[jira] [Commented] (KAFKA-10713) Surprising behaviour when bootstrap servers are separated by semicolons

["lqjacklee (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-10713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17231322#comment-17231322 ] 

lqjacklee commented on KAFKA-10713:
-----------------------------------

the bootstrap.servers should configured with Split data with semicolons (kafka-1:9092,kafka-1:9092,kafka-2:9092). 


Utils.getHost() is aim to parse the single address from the string which combined with different protocel.

> Surprising behaviour when bootstrap servers are separated by semicolons
> -----------------------------------------------------------------------
>
>                 Key: KAFKA-10713
>                 URL: https://issues.apache.org/jira/browse/KAFKA-10713
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: Mickael Maison
>            Assignee: Tom Bentley
>            Priority: Major
>
> When creating a Kafka client with {{bootstrap.servers}} set to "kafka-0:9092;kafka-1:9092;kafka-2:9092", it has a strange behaviour.
> For once, there's no warning or error messages. The client will connect and start working. However, it will only use the hostname after the last semicolon as bootstrap server!
> The configuration {{bootstrap.servers}} is defined as a {{List}} in {{AbstractConfig}}. So from a configuration point of view, "kafka-0:9092;kafka-1:9092;kafka-2:9092" is a single entry.
> Then, {{Utils.getHost()}} returns "kafka-2" when parsing that string.
> {code:java}
> assertEquals("kafka-2", getHost("kafka-1:9092;kafka-1:9092;kafka-2:9092"));
> {code}
> So the client ends up with a single bootstrap server! 
> I believe semicolon are not valid characters in hostname/domain names, so we should be able to provide better validation.



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