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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-3170) Default value of fetch_min_bytes in new consumer is 1024 while doc says it is 1
Date Fri, 29 Jan 2016 13:58:39 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-3170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15123499#comment-15123499
] 

ASF GitHub Bot commented on KAFKA-3170:
---------------------------------------

GitHub user rajinisivaram opened a pull request:

    https://github.com/apache/kafka/pull/832

    KAFKA-3170: Set default fetch_min_bytes in new consumer to 1

    Set default to 1 instead of 1024, this matches the existing doc and feels like a better
default value. Have run the unit tests with the change.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/rajinisivaram/kafka KAFKA-3170

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/kafka/pull/832.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #832
    
----
commit 7e9f944a61e331738ff7c9ed7ee93495039d697f
Author: Rajini Sivaram <rajinisivaram@googlemail.com>
Date:   2016-01-29T13:47:08Z

    KAFKA-3170: Set default fetch_min_bytes in new consumer to 1

----


> Default value of fetch_min_bytes in new consumer is 1024 while doc says it is 1
> -------------------------------------------------------------------------------
>
>                 Key: KAFKA-3170
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3170
>             Project: Kafka
>          Issue Type: Bug
>          Components: consumer
>    Affects Versions: 0.9.0.0
>            Reporter: Rajini Sivaram
>            Assignee: Rajini Sivaram
>
> FETCH_MIN_BYTES_DOC says:
> {quote}
> The minimum amount of data the server should return for a fetch request. If insufficient
data is available the request will wait for that much data to accumulate before answering
the request. The default setting of 1 byte means that fetch requests are answered as soon
as a single byte of data is available or the fetch request times out waiting for data to arrive.
Setting this to something greater than 1 will cause the server to wait for larger amounts
of data to accumulate which can improve server throughput a bit at the cost of some additional
latency.
> {quote}
> But the default value is actually set to 1024. Either the doc or the value needs to be
changed. Perhaps 1 is a better default?



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