[jira] [Created] (ARTEMIS-4056) Optimize Paging Startup And Management operation

["Clebert Suconic (Jira)" <ji...@apache.org>]

Clebert Suconic created ARTEMIS-4056:
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             Summary: Optimize Paging Startup And Management operation
                 Key: ARTEMIS-4056
                 URL: https://issues.apache.org/jira/browse/ARTEMIS-4056
             Project: ActiveMQ Artemis
          Issue Type: Improvement
            Reporter: Clebert Suconic


When there are a lot of queues paging, there are a few issues:

- A few management operations are calling iterator(); and flushExecutors(). What may put the server down.
- Paging is eventually reading pages even when they are complete (to just discard their value, when there is a page-complete record).
- Paging is calling checkDepage() during reload, what will eventually delay startup time.

- The main one: getFirstMessage() on QueueControl is calling an iterator(); Such iterator might put a lot of pressure in paging. (Imaging if you had 100 queues in a paged address. all of them would be issuing the iterator().



Tests are optimizations and the servers should just behave the same without them.




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