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

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

     [ https://issues.apache.org/jira/browse/KAFKA-2008?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

TAO XIAO updated KAFKA-2008:
----------------------------
    Affects Version/s: 0.8.2.0

> 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
>    Affects Versions: 0.8.2.0
>            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
>   }



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