[jira] [Commented] (BOOKKEEPER-963) Allow to use multiple journals in bookie

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

    [ https://issues.apache.org/jira/browse/BOOKKEEPER-963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15746713#comment-15746713 ] 

ASF GitHub Bot commented on BOOKKEEPER-963:
-------------------------------------------

Github user jvrao commented on the issue:

    https://github.com/apache/bookkeeper/pull/71
  
    Crap I lost all my review comments; Will start from the beginning again. 


> 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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