[jira] [Created] (QPID-4557) [Java broker] producer flow control functionality can retain sessions in the 'blocked' list longer than necessary, potentially leading to excessive memory use

["Robbie Gemmell (JIRA)" <ji...@apache.org>]

Robbie Gemmell created QPID-4557:
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             Summary: [Java broker] producer flow control functionality can retain sessions in the 'blocked' list longer than necessary, potentially leading to excessive memory use
                 Key: QPID-4557
                 URL: https://issues.apache.org/jira/browse/QPID-4557
             Project: Qpid
          Issue Type: Bug
          Components: Java Broker
    Affects Versions: 0.20, 0.18, 0.16, 0.14, 0.12, 0.10, 0.8, 0.6
         Environment: The producer flow control functionality can retain sessions in the 'blocked' list longer than necessary, leading to eexcessive use of memory.

Currently the sessions are only removed from the 'blocked' list they are placed in when the queue depth exceeds the configrued 'capacity' at the point when the queue depth goes below the 'flow resume capacity' again. If the queue never does this, then sessions are never removed from the lsit and get retained. This can lead to excessive memory uae where a session-per-message pattern is occurring with the producers.

We should look to ensure that closed sessions can be released from memory without requiring the queue becomes 'underfull' again, e.g by use of weak references or some sort of notification.
            Reporter: Robbie Gemmell




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