https://issues.apache.org/bugzilla/show_bug.cgi?id=57323
Bug ID: 57323
Summary: Correct display of outdated sessions in sessions count
listing in Manager application
Product: Tomcat 7
Version: 7.0.57
Hardware: PC
Status: NEW
Severity: minor
Priority: P2
Component: Manager
Assignee: dev@tomcat.apache.org
Reporter: knst.koli...@gmail.com
A minor issue, reported in Re:r1614165,
http://markmail.org/message/4iplahbcanujbqoo
The Manager application has commands that display distribution of sessions
according to their idle time. (The commands are "/text/sessions",
"/text/expire" in Test GUI and "Expire Sessions" button in HTML GUI.)
The commands display how many sessions have idle time <1 minute, from 1 up to 2
minutes (1 - <2), from 2 to 3 (2 - <3) and so on.
Lets assume that a web application is configured with session-timeout of 30
minutes. Before r1614165 (in 7.0.56)/r1614163 (in 8.0.11) the last time slot in
that statistics was labeled ">= 30". In those revisions it was fixed to be
labeled "29 - <30".
Actually it should have been labeled ">= 29", as sessions that have idle time
more than 30 minutes are actually added to the value,
else if (time >= maxCount)
timeout[maxCount-1]++;
It would be better to count outdated sessions in a separate time slot, so that
"29 - <30" and ">=30" were two distinct numbers.
One may see ">=30" sessions if the thread that performs expiration have not run
yet (or is stuck).
An incorrect configuration to test this behaviour:
1. Configure examples application with the following text in its web.xml
<session-config>
<session-timeout>2</session-timeout>
</session-config>
and the following META-INF/context.xml
<Context backgroundProcessorDelay="10"/>
2. Configure a user with roles manager-script and manager-gui. Start Tomcat.
3. Visit example webapp -> Servlet examples -> Session example to create a
session.
4. Visit http://localhost:8080/manager/html, click on sessions number on the
row for the examples webapp. A list of sessions opens. Use it to check idle
time of the session.
5. Visit http://localhost:8080/manager/text/sessions?path=/examples to see
sessions statistics.
6. Wait for 2 minutes.
Expected output of /text/sessions command is that you have a session that is
idle for more than 2 minutes.
Actual output is "1 - <2 minutes: 1 sessions"
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