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https://issues.apache.org/jira/browse/ARTEMIS-2224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16737989#comment-16737989
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ASF GitHub Bot commented on ARTEMIS-2224:
-----------------------------------------
GitHub user franz1981 opened a pull request:
https://github.com/apache/activemq-artemis/pull/2494
ARTEMIS-2224 Reduce contention on LivePageCacheImpl
It includes:
- **lock-free LivePageCache + tests**:
LivePageCacheImpl has been reimplemented to be
lock-free, multi-producer and multi-consumer
in any of its operations.
- **Avoid unnecessary page cache queries on ack TX**:
PageSubscriptionImpl::ackTx is already performing a counter update
using the message persistent size: the size can be reused on
PagePosition::setPersistentSize, avoiding to query the page cache just
to compute it.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/franz1981/activemq-artemis lock-free-paging
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/activemq-artemis/pull/2494.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2494
----
----
> Reduce contention on LivePageCacheImpl
> --------------------------------------
>
> Key: ARTEMIS-2224
> URL: https://issues.apache.org/jira/browse/ARTEMIS-2224
> Project: ActiveMQ Artemis
> Issue Type: Improvement
> Components: Broker
> Affects Versions: 2.7.0
> Reporter: Francesco Nigro
> Assignee: Francesco Nigro
> Priority: Major
>
> Has been measured that LIvePageCacheImpl operations are a source of
> contention on producer side while paging.
> This contention decrease the scalability of the broker in an evident way
> while using topics, because the page cache is been accessed concurrently by
> several producers to ack transactions while the messages are being appended.
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