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From Kuba Lekstan <kueb...@gmail.com>
Subject Re: Client host selection?
Date Thu, 02 May 2013 12:13:28 GMT
At my company we are using some kind of a credential system. If client asks
the credential system for ZK nodes it returns the ZK nodes which are
located in same DC unless told otherwise.


2013/5/2 Owen Kim <ohechkay@gmail.com>

> So, what I've been doing is using haproxy to set the local nodes as
> primary. Though, this created a problem with Cassandra when I did the same
> because it obfuscated application errors and created failover problems that
> the client would normally handle because the client only saw a single host.
> The Cass client has a configurable load balancing policy. I was hoping ZK
> had the same so I could get rid of haproxy.
>
>
>
>
> On Wed, May 1, 2013 at 6:22 PM, Jordan Zimmerman <
> jordan@jordanzimmerman.com
> > wrote:
>
> > If you can determine local clients, just limit your connection string to
> > those local clients. Of course, this limits failover to local servers,
> but
> > would be a decent workaround until there's better support in ZK.
> >
> > -JZ
> >
> > On May 1, 2013, at 6:05 PM, Owen Kim <ohechkay@gmail.com> wrote:
> >
> > > Thanks for the info.
> > >
> > > That feature would be useful. I can determine local nodes myself and
> feed
> > > them into the client.
> > > https://issues.apache.org/jira/browse/ZOOKEEPER-1698
> > >
> > >
> > > On Wed, May 1, 2013 at 5:48 PM, Michi Mutsuzaki <michi@cs.stanford.edu
> > >wrote:
> > >
> > >> C client has zoo_deterministic_conn_order() to make the connection
> > >> order deterministic. We can add a similar feature to Java client.
> > >> Owen, do you want to open a JIRA for this?
> > >>
> > >> --Michi
> > >>
> > >> On Wed, May 1, 2013 at 5:40 PM, Benjamin Reed <breed@apache.org>
> wrote:
> > >>> no it will connect randomly. we don't really have a way to specify
> > >>> preference or weight. it would be a nice feature to add though.
> > >>>
> > >>> ben
> > >>>
> > >>>
> > >>> On Wed, May 1, 2013 at 5:26 PM, Owen Kim <ohechkay@gmail.com>
wrote:
> > >>>
> > >>>> Is the client configurable on which host it tries to connect to
> when I
> > >> give
> > >>>> it the host list? Will it perhaps try deterministically in order?
> > >>>> Specifically, I'd like it to favor ZK hosts in the same DC.
> > >>>>
> > >>
> >
> >
>

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