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https://issues.apache.org/jira/browse/ZOOKEEPER-2184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14601157#comment-14601157
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Guy Moshkowich commented on ZOOKEEPER-2184:
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[~bhavanki]:
Hi Bill,
I want to try and fix this defect and would like to ask you for a review on my
proposal.
*What is the issue?*
ZK client resolve the host name to ip's when it starts i.e., not when it tries
to reconnect to the ZK cluster.
When restarting ZooKeeper Dockers containers - the ip address of the ZooKeeper
server might change (at least this is my understanding), causing the client
fail reconnecting to the cluster.
*Proposed fix:*
Have _StaticHostProvider.next(int)_ resolve the host addresses of
serverAddresses at the start of the method.
This method is called from _SendThread.startConnect()_ and
_SendThread.pingRwServer()_ which are used for re-connections flow.
Any thoughts?
> Zookeeper Client should re-resolve hosts when connection attempts fail
> ----------------------------------------------------------------------
>
> Key: ZOOKEEPER-2184
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2184
> Project: ZooKeeper
> Issue Type: Bug
> Components: java client
> Affects Versions: 3.4.6, 3.5.0
> Environment: Ubuntu 14.04 host, Docker containers for Zookeeper &
> Kafka
> Reporter: Robert P. Thille
>
> Testing in a Docker environment with a single Kafka instance using a single
> Zookeeper instance. Restarting the Zookeeper container will cause it to
> receive a new IP address. Kafka will never be able to reconnect to Zookeeper
> and will hang indefinitely. Updating DNS or /etc/hosts with the new IP
> address will not help the client to reconnect as the
> zookeeper/client/StaticHostProvider resolves the connection string hosts at
> creation time and never re-resolves.
> A solution would be for the client to notice that connection attempts fail
> and attempt to re-resolve the hostnames in the connectString.
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