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https://issues.apache.org/jira/browse/BOOKKEEPER-963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15630479#comment-15630479
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Venkateswararao Jujjuri (JV) commented on BOOKKEEPER-963:
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[~ayegorov] FYI
> Allow to use multiple journals in bookie
> ----------------------------------------
>
> Key: BOOKKEEPER-963
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-963
> Project: Bookkeeper
> Issue Type: Improvement
> Reporter: Matteo Merli
> Assignee: Matteo Merli
> Fix For: 4.5.0
>
>
> By configuring multiple journals, we can take advantage of the IO of multiple
> disks to increase the write throughput of a single bookie.
> Each journal will have its own journal and sync threads and writes will be
> assigned to a particular journal by hashing on the ledger id.
> In addition to using multiple physical disks, there can improvements even by
> using multiple journal on a single SSD device, because these disks can handle
> well multiple concurrent writes in different blocks of the disk.
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