[jira] [Created] (KAFKA-2008) Update num.consumer.fetchers description in Kafka documentation

["TAO XIAO (JIRA)" <ji...@apache.org>]

TAO XIAO created KAFKA-2008:
-------------------------------

             Summary: Update num.consumer.fetchers description in Kafka documentation
                 Key: KAFKA-2008
                 URL: https://issues.apache.org/jira/browse/KAFKA-2008
             Project: Kafka
          Issue Type: Improvement
          Components: website
            Reporter: TAO XIAO


The description of num.consumer.fetchers currently shown in consumer config section of Kafka document is not accurate.

num.consumer.fetchers actually controls the max number of fetcher threads that can be created in consumer. The actual number of fetcher threads is controlled by the combination of topic, partition and num.consumer.fetchers

Reference source code in AbstractFetcherManager

private def getFetcherId(topic: String, partitionId: Int) : Int = {

    Utils.abs(31 * topic.hashCode() + partitionId) % numFetchers

  }



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)