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From Aditya <adityakish...@gmail.com>
Subject Re: Test Case for Inability to run a Distributed Drill Query (on JSON files on FS).
Date Fri, 07 Nov 2014 21:29:24 GMT
I do not think Drillbits, in any mode, starts an embedded Zookeeper server.

I know because I was once looking for how to do it but could not find.

On Fri, Nov 7, 2014 at 1:18 PM, Ted Dunning <ted.dunning@gmail.com> wrote:

> On Fri, Nov 7, 2014 at 11:06 AM, Jacques Nadeau <jacques@apache.org>
> wrote:
> > Ted,
> > I'm not sure what you're suggesting.  Drill uses zk to find out about
> other
> > nodes.  As such, the only nodes it will know about are the nodes that
> have
> > the same zk setup.
> >
> If a ZK client has a connection string that contains members of multiple ZK
> clusters, then the client connect to different ZK nodes each time it
> connects.  This can lead to massive confusion.  If a Drillbit uses multiple
> connections, those connections could actually connect to different ZK
> nodes.  Thus, the drill bit might register with one ZK on one connection,
> but use another to find other drill bits.  The Curator library tends to use
> a style in which connections are used for fairly local purposes, so this
> isn't all that far-fetched.
> Similarly, if each drill bit actually is running a solo embedded ZK, a user
> could be confused about what is happening.  If somebody touched multiple
> drill bits and checked the ZK configs on each node, the problem would be
> obvious.

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