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https://issues.apache.org/jira/browse/KAFKA-495?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Swapnil Ghike updated KAFKA-495:
--------------------------------

    Attachment: kafka-495-v1.patch

Created two server config properties - 

1. Black list of characters that are not allowed in the topic names. Currently 
it excludes alphanumeric characters, _, -, (, ), [, ], { and }. Whitespaces are 
blacklisted.

2. Maximum length of a topic name.
                
> Handle topic names with "/" on Kafka server
> -------------------------------------------
>
>                 Key: KAFKA-495
>                 URL: https://issues.apache.org/jira/browse/KAFKA-495
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 0.7, 0.8
>            Reporter: Neha Narkhede
>            Assignee: Swapnil Ghike
>              Labels: bugs
>             Fix For: 0.8, 0.7.1
>
>         Attachments: kafka-495-v1.patch
>
>
> If a producer publishes data to topic "foo/foo", the Kafka server ends up 
> creating an invalid directory structure on the server. This corrupts the 
> zookeeper data structure for the topic - /brokers/topics/foo/foo. This leads 
> to rebalancing failures on the consumer as well as errors on the zookeeper 
> based producer. 
> We need to harden the invalid topic handling on the Kafka server side to 
> avoid this.

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