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Posted to dev@qpid.apache.org by "Kim van der Riet (Jira)" <ji...@apache.org> on 2020/03/26 16:56:00 UTC
[jira] [Reopened] (QPID-8430) [qpid-cpp] Excessive memory use when
rerouting messages
[ https://issues.apache.org/jira/browse/QPID-8430?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kim van der Riet reopened QPID-8430:
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If a message contains a non-empty-string trace (key "x-qpid.trace"), this fix does not prevent each reroute from re-copying the message as a part of rerouting, and thus for the memory to grow as before the patch. Each reroute is supposed to set the value of this key to the empty string, and subsequent reroutes should not need to recopy the message. However, testing has shown that the test for the presence of the key and its value (using *Message.getPropertyAsString()*) always returns the value of the original message trace annotation, and is thus allowing the trace annotation to be unset over and over, each time with a message deep copy for each reroute.
> [qpid-cpp] Excessive memory use when rerouting messages
> -------------------------------------------------------
>
> Key: QPID-8430
> URL: https://issues.apache.org/jira/browse/QPID-8430
> Project: Qpid
> Issue Type: Bug
> Components: C++ Broker
> Reporter: Kim van der Riet
> Assignee: Kim van der Riet
> Priority: Major
>
> When a message is rerouted several times, the broker's used memory increases rapidly. This is counter-intuitive, considering that the messages themselves are only passing from one queue to another. There is no evidence of a leak, however, only a large growth in consumed memory.
> An investigation has shown that the process of clearing traces from the message when rerouting (whether they exist or not) causes the message and its frames to be copied (for reasons of avoiding locks on the message, which can affect performance).
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