https://bz.apache.org/bugzilla/show_bug.cgi?id=65136
Bug ID: 65136
Summary: Parallel deploy speedup with /manager/text servlet not
possible because of synchronized method
ManagerServlet.deploy()
Product: Tomcat 9
Version: 9.0.x
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P2
Component: Manager
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: -----
Hi, our system consists on about 80+ webapps on different servers.
Multiple webapps are deployed per Tomcat server remotely using the
manager and host-manager webapps.
This has been working fine for years, however some servers now have 5+
webapps and they are taking a long time to start. We invoke the deploy
command on the manager webapp in parallel for each webapp, in order to
attempt a reduction in total server startup time. However the speedup is
very modest. The servers have powerful Xeon multi-core servers so a
parallel speedup should be possible.
Looking at the source code for
org.apache.catalina.manager.ManagerServlet we see that the following
method is synchronized which would explain the behaviour we are seeing:
protected synchronized void deploy
(PrintWriter writer, String config, ContextName cn,
String tag, boolean update, HttpServletRequest request,
StringManager smClient) {
Is there any real reason why this needs to be synchronized? Tomcat can
deploy webapps in parallel when backgroundProcessorDelay is set to a
positive number, but this is not useful when remotely deploying webapps
using the manager webapp.
Any ideas? Thanks
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