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https://issues.apache.org/jira/browse/AMQ-5603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14329131#comment-14329131
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Christian Posta commented on AMQ-5603:
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work started here
https://github.com/christian-posta/activemq/commit/db1335d5883a4943c7d1cb6cef21d534676cafbb#diff-10aa392dba6f176b982ddd0229c2c407R118
> Consider preallocation of journal files in batch increments
> -----------------------------------------------------------
>
> Key: AMQ-5603
> URL: https://issues.apache.org/jira/browse/AMQ-5603
> Project: ActiveMQ
> Issue Type: New Feature
> Components: Message Store
> Reporter: Christian Posta
> Priority: Minor
> Labels: kahaDB, perfomance
>
> Right now (as of ActiveMQ 5.12 release) we preallocate journal files, but the
> only scope is for entire journal file. The [potential] issue with that is if
> user configures large journal file sizes, we can end up stalling writes
> during log rotation because of the allocation process. There are two ways to
> do the allocation, configurable to do it in userspace, or defer to kernel
> space, but nevertheless it would be good to avoid this issue altogether by
> preallocating in small batch sizes regardless of the journal max file size.
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