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https://issues.apache.org/jira/browse/KAFKA-6843?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Glasser updated KAFKA-6843:
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Summary: Document issue with Zookeeper DNS name resolutions changing (was:
Document issue with DNS TTL)
> Document issue with Zookeeper DNS name resolutions changing
> -----------------------------------------------------------
>
> Key: KAFKA-6843
> URL: https://issues.apache.org/jira/browse/KAFKA-6843
> Project: Kafka
> Issue Type: Bug
> Reporter: David Glasser
> Priority: Major
>
> We run Kafka and Zookeeper in Google Kubernetes Engine. We have recently had
> problems where our brokers had serious problems when GKE replaced our cluster
> (cycling both Zookeeper and Kafka in parallel). Kafka (1.0) brokers lost the
> ability the talk to Zookeeper, and eventually failed their controlled
> shutdown, leading to slow startup times for the new broker and outages for
> our system.
> We eventually tracked this down to the fact that (at least in our
> environment) the default JVM DNS caching behavior is to cache results
> forever. We rely on DNS to connect to Zookeeper, and the DNS resolution
> changes when the Zookeeper pods are replaced.
> The fix is straightforward: setting the property networkaddress.cache.ttl or
> sun.net.inetaddr.ttl to make the caching non-infinite (or use a "security
> manager"). See
> [https://docs.oracle.com/javase/8/docs/technotes/guides/net/properties.html]
> for details.
> I think this gotcha should be documented. Probably at
> [https://kafka.apache.org/11/documentation/#java] ? I'm happy to submit a PR
> if people agree this is the right place. (I suppose somehow fixing this in
> code would be nice too.)
> By the way, if you search the Apache issue tracker for
> [networkaddress.cache.ttl|https://issues.apache.org/jira/browse/JAMES-774?jql=text%20~%20%22%5C%22networkaddress.cache.ttl%5C%22%22],
> you'll learn that this is a common issue faced by many Apache Java projects.
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