Darrel Schneider created GEODE-9736:
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Summary: publishes that find no pattern subscribers can cause
server to run out of memory
Key: GEODE-9736
URL: https://issues.apache.org/jira/browse/GEODE-9736
Project: Geode
Issue Type: Bug
Components: redis
Reporter: Darrel Schneider
Currently each time a publish is done the server will check existing pattern
subscribers to see if they want the publish. If it finds no subscribers it
remembers that and the publish channel.
Since you can just keep making up new publish channels that have no memory,
remembering these can cause the server to run out of memory.
If you hit this problem you will see an instance of PatternSubscriptionManager
with a large "patternSubscriptionCache" ConcurrentHashMap. It will be full of
entries whose value is an instance of Collections$EmptyList
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