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https://issues.apache.org/jira/browse/CURATOR-40?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Grove updated CURATOR-40:
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Description:
We use DNS names on Amazon EC2 to specify Zookeeper host names. If one of the
ZK hosts shuts down or loses network connectivity we can no longer connect via
Curator, even though the other ZK hosts are still running and have quorum. The
issue is specific to an UnknownHostException being thrown on DNS resolution
when calling the start() method on CuratorZookeeperClient. The workaround is
for us to use IP addresses rather than DNS names, but this isn't really
workable on EC2 since IP addresses change when servers restart so we use
Elastic IPs to ensure that the ZK hosts have fixed IP addresses.
I have attached a unit test which demonstrates the issue and provides more
detail in the comments.
was:
We use DNS names on Amazon EC2 to specify Zookeeper host names. If one of the
ZK hosts shuts down or loses network connectivity we can no longer connect via
Curator, even though the other ZK hosts are still running and have quorum. The
issue is specific to an UnknownHostException being thrown on DNS resolution
when calling the start() method on CuratorZookeeperClient. The workaround is
for us to use IP addresses rather than DNS names, but this isn't good practice
on EC2.
I have attached a unit test which demonstrates the issue and provides more
detail in the comments.
> Curator client does cannot connect after one zookeeper host shuts down on EC2
> -----------------------------------------------------------------------------
>
> Key: CURATOR-40
> URL: https://issues.apache.org/jira/browse/CURATOR-40
> Project: Apache Curator
> Issue Type: Bug
> Components: Client
> Affects Versions: 2.0.1-incubating
> Environment: Ubuntu instances on Amazon EC2 using DNS host names
> Reporter: Andy Grove
> Attachments: ApacheCuratorUnknownHostTest.java
>
>
> We use DNS names on Amazon EC2 to specify Zookeeper host names. If one of the
> ZK hosts shuts down or loses network connectivity we can no longer connect
> via Curator, even though the other ZK hosts are still running and have
> quorum. The issue is specific to an UnknownHostException being thrown on DNS
> resolution when calling the start() method on CuratorZookeeperClient. The
> workaround is for us to use IP addresses rather than DNS names, but this
> isn't really workable on EC2 since IP addresses change when servers restart
> so we use Elastic IPs to ensure that the ZK hosts have fixed IP addresses.
> I have attached a unit test which demonstrates the issue and provides more
> detail in the comments.
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