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From "Jacques Nadeau (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4433) Unnecessary entries created in ZK when a jdbc application uses a wrong connection URL
Date Wed, 24 Feb 2016 19:00:20 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15163528#comment-15163528
] 

Jacques Nadeau commented on DRILL-4433:
---------------------------------------

I would add an additional note here, as well:

ZK is only used by the client to determine what nodes are available, not maintain cluster
cohesion. As such, it should be fast and not a long-lasting connection. I think that as part
of this change we should also use a faster mechanism to doing this lookup.

> Unnecessary entries created in ZK when a jdbc application uses a wrong connection URL

> --------------------------------------------------------------------------------------
>
>                 Key: DRILL-4433
>                 URL: https://issues.apache.org/jira/browse/DRILL-4433
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Client - JDBC
>            Reporter: Rahul Challapalli
>
> commit # : 6d5f4983003b8f5d351adcb0bc9881d2dc4c2d3f
> commit date : Feb 22, 2016
> In my JDBC application, I accidentally used an invalid connection string like below
> {code}
> jdbc:drill:zk=x.x.x.x:5181/zkroot-blah/cluster-name
> {code}
> While drill correctly reported an "No DrillbitEndpoint can be found error", I also observed
that it created an entry in zookeeper by the name "zkroot-blah". There seems to be no reason
for doing this.



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