Inconsistency in managed session set under heavy load
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Key: DIRMINA-549
URL: https://issues.apache.org/jira/browse/DIRMINA-549
Project: MINA
Issue Type: Bug
Components: Core
Affects Versions: 1.1.6, 1.0.9
Reporter: Trustin Lee
Assignee: Trustin Lee
Priority: Critical
Fix For: 1.0.10, 1.1.7
The detailed analysis can be found at:
http://mina.markmail.org/search/?q=sessionClosed%20is%20not%20called%20sometimes#query:sessionClosed%20is%20not%20called%20sometimes+page:1+mid:cc5uj66xt5mb5rrs+state:results
The thing is that IoServiceListenerSupport.fireSessionCreated() and
fireSessionDestroyed() can be invoked at the same time by more than one I/O
processor threads, and that can cause sessionClosed event is not fired at all
under heavy load. The solution is to acquire a per-service lock whenever
managed session set changes. So far, we were acquiring locks separated as two
phases, and that was the root cause of the problem. By fixing this issue,
performance might decrease slightly, but accuracy is the first concern for us.
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