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From "Alex Rudyy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-7830) Heap dominated by duplicates of common routing values / header values etc
Date Fri, 04 May 2018 15:12:00 GMT

    [ https://issues.apache.org/jira/browse/QPID-7830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16463990#comment-16463990
] 

Alex Rudyy commented on QPID-7830:
----------------------------------

I reviewed the changes. They look good to me. Though, I would add additional caching for 0-10
routing keys, exchange names (in DeliveryProperties), contentType (MessageProperties) and
1-0 "to" field (in Properties) as it would save us additional heap space and reduce frequency
and length of GC pauses.

> 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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