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Date: Thu, 5 Oct 2017 19:22:01 +0000 (UTC)
From: "ASF GitHub Bot (JIRA)" <jira@apache.org>
To: dev@zookeeper.apache.org
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Subject: [jira] [Commented] (ZOOKEEPER-2184) Zookeeper Client should
 re-resolve hosts when connection attempts fail
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archived-at: Thu, 05 Oct 2017 19:22:07 -0000


    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16193491#comment-16193491 ] 

ASF GitHub Bot commented on ZOOKEEPER-2184:
-------------------------------------------

Github user edvorkin commented on the issue:

    https://github.com/apache/zookeeper/pull/150
  
    +1 one here. This feature is necessary for running Zookeeper in the cloud under AWS ASG. Every time node fails, ASG reassigns new IP for new zookeeper and there is no way kafka will know about it. We need to treat zookeeper servers as cattle, not pets, and kill and spin new one at will without affecting kafka. 


> 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, 3.4.7, 3.4.8, 3.4.9, 3.4.10, 3.5.0, 3.5.1, 3.5.2, 3.5.3
>         Environment: Ubuntu 14.04 host, Docker containers for Zookeeper & Kafka
>            Reporter: Robert P. Thille
>            Assignee: Flavio Junqueira
>            Priority: Blocker
>              Labels: easyfix, patch
>             Fix For: 3.5.4, 3.4.11
>
>         Attachments: ZOOKEEPER-2184.patch
>
>
> 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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