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Performance - Topic + Condition

I was wondering what the additional overhead looks like for Subscriptions based on topics vs Subscriptions based on Topic + Condition.  Specifically XPath expressions evaluated against the body of a message.

I know there would be a performance hit because:

  • If the message body is internally passed as a binary blob, which would be great from a memory management perspective, It would have to be parsed into an XML Structure that can be used to evaluate XPath expressions.  Effectively there would be an second copy of the message in memory.
  • Then there is the issue of the XPath evaluation itself (Parsing, Compiling, etc).

Has anyone taken a look at this?

 

Tags: Based, Condition, Content, Routing, Topic

Views: 78

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Permalink Reply by Martin Wasznicky on July 18, 2014 at 1:12pm

Performance will be affected by the size of the message...as well as the complexity of the XPath, so one test per se will not fit all cases.  As you noted...we need to load the entire message into a DOM to execute the XPATH...so we essentially copy the message in memory.

If the message body of the ESBMessage itself is a binary blob, then an XPATH will not be evaluated against it.  It will only be evaluated if the message body is xml


The routing performance hit on thruput can be as little as 30%....but could be greater...depending on the message and xpath statement

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