[birt-dev] RE: [birt-pmc] parallel data retrieval

["Wenfeng Li" <wli@xxxxxxxxxxx>]

Eric

Birt-dev@xxxxxxxxxxx is for this type of design and implementation
discussion.

One reason we are not able to do parallel data fetching is that BIRT
supports scripting.  Developer can write script such that the visibility
of the report item that uses  the 2nd data set depends on the value in
the first data set.  Developer can also write script that changes the
query in the 2nd dataset based on the value in the first dataset.   All
this will require BIRT engine to do code analysis before deciding on an
execution plan.   It would be an interesting project to optimize the
execution plan of a report based on static analysis of the report design
XML.


Wenfeng
 

 


-----Original Message-----
From: birt-pmc-bounces@xxxxxxxxxxx [mailto:birt-pmc-bounces@xxxxxxxxxxx]
On Behalf Of Eric Deshayes
Sent: Friday, November 16, 2007 12:05 PM
To: birt-pmc@xxxxxxxxxxx
Subject: [birt-pmc] parallel data retrieval


Hi all,
I am not sure this is the best mailing list for such a question.. Let me
know if there is a better mailing list. At the moment, the data engine
makes all the data retrieval sequentially. So, if we are accessing two
independant datasources that respond independantly in the same amount of
time, we need to wait for both to return some data one after each other.
Wouldn't that be a good improvement to do the request in parallel, in
two different thread so the time of the data retrieval will be the time
of the longest datasource retrieval? I have no idea how feasible it is
in the current BIRT data engine design. Thanks for your
feedbacks/comments. Eric _______________________________________________
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