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From Ian Boston <...@tfd.co.uk>
Subject Re: PM concurrency issues
Date Mon, 05 Oct 2009 11:27:38 GMT

On 5 Oct 2009, at 10:47, Andrey Adamovich wrote:

> Hi guys!
> I have recently created an issue about concurrency problems with  
> Oracle PM: https://issues.apache.org/jira/browse/JCR-2345
> But this seems to be a long running issue with JR as in this issue (https://issues.apache.org/jira/browse/JCR-314

> ) Jukka says:
> "Note that without solving the concurrency issues in persistence
> managers (both db and bundle) we're still stuck with fully serialized
> backend access. But this is one step in the correct direction; the
> second step would be to start removing the synchronization on the
> persistence managers."

I would be interested to know if this is still a problem with the DB  
based PM's in general ?
Are there any other PM's out there suitable for production work that  
dont have a DB as a bottleneck, because AFAICT, each PM has 1 DB  
connection serializing the writes to the DB?
A more sophisticated DB PM might have worker threads to increase  
throughput ?

Lots of questions, no answers (sorry)


> We are using JR 1.5.5 and I haven't noticed any big changes in JR's  
> SVN till version 1.6.0. So this is still an issue?
> Am I right? Or is there a possible solution to that? Anything I can  
> do about this? Will removing syncronisation blocks from Oracle PM be  
> very dangerous step?
> Best regards,
> Andrey

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