Grokbase Groups Hive user May 2011
FAQ
This is great info. Thanks a lot for sharing :)




________________________________
From: Paul Ingles <paul@oobaloo.co.uk>
To: user@hive.apache.org
Sent: Wed, May 4, 2011 4:48:20 AM
Subject: Re: HIVE Server multiple instances


For future reference I've posted a little more about our setup
here: http://oobaloo.co.uk/multiple-connections-with-hive


On Tue, May 3, 2011 at 8:01 PM, Paul Ingles wrote:

Nothing specifically about our Hive setup although some of us at Forward have
blogged bits and pieces about Hive + Hadoop and have a few Hadoop/Hive related
libs on our GitHub account: https://github.com/forward.
I've blogged a few bits (http://www.oobaloo.co.uk/) as has one of my colleagues
(http://blog.fingertap.org/post/1255463384/hive-thrift-client).

Another colleague also presented a little about our setup during a Hadoop meetup
last summer (http://skillsmatter.com/podcast/home/hadoop-in-context-1591). The
numbers Andy mentioned will be a little out of date but it does include some
screenshots of a few of the surrounding apps we built that connect to Hive and
Hadoop (including a web based Hive query tool + work queue).

I had a quick search through the mailing lists when we had connection problems
but I think most of it was discussed/resolved during a chat I had with Shevek
from Karmasphere at a London pub following a Hadoop meetup :)

If you're interested, I've posted a gist (https://gist.github.com/953926) that
contains our HAProxy config; clients connect to 10000 and are balanced between
:10001 and :10005 on 2 servers (so actually 10 backend servers).

Be happy to talk more about our experience- feel free to ping me an email off
list if you'd like.


On 3 May 2011, at 19:18, Matthew Rathbone wrote:

Hey Paul,

I'd be very interested in reading about your hadoop/hive setup, do you have a
blog post or anything describing this setup, or some of the issues you've have
with hive?

--
Matthew Rathbone
Foursquare | Software Engineer | Server Engineering Team
matthew@foursquare.com | @rathboma | 4sq

On Tuesday, May 3, 2011 at 2:15 PM, Paul Ingles wrote:
HiveServer does seem to support multiple connections but I think it still has
thread-safety problems (https://issues.apache.org/jira/browse/HIVE-80).
We've (www.forward.co.uk) certainly had instability problems with the thrift
server in the past and now run 5 or so instances behind the HAProxy
load-balancer (http://haproxy.1wt.eu/). Since we did that it's been
significantly better.

I think the JDBC server still operates using thrift to connect to the
HiveServer so I would expect it to have similar problems (but I may have got
that wrong :)

On 3 May 2011, at 18:59, Matthew Rathbone wrote:

Even if it is single threaded it certainly seems to support multiple
connections.

We run 5 workers all connected at the same time executing a different query
each ( with a different connection per worker).

Hope that helps

Matthew
On Tuesday, May 3, 2011 at 1:40 PM, V.Senthil Kumar wrote:
Thanks Matthew. The wiki page http://wiki.apache.org/hadoop/Hive/HiveServer
says
its single threaded. I have a queue of queries which gets added dynamically all
the time. By the time I run 1 query using 1 JDBC connection, the queue
gets
added more queries and builds up a backlog. So, I was that's why I was
wondering
whether I can run two or more instances to avoid having a big backlog in queue.


----- Original Message ----
From: Matthew Rathbone <matthew@foursquare.com>
To: user@hive.apache.org
Sent: Tue, May 3, 2011 7:46:49 AM
Subject: Re: HIVE Server multiple instances

Why would you want to run two? I think it is multithreaded, so you can query it
from two different connections

--
Matthew Rathbone
Foursquare | Software Engineer | Server Engineering Team
matthew@foursquare.com | @rathboma | 4sq

On Monday, May 2, 2011 at 6:41 PM, V.Senthil Kumar wrote:
Hello,
I have one instance of HIVE JDBC server running on port 10000. Can I run
another

instance on different port ? Would it cause a concurrency issue on the
underlying data warehouse files ? Please clarify.

Thanks,
V.Senthil Kumar

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