Biztalk Rules Engine RuleSet too complex error

Question

We call biztalk rules engine policies programatically instead of using biztalk orchestration, and we have around 2000 rules all together. We are getting the below exception intermittently and causing the cpu of web servers to spike to 100%. Please advise
if you have any suggestions.
Microsoft.RuleEngine.RuleSetTranslationComplexityException: Ruleset is too complex and translation cannot complete within the configured translation timeout interval.
   at Microsoft.RuleEngine.ReteTranslator.RuleSetToReteTranslatorImpl.ProcessRuleConditions(LogicalExpression expr, Boolean connectJoins, TimeOutControl timer)
   at Microsoft.RuleEngine.ReteTranslator.RuleSetToReteTranslatorImpl.ProcessRuleConditions(LogicalExpression expr, Boolean connectJoins, TimeOutControl timer)
   at Microsoft.RuleEngine.ReteTranslator.RuleSetToReteTranslatorImpl.ProcessRuleConditions(LogicalExpression expr, Boolean connectJoins, TimeOutControl timer)
   at Microsoft.RuleEngine.ReteTranslator.RuleSetToReteTranslatorImpl.Translate(RuleSet ruleset, Int32 duration)
   at Microsoft.RuleEngine.RuleEngine..ctor(RuleSet ruleSet, Boolean doOptimizations)
   at Microsoft.RuleEngine.RuleEngineCache.Allocate(String rulesetName, TrackingConfiguration& trackingConfig)
   at Microsoft.RuleEngine.Policy..ctor(String policyName)
Dilip Bandi

Answer 1

Hi Dilip,
Recommend you to refer this Technet article: High
CPU When Executing a Business Rules Engine (BRE) Policy
Also refer the post: RuleSetTranslationComplexityException
- Scenario...
You need to Increase the time out in the registry for the rules engine (Translation Timeout) from 1 minute ("60000") which
is default to higher value, something like 5 minutes.There is no performance impact of increasing this value.
This setting can be set in the registry or a .config file. The registry settings are global for all applications that host a rule engine instance.
Registry location:
32-bit server:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\BusinessRules\3.0
64-bit server: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\BusinessRules\3.0 
Setting these values in an application configuration file will override the values in the registry. If the policy is being executed within an IIS worker process, the web.config file
can be modified. If the policy is being executed within a BizTalk orchestration, the BTSNTSvc.exe.config or BTSNTSvc64.exe.config file can modified.
Rachit
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