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https://issues.apache.org/jira/browse/QPID-7830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16472217#comment-16472217
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ASF subversion and git services commented on QPID-7830:
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Commit 995d535bdea6fb5efcab9c165dbd9c807f94e72e 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=995d535 ]
QPID-7830: [Broker-J] [AMQP 0-8..0-91] Cache AMQPShortStrings that relate to
exchanges/routing keys and header values (that are usually drawn from a small
domain) in a time/size bound cache.
Intent is to reduce the amount of tenured garbage produced when messages are
repeatedly sent to same destination. This should reduce frequency and length of
GC pauses.
(cherry picked from commit 7d7b50824ad9f2a99b7de034ef36a529129b00ac)
> 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 id).
> 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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