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From "Manikumar (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (KAFKA-196) Topic creation fails on large values
Date Thu, 17 Aug 2017 11:39:00 GMT

     [ https://issues.apache.org/jira/browse/KAFKA-196?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Manikumar resolved KAFKA-196.
-----------------------------
    Resolution: Fixed

Topic MAX_NAME_LENGTH is set to 249 is newer Kafka verions.

> Topic creation fails on large values
> ------------------------------------
>
>                 Key: KAFKA-196
>                 URL: https://issues.apache.org/jira/browse/KAFKA-196
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>            Reporter: Pierre-Yves Ritschard
>         Attachments: 0001-Set-a-hard-limit-on-topic-width-this-fixes-KAFKA-196.patch
>
>
> Since topic logs are stored in a directory holding the topic's name, creation of the
directory might fail for large strings.
> This is not a problem per-se but the exception thrown is rather cryptic and hard to figure
out for operations.
> I propose fixing this temporarily with a hard limit of 200 chars for topic names, it
would also be possible to hash the topic name.
> Another concern is that the exception raised stops the broker, effectively creating 
a simple DoS vector, I'm concerned about how tests or wrong client library usage can take
down the whole broker.



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