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https://issues.apache.org/jira/browse/AMQ-6164?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gary Tully resolved AMQ-6164.
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Resolution: Fixed
multiple producers on a single destination can now get the benefit of write
batching to the journal. They can benefit from a shared disk fsync.
Depending on your disk speed and usage pattern, this can increase through put
> queue sendLock prevents concurrent journal updates
> --------------------------------------------------
>
> Key: AMQ-6164
> URL: https://issues.apache.org/jira/browse/AMQ-6164
> Project: ActiveMQ
> Issue Type: Improvement
> Components: Broker, Message Store
> Affects Versions: 5.13.0
> Reporter: Gary Tully
> Assignee: Gary Tully
> Fix For: 5.14.0
>
>
> concurrent producers contend on the queue sendlock rather than on the
> journal, preventing batching or in the case of jdbc, concurrent writes to the
> db.
> The sendlock protects message order, however order is ultimately determined
> by the sequence id assigned by the persistence adapter.
> The ground work for aligning the cursors with the journal sequence ids was
> layed in https://issues.apache.org/jira/browse/AMQ-4485 and
> https://issues.apache.org/jira/browse/AMQ-5266
> With the ordering between transacted and non transacted producers overlapping
> the cursor already respects the journal ordering, the sendLock need no longer
> protect the journal update.
> With parallel journal updates we get the benefit of write batching (sharing
> an fsync) for multiple producers on a single destination.
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