[jira] [Commented] (KAFKA-196) Topic creation fails on large values

["Taylor Gautier (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13145519#comment-13145519 ] 

Taylor Gautier commented on KAFKA-196:
--------------------------------------

There are a lot of things that do this. In particular lots of different characters can cause problems but especially filesystem ones like '/' and ' ' etc.
                
> 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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