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https://issues.apache.org/jira/browse/BOOKKEEPER-565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13763934#comment-13763934
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Sijie Guo commented on BOOKKEEPER-565:
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moving this task as part of BOOKKEEPER-656. will generate this patch after the
other sub tasks in, since it touches same files.
> Make an option to separate storing entry log files from index files.
> --------------------------------------------------------------------
>
> Key: BOOKKEEPER-565
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-565
> Project: Bookkeeper
> Issue Type: Sub-task
> Components: bookkeeper-server
> Reporter: Sijie Guo
> Assignee: Sijie Guo
> Fix For: 4.3.0
>
>
> Currently, the add operation will go throughput ledger storage first and
> journal later. the latency of an add operation would be affected by two
> parts, one is ledger disk and the other one is journal disk. And flushing
> ledger index files might cause random i/o, which would affect adding entries
> to ledger storage in a higher workload.
> there are several ideas to resolve this problem, one is aggregate the
> per-file index into several files to make flushing more sequential.
> this jira is a simple solution to separate the disks to avoid disk
> contention. it is a straightforward way w/ less risk, but not a perfect way
> which might waste an extra disk and bandwidth.
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