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From Nick Dimiduk <>
Subject Re: Phoenix Query Server Placement
Date Mon, 04 Jan 2016 17:03:20 GMT
Hi Andreas,

As Jesse mentions, PQS is a relatively light-weight process; it's just
proxying phoenix queries. It will contain a connection instance for each
client and a cache of recently prepared statements. Eventually we hope to
make query execution stateless, and allow clients to transparently hit a
group of PQS instances via load-balancing -- they're just HTTP requests
after all. At such time, I imagine we'll see folks running a PQS as just
another "worker" node, running on all of or a subset of hosts running
region server processes.

Good luck,

On Sat, Dec 5, 2015 at 8:22 AM, Jesse Yates <> wrote:

> I think he means its not a terribly expensive process - it is basically
> just a fancy query proxy. If you are running a cluster any larger than 3
> nodes you should seriously consider running at least a second or third
> HMaster. When they are in standby mode they don't do very much - just watch
> ZK for the leader lock. When active they very very rarely impact the path
> of the client and you should be able to pretty easily ride over a hmaster
> failover event.
> However, given that it is a pretty new component, I would personally be
> cautious putting it on nodes that affect the entire cluster health, like
> the servers hosting ZK or the NN.
> Just my $0.02
> On Sat, Dec 5, 2015 at 4:20 AM Andreas Fritzler <
>> wrote:
>> Thanks Thomas. Yes, that's the one.
>> What exactly do you mean by "heavy"? I was wondering if it would make
>> sense to put it on the same host as the HBase master. On the other side I
>> don't want the query server bring down the master machine ...
>> On Fri, Dec 4, 2015 at 4:56 PM, Thomas Decaux <> wrote:
>>> You mean
>>> I am not sure it's really heavy, so I would suggest to run it closest
>>> from HBase server.
>>> 2015-12-04 15:59 GMT+01:00 Andreas Fritzler <>
>>> :
>>>> Hi,
>>>> What is the best place to install the Phoenix Query Server within an
>>>> HDP Hadoop cluster? Is it a good idea to place it on one of the master
>>>> machines? Or would your rather suggest to have a dedicated host for that?
>>>> Also any suggestion/best practices on how to load balance multiple
>>>> instances of the query server?
>>>> Thanks a lot in advance!
>>>> Regards,
>>>> Andreas

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