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Posted to users@jackrabbit.apache.org by Sriram Narayanan <sr...@gmail.com> on 2007/02/01 14:35:30 UTC
Multiple Jackrabbits using the same database for read operations
Hi all:
Assume a Content Repository store that we will only read from. In such
a case, would it be possible for multiple instances of JackRabbit to
hit the same database ?
Are there any lessons learned when trying such an action ?
If this is not available out of the box, would implementing a custom
PersistenceManager help ? I'm willing to put in this effort, if need
be.
Thanks in advance
-- Sriram
Re: Multiple Jackrabbits using the same database for read operations
Posted by Stefan Guggisberg <st...@gmail.com>.
On 2/1/07, Sriram Narayanan <sr...@gmail.com> wrote:
> Hi all:
>
> Assume a Content Repository store that we will only read from. In such
> a case, would it be possible for multiple instances of JackRabbit to
> hit the same database ?
i've never tried it but i guess it should work as long as there are
strictly no write
operations on the repository.
>
> Are there any lessons learned when trying such an action ?
it won't be possible to share the repository home directory among
the jackrabbit instances since the repositry .lock file would prevent this.
you therefore have to make sure that every instance uses an identical copy
of the repository home directory. this might be inefficient because of
redundant lucene indexes etc.
cheers
stefan
>
> If this is not available out of the box, would implementing a custom
> PersistenceManager help ? I'm willing to put in this effort, if need
> be.
>
> Thanks in advance
>
> -- Sriram
>
RE: Multiple Jackrabbits using the same database for read operations
Posted by Shaun Barriball <sb...@yahoo.co.uk>.
Hi Anton,
We did some initial tests using RMI and performance was much too slow
compared with a Model 1 or 2 deployment.
Regards,
Shaun.
-----Original Message-----
From: anton_slutsky [mailto:aslutsky@applevac.com]
Sent: 06 February 2007 00:00
To: users@jackrabbit.apache.org
Subject: RE: Multiple Jackrabbits using the same database for read
operations
Hello everyone,
This is an intersting topic. We are thinking of how to handle the same
exact use case and pointing various jackrabbit instances to the same
datasource is being heavily discussed. Looking at how they do their
indexing and such, it doesnt look like it would work. Has anybody tried
using the JCA or the RMI access options on applications with any
considerable load? I'm wondering if those methods are scalable enough.
Thanks
Shaun Barriball wrote:
>
> Hi Sriram,
> I submitted a similar enquiry a few weeks ago titled "Deployment
> use-case
> :
> 1 read/write instance / multiple read-only instances" and my
> understanding is that you cannot read from the same database (much as we'd
like to).
> The recommended solution is to use the JackRabbit clustering features
> and database replication to distinct db instances for each reader. I'm
> assuming that multiple repositories hitting the same database can
> cause corruption.
>
> I'd welcome any suggestions from those that know different to the above.
>
> Regards,
> Shaun.
>
> -----Original Message-----
> From: Sriram Narayanan [mailto:sriramnrn@gmail.com]
> Sent: 01 February 2007 13:36
> To: users@jackrabbit.apache.org
> Subject: Multiple Jackrabbits using the same database for read
> operations
>
> Hi all:
>
> Assume a Content Repository store that we will only read from. In such
> a case, would it be possible for multiple instances of JackRabbit to
> hit the same database ?
>
> Are there any lessons learned when trying such an action ?
>
> If this is not available out of the box, would implementing a custom
> PersistenceManager help ? I'm willing to put in this effort, if need be.
>
> Thanks in advance
>
> -- Sriram
>
>
>
> ___________________________________________________________
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>
>
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operations-tf3154867.html#a8817873
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RE: Multiple Jackrabbits using the same database for read
operations
Posted by anton_slutsky <as...@applevac.com>.
Hello everyone,
This is an intersting topic. We are thinking of how to handle the same
exact use case and pointing various jackrabbit instances to the same
datasource is being heavily discussed. Looking at how they do their
indexing and such, it doesnt look like it would work. Has anybody tried
using the JCA or the RMI access options on applications with any
considerable load? I'm wondering if those methods are scalable enough.
Thanks
Shaun Barriball wrote:
>
> Hi Sriram,
> I submitted a similar enquiry a few weeks ago titled "Deployment use-case
> :
> 1 read/write instance / multiple read-only instances" and my understanding
> is that you cannot read from the same database (much as we'd like to).
> The recommended solution is to use the JackRabbit clustering features and
> database replication to distinct db instances for each reader. I'm
> assuming
> that multiple repositories hitting the same database can cause corruption.
>
> I'd welcome any suggestions from those that know different to the above.
>
> Regards,
> Shaun.
>
> -----Original Message-----
> From: Sriram Narayanan [mailto:sriramnrn@gmail.com]
> Sent: 01 February 2007 13:36
> To: users@jackrabbit.apache.org
> Subject: Multiple Jackrabbits using the same database for read operations
>
> Hi all:
>
> Assume a Content Repository store that we will only read from. In such a
> case, would it be possible for multiple instances of JackRabbit to hit the
> same database ?
>
> Are there any lessons learned when trying such an action ?
>
> If this is not available out of the box, would implementing a custom
> PersistenceManager help ? I'm willing to put in this effort, if need be.
>
> Thanks in advance
>
> -- Sriram
>
>
>
> ___________________________________________________________
> Inbox full of spam? Get leading spam protection and 1GB storage with All
> New Yahoo! Mail. http://uk.docs.yahoo.com/nowyoucan.html
>
>
--
View this message in context: http://www.nabble.com/Multiple-Jackrabbits-using-the-same-database-for-read-operations-tf3154867.html#a8817873
Sent from the Jackrabbit - Users mailing list archive at Nabble.com.
RE: Multiple Jackrabbits using the same database for read operations
Posted by Shaun Barriball <sb...@yahoo.co.uk>.
Hi Sriram,
I submitted a similar enquiry a few weeks ago titled "Deployment use-case :
1 read/write instance / multiple read-only instances" and my understanding
is that you cannot read from the same database (much as we'd like to).
The recommended solution is to use the JackRabbit clustering features and
database replication to distinct db instances for each reader. I'm assuming
that multiple repositories hitting the same database can cause corruption.
I'd welcome any suggestions from those that know different to the above.
Regards,
Shaun.
-----Original Message-----
From: Sriram Narayanan [mailto:sriramnrn@gmail.com]
Sent: 01 February 2007 13:36
To: users@jackrabbit.apache.org
Subject: Multiple Jackrabbits using the same database for read operations
Hi all:
Assume a Content Repository store that we will only read from. In such a
case, would it be possible for multiple instances of JackRabbit to hit the
same database ?
Are there any lessons learned when trying such an action ?
If this is not available out of the box, would implementing a custom
PersistenceManager help ? I'm willing to put in this effort, if need be.
Thanks in advance
-- Sriram
___________________________________________________________
Inbox full of spam? Get leading spam protection and 1GB storage with All New Yahoo! Mail. http://uk.docs.yahoo.com/nowyoucan.html