CLONE -Changing terracotta config file without restart using JMX
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Key: CDV-409
URL: https://jira.terracotta.org/jira//browse/CDV-409
Project: Community Development
Issue Type: New Feature
Reporter: Erez Harari
Assigned To: Issue Review Board
from http://forums.terracotta.org/forums/posts/list/375.page
erezhara:
is there a JMX alternative, i.e. using a JMX client to change the settings that
were originally loaded from the config file?
ari
please provide a feature request in a JIRA, erezhara. Taylor and Steve are
currently at work on the runtime-changeable capabilities for an upcoming
release. There are a few things that we could expose through JMX such as
"object pre-fetch depth" and "log level" or "debug mode" of some sort. There
are even more things we could do such as "add another passive Terracotta server
to the list".
As zeeiyer points out, though, changing locks and roots at runtime would be
difficult to figure out for us. Example: adding some static named "foo" as a
new root after 3 days of operation. Each JVM will have its own state for "foo".
Which version wins? We can't figure that out and definitely cannot configure it
without breaking many of the running app instances / threads that are currently
relying on certain data in "foo".
A better example would be locking. If we allowed the introduction of locks at
runtime, you could easily deadlock. If you removed locks at runtime, you would
likely introduce race conditions.
Make sense? Please file the JIRA for the types of things you want to see,
though...we are very interested and working on this feature RIGHT NOW.
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