[jira] [Commented] (ARTEMIS-2224) Reduce contention on LivePageCacheImpl

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARTEMIS-2224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16737989#comment-16737989 ] 

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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