation true round robin as comment. 



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