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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2184) Zookeeper Client should re-resolve hosts when connection attempts fail
Date Fri, 17 Mar 2017 08:06:43 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15929563#comment-15929563
] 

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

GitHub user geek101 opened a pull request:

    https://github.com/apache/zookeeper/pull/199

    ZOOKEEPER-2184: Resolve address only on demand.

    Wrap hostname and port into a new ServerCfg class and fix
    all the places to use it instead of InetSocketAddress.
    
    This class can be used in the future to encapsulate other
    nice config information for example certificate
    fingerprint associated with the host etc.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/geek101/zookeeper branch-3.5-hostname-resolve-always

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/zookeeper/pull/199.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #199
    
----
commit ec219a4f40fe46a9743ad13ff910f9be9f383f3c
Author: Powell Molleti <powellm79@yahoo.com>
Date:   2017-03-17T07:59:23Z

    Resolve address only on demand.
    
    Wrap hostname and port into a new ServerCfg class and fix
    all the places to use it instead of InetSocketAddress.
    
    This class can be used in the future to encapsulate other
    nice config information for example certificate
    fingerprint associated with the host etc.

----


> 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
>            Assignee: Flavio Junqueira
>              Labels: easyfix, patch
>             Fix For: 3.5.4, 3.6.0, 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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