[rules-users] Drools stateless session question

[Shah, Malay]

Hi All,

We have an application that uses drools stateless session over a set of 35000 objects (taking about 40 MB heap) of different types. During profiling, I saw that for rules that perform joins between two huge object types data sets, lots of org.drools.reteoo.LeftTuple objects causing out of memory errors. We are using 5G heap, and have set property drools.sequential=true too. Is there any way we can decrease the memory usage while applying these rules? Drools documentation mentions  for sequential mode, we should do the following, some of them I am not sure how to set:

 *   Turn off all node memories, except the right-input Object memory.

 *   Disconnect the LeftInputAdapterNode propagation, and have the Object plus the Node referenced in a Command object, which is added to a list on the WorkingMemory for later execution.

 *   Assert all objects, when all assertions are finished and thus right-input node memories are populated check the Command list and execute each in turn.

http://downloads.jboss.com/drools/docs/4.0.7.19894.GA/html_single/index.html#d0e1295

Do we need to set some properties in RuleBaseConfiguration to make sure node memories are switched off? It would be great if we can somehow decrease the memory usage for stateless sessions? Has anybody come across such memory issues before? Correct me if I am wrong, but I think 35000 objects is not a lot of data for causing such issues.

Thanks
Malay

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