Andrzej Rusin created IMAP-371:
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Summary: MailboxManager::getMailbox called very often
Key: IMAP-371
URL: https://issues.apache.org/jira/browse/IMAP-371
Project: James Imap
Issue Type: Improvement
Components: Processor
Affects Versions: 0.3
Reporter: Andrzej Rusin
Assignee: Eric Charles
MailboxManager::getMailbox(MailboxPath mailboxPath, MailboxSession session) is
getting called extremely often.
On my custom RDBMS-based Mailstore implementation it is the biggest hot spot.
I had to resort to caching the return value of it on Memcache, but even after
that it uses up around 15% of spent CPU time. It is far too much in my opinion.
(before I started caching it, fully indexed RDBMS getting of the mailbox was
taking more than 50% of the global RDBMS load).
My suspect is the method AbstractMailboxProcessor::addFlagsResponses(final
ImapSession session, final SelectedMailbox selected, final
ImapProcessor.Responder responder, boolean useUid).
It gets the mailbox from MessageManager each time, even if it may be not
needed.
This method is called in many CommandProcessors during the unsolicitedResponses
phase.
After I am able to really profile and confirm that it's the core of problem, I
will provide a patch.
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