https://bz.apache.org/bugzilla/show_bug.cgi?id=62841
Bug ID: 62841
Summary: Refactor DeltaSession locking
Product: Tomcat 9
Version: 9.0.x
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P2
Component: Cluster
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: -----
Background: https://tomcat.markmail.org/thread/26rl3hs6wjzf7ssu
It would helpful in some scenarios to reduce the scope of the DeltaSession
lock.
Currently the sequence is:
- lock session
- serialize DeltaRequest to message
- recycle DeltaRequest
- unlock session
- send message
The proposed sequence is:
- lock session
- keep reference to populated DeltaRequest
- provide session with new DeltaRequest object
- unlock session
- serialize populated DeltaRequest to message
- send message
To avoid the expense of creating a new DeltaRequest each time, a pool of them
could be used which should minimise the garbage.
Looking at the sequence of events, I don't think this does much that is
likely to harm coherence.
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