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Zookeeper >> mail # user >> Client host selection?


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Owen Kim 2013-05-02, 00:26
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Benjamin Reed 2013-05-02, 00:40
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Michi Mutsuzaki 2013-05-02, 00:48
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Owen Kim 2013-05-02, 01:05
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Jordan Zimmerman 2013-05-02, 01:22
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Re: Client host selection?
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 <[EMAIL PROTECTED]
> 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 <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]
> >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 <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> 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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Kuba Lekstan 2013-05-02, 12:13