https://bz.apache.org/bugzilla/show_bug.cgi?id=64877
Bug ID: 64877
Summary: New implementation of JDBC Based Store with better
performances
Product: Tomcat 9
Version: 9.0.39
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: p.moua...@ubik-ingenierie.com
Target Milestone: -----
Hello,
First thanks for your great product I've been using for years.
Recently, I worked on a project that uses JDBCStore.
I had to run performance tests on it.
Those tests revealed a high contention point in this component due to the
granularity of synchronization.
The impact was that 1 thread could block hundreds of others.
I would have been happy to provide stacktraces but I cannot due to NDA
constraints.
So I implemented (based on existing one) a new one with following differences:
- I kept only the dataSourceName based configuration
- I removed stateful instance variables in order to be able to lift
synchronization
This new implementation improved drastically performances.
I'll propose a PR for this.
I am aware that there is duplication with JDBCStore that could be improved but
it's a first shot and I lack of time unfortunately.
I hope you can take into account this contribution.
Regards
Philippe M.
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