number of Solr indexes per Tomcat instance

[Erik_l <er...@lindgrens.co.uk>]

Hi,

Currently we're running 10 Solr indexes inside a single Tomcat6 instance. In
the near future we would like to add another 30-40 indexes to every Tomcat
instance we host. What are the factors we have to take into account when
planning for such deployments? Obviously we do know the sizes of the indexes
but for example how much memory does Solr need to be allocated given that
each index is treated as a webapp in Tomcat. Also, do you know if Tomcat has
got a limit in number of apps that can be deployed (maybe I should ask this
questions in a Tomcat forum). 

Thanks
E
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Re: number of Solr indexes per Tomcat instance

[Erik_l <er...@lindgrens.co.uk>]

That's a really good point. I didn't think about the GCs. Obviously we don't
want to have all the indexes hanging if full GC occur. Wee running a +8GB
heap so GCs are very important to us.

Thanks
Erik


wojtekpia wrote:
> 
> I ran into trouble running several cores (either as Solr multi-core or as
> separate web apps) in a single JVM because the Java garbage collector
> would freeze all cores during a collection. This may not be an issue if
> you're not dealing with large amounts of memory. My solution is to run
> each web app in its own JVM and Tomcat instance.
> 
> 

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Re: number of Solr indexes per Tomcat instance

[wojtekpia <wo...@hotmail.com>]

I ran into trouble running several cores (either as Solr multi-core or as
separate web apps) in a single JVM because the Java garbage collector would
freeze all cores during a collection. This may not be an issue if you're not
dealing with large amounts of memory. My solution is to run each web app in
its own JVM and Tomcat instance.

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Re: number of Solr indexes per Tomcat instance

[Marc Sturlese <ma...@gmail.com>]

Probably multicore would give you better performance... I think most
important factors to take into account are the size of the index and the
traffic you have to hold. With enought RAM memory you can hold 40 cores in a
singe solr instance (or even more) but depending on the traffic you have to
hold you will suffer of slow response times.

Erik_l wrote:
> 
> We're not using multicore. Today, one Tomcat instance host a number of
> indexes in form of 10 Solr indexes (10 individual war files).
> 
> 
> Marc Sturlese wrote:
>> 
>> Are you using one single solr instance with multicore or multiple solr
>> instances with one index each?
>> 
>> Erik_l wrote:
>>> 
>>> Hi,
>>> 
>>> Currently we're running 10 Solr indexes inside a single Tomcat6
>>> instance. In the near future we would like to add another 30-40 indexes
>>> to every Tomcat instance we host. What are the factors we have to take
>>> into account when planning for such deployments? Obviously we do know
>>> the sizes of the indexes but for example how much memory does Solr need
>>> to be allocated given that each index is treated as a webapp in Tomcat.
>>> Also, do you know if Tomcat has got a limit in number of apps that can
>>> be deployed (maybe I should ask this questions in a Tomcat forum). 
>>> 
>>> Thanks
>>> E
>>> 
>> 
>> 
> 
> 

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Re: number of Solr indexes per Tomcat instance

[Erik_l <er...@lindgrens.co.uk>]

We're not using multicore. Today, one Tomcat instance host a number of
indexes in form of 10 Solr indexes (10 individual war files).


Marc Sturlese wrote:
> 
> Are you using one single solr instance with multicore or multiple solr
> instances with one index each?
> 
> Erik_l wrote:
>> 
>> Hi,
>> 
>> Currently we're running 10 Solr indexes inside a single Tomcat6 instance.
>> In the near future we would like to add another 30-40 indexes to every
>> Tomcat instance we host. What are the factors we have to take into
>> account when planning for such deployments? Obviously we do know the
>> sizes of the indexes but for example how much memory does Solr need to be
>> allocated given that each index is treated as a webapp in Tomcat. Also,
>> do you know if Tomcat has got a limit in number of apps that can be
>> deployed (maybe I should ask this questions in a Tomcat forum). 
>> 
>> Thanks
>> E
>> 
> 
> 

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Re: number of Solr indexes per Tomcat instance

[Marc Sturlese <ma...@gmail.com>]

Are you using one single solr instance with multicore or multiple solr
instances with one index each?

Erik_l wrote:
> 
> Hi,
> 
> Currently we're running 10 Solr indexes inside a single Tomcat6 instance.
> In the near future we would like to add another 30-40 indexes to every
> Tomcat instance we host. What are the factors we have to take into account
> when planning for such deployments? Obviously we do know the sizes of the
> indexes but for example how much memory does Solr need to be allocated
> given that each index is treated as a webapp in Tomcat. Also, do you know
> if Tomcat has got a limit in number of apps that can be deployed (maybe I
> should ask this questions in a Tomcat forum). 
> 
> Thanks
> E
> 

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