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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-7830) Heap dominated by duplicates of common routing values / header values etc
Date Fri, 11 May 2018 16:32:00 GMT

    [ https://issues.apache.org/jira/browse/QPID-7830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16472215#comment-16472215

ASF subversion and git services commented on QPID-7830:

Commit 83c6dfebc3c815157ed3f04403a6968cc05eabae in qpid-broker-j's branch refs/heads/7.0.x
from [~k-wall]
[ https://git-wip-us.apache.org/repos/asf?p=qpid-broker-j.git;h=83c6dfe ]

QPID-7830: [Broker-J] [AMQP 0-8..0-91] Mechanically refactor AMQPShortString introducing factory
methods and hiding constructors

(cherry picked from commit 0a3dfc883b7af756fbdf076665eaae4ad8202bf7)

> Heap dominated by duplicates of common routing values / header values etc
> -------------------------------------------------------------------------
>                 Key: QPID-7830
>                 URL: https://issues.apache.org/jira/browse/QPID-7830
>             Project: Qpid
>          Issue Type: Bug
>          Components: Broker-J
>            Reporter: Keith Wall
>            Priority: Major
>             Fix For: Future
> When used for store and forwarding, in some use cases the Broker's heap can become dominated
by duplicates of common values such as routing information (e.g. {{amq.direct}} or an application's
queue name) or common header values (e.g a application/octet-stream or an application's user
> On the 0-8..0-91 paths, every enqueued message gets its own {{MessagePublishInfo}} referencing
its own {{AMQShortString}} exchange and routing keys.  For some use-cases, these are drawn
from a small set. On the AMQP 1.0 path, {{Properties#to}} is an example.   0-10 is probably
affected too.
> This unnecessarily increases the heap requirements of the Broker.
> The Broker should adopt a sensible intern/caching policy with the same policy applying
regardless of whether messages follow the on-line enqueue or recovery path.  Note that in
AMQP 1.0, values which are {{Symbols}} have their underlying String automatically interned.

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