hy this is happening. I have the following
resource in my webapp's context.xml file. Is there anything else I
need to do enable connection pooling with a JNDI resource?
Thanks in advance.
-Salil
ntext.xml file. Is there anything else I
> need to do enable connection pooling with a JNDI resource?
>
> type="javax.sql.DataSource" username="root" password=""
> driverClassName="com.mysql.jdbc.Driver"
>
> url="jdbc:mysql://localhos
;>
>> WARNING: You are not using ConnectionPoolDataSource. Make sure your
>> DataSource pools connections to the database itself, or database
>> performance will be severely reduced.
>>
>> I'm not really sure why this is happening. I have the following
>>
nnectionPoolDataSource. Make sure your
>>> DataSource pools connections to the database itself, or database
>>> performance will be severely reduced.
>>>
>>> I'm not really sure why this is happening. I have the following
>>> resource in my webapp'
;>> DataSource pools connections to the database itself, or database
>>>> performance will be severely reduced.
>>>>
>>>> I'm not really sure why this is happening. I have the following
>>>> resource in my webapp's context
AM, Salil Apte wrote:
>>>>
>>>>> So I keep getting this warning from either Mahout or the server (I'm
>>>>> guessing the former):
>>>>>
>>>>> WARNING: You are not using ConnectionPoolDataSource. Make sure your
>>>
On 13.07.2011 08:12, Salil Apte wrote:
Is an item based approached preferable when considering speed?
Itembased approaches are said to scale better as there exist less items
than users in most usecases and item-item-similarities can be precomputed.
But before you change your setup we should
tting this warning from either Mahout or the server (I'm
> >>> guessing the former):
> >>>
> >>> WARNING: You are not using ConnectionPoolDataSource. Make sure your
> >>> DataSource pools connections to the database itself, or database
> >>>
gt;>> So I keep getting this warning from either Mahout or the server (I'm
> > >>> guessing the former):
> > >>>
> > >>> WARNING: You are not using ConnectionPoolDataSource. Make sure your
> > >>> DataSource pools connections to
That's all correct, it reads a lot. But you can avoid a lot of it by using
caching wrappers.
You also don't need to dump to a file. Use ReloadFromJDBCDataModel.
On Wed, Jul 13, 2011 at 9:57 AM, Vitali Mogilevsky
wrote:
> Hey,
> I got the same problem, of slowness while using MYSQL data model, aft
Thanks, will test that
On Wed, Jul 13, 2011 at 12:11 PM, Sean Owen wrote:
> That's all correct, it reads a lot. But you can avoid a lot of it by using
> caching wrappers.
> You also don't need to dump to a file. Use ReloadFromJDBCDataModel.
>
> On Wed, Jul 13, 2011 at 9:57 AM, Vitali Mogilevsky
Awesome, I will give ReloadFromJDBCDataModel a try. How does this
particular data model update itself on database changes? Does it just
happen periodically and if so, can this rate be change easily?
Lastly, will calling clear(userId) on a recommender frequently be bad
for performance? I'm assuming
-Original Message-
From: Salil Apte
Date: Wed, 13 Jul 2011 10:19:47
To:
Reply-To: user@mahout.apache.org
Subject: Re: Connection Pooling
Awesome, I will give ReloadFromJDBCDataModel a try. How does this
particular data model update itself on database changes? Does it just
happen
Yes it reloads after a configurable interval, or on demand.
Clearing the cache for a user ID only means that user's data is recomputed.
It's not bad to call this frequently per se... I suppose you want to let it
cache as much and for as long as is valid and acceptable to your app.
Your bottleneck
Where can the interval be configured? BTW, ReloadFromJDBCDataModel
works like a dream so far :)
On Wed, Jul 13, 2011 at 10:58 AM, Sean Owen wrote:
> Yes it reloads after a configurable interval, or on demand.
>
> Clearing the cache for a user ID only means that user's data is recomputed.
> It's n
I was mixing this up with another class. It doesn't reload itself. You can
call refresh() to do so.
On Wed, Jul 13, 2011 at 7:34 PM, Salil Apte wrote:
> Where can the interval be configured? BTW, ReloadFromJDBCDataModel
> works like a dream so far :)
>
> On Wed, Jul 13, 2011 at 10:58 AM, Sean Ow
Actually, as GenericDataModel class works very well as a super class of your
desired data model. This way everything is cached into memory and boosts
performance a lot. The reloading is actually easy to be implemented with the
refresh mechanism (Taste objects implement Refreshable interface). You c
Hello,
I am considering to implement a recommendation engine for a small size
website. The website will employ LAMP stack, and for some reasons the
recommendation engine must be written in C++. It consists of an On-line
Component and Off-line Component, both need to connect to MySQL. The
differenc
Not sure, is this really related to Mahout?
I don't know of an equivalent of J2EE / Tomcat for C++, but there must
be something.
As a general principle, you will have to load your data into memory if
you want to perform the computations on the fly in real time. So how
you access the data isn't so
Hi Mike,
the following paper contains some comparisons between different database stacks.
I can also give you the QtSQL code if you are interested in it.
http://www.manuel-blechschmidt.de/data/MMRPG2.pdf
/Manuel
Am 05.06.2013 um 13:44 schrieb Mike W.:
> Hello,
>
> I am considering to implemen
Hello,
I am new to Mahout. I am using it to get recommendations out of my data stored
in a MySQL database. I have started by configuring the DataSource
programmatically, and followed the performace hints in the JavaDoc for
MySQLJDBCDataModel. But without connection pooling the performance is
vaDoc for
> MySQLJDBCDataModel. But without connection pooling the performance is with
> just 3000 preferences extremely bad.
I think we exchanged a message before -- the issue was perhaps you
were not using connection pools or indexes?
> I am using Tomcat and I have done the configuration as descr
Thank you for your answer! I am using indexes as you suggest in your book, but
I have problems with the configuration for connection pooling.
I have used the following code:
DataSource dataSource=null;
try {
dataSource = (DataSource)ctx.lookup("java:/comp/env/jdbc/MySQLDB");
This really isn't a question about Mahout itself, but I believe I can
still help.
I don't see anywhere that you've actually configured the DataSource!
You need something like this in server.xml; this is my standard
"recipe":
nable.run(ThreadPool.java:689)
java.lang.Thread.run(Unknown Source)
That is really strange to me, since I can see the JNDI Name in the admin
webapplication. I am already quite frustrated :(
--- Sean Owen schrieb am Di, 9.11.2010:
> Von: Sean Owen
> Betreff: Re: Usage of MySQ
I take it back -- I think the way you are configuring it is also valid.
However the problem is that for whatever reason it is not configuring
and deploying JNDI correctly. You should look in the server logs for a
clue to the problem.
On Tue, Nov 9, 2010 at 11:03 AM, Sean Owen wrote:
> This really
It is not being configured -- class and URL are null. You might try my
style of configuring it as I know it works.
On Tue, Nov 9, 2010 at 2:46 PM, Karl Eigengrund
wrote:
> Thank you for your help!!
> I have tried it as you suggested and also on a different system (Ubuntu
> instead of Windows), b
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