[jira] [Commented] (BOOKKEEPER-1041) Multiple active entrylogs

["Enrico Olivelli (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BOOKKEEPER-1041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15976235#comment-15976235 ] 

Enrico Olivelli commented on BOOKKEEPER-1041:
---------------------------------------------

{quote}
 But this is very inefficient for HDDs
{quote}

[~jujjuri]
did you mean SSD ? 

> Multiple active entrylogs
> -------------------------
>
>                 Key: BOOKKEEPER-1041
>                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-1041
>             Project: Bookkeeper
>          Issue Type: Improvement
>          Components: bookkeeper-server
>            Reporter: Venkateswararao Jujjuri (JV)
>            Assignee: Charan Reddy Guttapalem
>
> Current bookkeeper is tuned for rotational HDDs. It has one active entrylog, and all the ledger/entries go to the same entrylog until it is rotated out. This is perfect for HDDs as seeks and moving head allover the disk platter is very expensive. But this is very inefficient for HDDs, as each HDD can handle multiple parallel writers, also this method is extremely inefficient for compaction as it causes write amplification and inefficient disk space usage.
> Our proposal is to have multiple active entrylogs and a configuration param on how many parallel entrylogs the system can have. This way one can have ability to configure to have less (may be  one) ledger per entrylog.



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