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https://issues.apache.org/jira/browse/CURATOR-439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16445867#comment-16445867
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Alex Rankin commented on CURATOR-439:
-------------------------------------
Updating the status to major. After a network outage we saw the Curator status
was STARTED, but the Zookeeper client was not connected. This resulted in an
outage and forced us to bounce the applications.
> CuratorFrameworkState STARTED, but ZookeeperClient not connected
> ----------------------------------------------------------------
>
> Key: CURATOR-439
> URL: https://issues.apache.org/jira/browse/CURATOR-439
> Project: Apache Curator
> Issue Type: Bug
> Components: Framework
> Affects Versions: 3.2.1
> Reporter: Alex Rankin
> Priority: Major
>
> I recently ran into an issue on some of our nodes caused by network issues
> between a service and Zookeeper. I have been unable to recreate them as of
> yet, but I'm still trying.
> *+Setup+*
> 5x services using Curator 3.2.1 to talk to Zookeeper 3.5.3 cluster (also 5
> nodes).
> Network issues caused the services to disconnect from Zookeeper.
> There's a check in our code to see if the Zookeeper connection is available
> before sending a request:
> {quote}public boolean isConnected() \{
> return curatorFramework.getZookeeperClient().isConnected();
> \}
> {quote}
> After the network issues resolved, we noticed that all calls to Zookeeper
> from 4 of the services were still failing (the fifth was fine). Checking the
> logs, we saw that {{CuratorFramework.getState()}} was reporting the state as
> STARTED, but {{curatorFramework.getZookeeperClient().isConnected();}} was
> returning false. Restarting the service fixed everything, but I want to
> obviously avoid this issue in future.
> *+Problem+*
> I couldn't find any documentation stating whether the
> {{CuratorZookeeperClient.isConnected()}} should be used, or if
> {{CuratorFramework.getState() == CuratorFrameworkState.STARTED}} (the
> functionality of the deprecated {{CuratorFramework.isConnected()}}) would be
> the better check, or if these should both be equivalent, and there's a bug
> that let one be true while the other was false.
> If my own check is wrong, and I shouldn't be using
> {{CuratorZookeeperClient.isConnected()}}, then I can easily fix that. I
> wanted to check the expected behaviour before diving too deep into this, in
> case this is normal and I am just using Curator incorrectly.
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