Hi Folks,
When running some clustering performance tests with message tracing
turned on, I noticed that there was significant performance degradation.
This did not have anything to do with clustering. The reason was that a
typical test would do 100,000 request-response iterations.
We were using a database based trace persister, and once the messages
table grew extremely large, the performance significantly degraded. In
order to rectify this, I've introduced a memory based trace persister
which utilizes a circular buffer. This buffer holds only a few hundred
messages at a time. Also, the SOAPEnvelope object is kept in the buffer,
instead of completely building the envelope and keeping it as a
java.lang.String, like it was done earlier. The envelope will be built
only when somebody tries to view the actual messages.
The users can switch between the database based persistence & memory
based persistence using an Axis2 parameter. The default used in WSAS
will be the memory based one.
Thanks
Azeez
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