https://bz.apache.org/bugzilla/show_bug.cgi?id=62501
Bug ID: 62501
Summary: Race condition (?) in session attribute replication
Product: Tomcat 9
Version: 9.0.8
Hardware: PC
OS: Linux
Status: NEW
Severity: major
Priority: P2
Component: Cluster
Assignee: dev@tomcat.apache.org
Reporter: antosh...@mail.ru
Target Milestone: -----
Default cluster configuration from documentation (SimpleTcpCluster). 2 nodes.
I implemented javax.servlet.Filter to add some data to a session just after
login. And from time to time it does not replicated on stand by server. To
investigate problem i connected to tomcat with remote debug and added some
debug messages. Here is output:
1) session created 0BDAA9C29A23767A928DD59A6AC30F4E
2) receive session id change
SESSION-ID-CHANGED#localhost#/Midlevel#0BDAA9C29A23767A928DD59A6AC30F4E, found
delta session DeltaSession[0BDAA9C29A23767A928DD59A6AC30F4E]
3) execute id change: old id = 0BDAA9C29A23767A928DD59A6AC30F4E new id =
C760E8517DE686E79A1D08DD8A685465
4) handleSESSION_DELTA delta session id = C760E8517DE686E79A1D08DD8A685465
found session = DeltaSession[C760E8517DE686E79A1D08DD8A685465]
5) receive session id change
SESSION-ID-CHANGED#localhost#/Midlevel#C760E8517DE686E79A1D08DD8A685465 delta
session DeltaSession[C760E8517DE686E79A1D08DD8A685465]
6) handleSESSION_DELTA delta session id = 21952C40B449448726888BFEF0263FAD
found session = null
7) execute id change: old id = C760E8517DE686E79A1D08DD8A685465 new id =
21952C40B449448726888BFEF0263FAD
on line 5) standby receive command to change id, but before change id happens
delta message (already with new id) was received and not found session as a
result session attribute was lost.
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