Observation: avoid running out of memory
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Key: JCR-2402
URL: https://issues.apache.org/jira/browse/JCR-2402
Project: Jackrabbit Content Repository
Issue Type: Improvement
Components: jackrabbit-core, observation
Reporter: Thomas Mueller
Assignee: Thomas Mueller
Jackrabbit uses an unbounded observation queue for event listeners (for
asynchronous listeners, which are the default). If an observation listener is
very slow, the observation queue gets larger and larger, and the JVM will
eventually run out of memory.
I suggest to use a maximum queue size of 100'000 by default. Adding new events
to the queue will block until the observation listeners removed an item. I'm
not sure if we need a way to configure this option; probably a system property
is enough as a start (we can still add a better way to configure this setting
if it turns out somebody actually needs a different value).
A special case is observation listeners that themselves write to the repository
and therefore cause new events. In this case, it doesn't make sense to block
adding an event, because that would block the whole system. However a warning
should be written to the log file.
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