[jira] [Commented] (CASSANDRA-3411) Pre-allocated, Recycled Commitlog Segment Files

["Jonathan Ellis (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-3411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13137334#comment-13137334 ] 

Jonathan Ellis commented on CASSANDRA-3411:
-------------------------------------------

can you add a check that segment size * preallocated segments <= total commitlog size parameter?
                
> Pre-allocated, Recycled Commitlog Segment Files
> -----------------------------------------------
>
>                 Key: CASSANDRA-3411
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3411
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Rick Branson
>            Priority: Minor
>         Attachments: 001-pre-allocated-recycled-commitlog-segment-files-CASSANDRA-3411.patch
>
>
> An approach for improving commitlog performance is to pre-allocate the full 128MB segment files and reuse them once all the mutations have been flushed. Pre-allocation allows writes to be performed without modifying the file size metadata, and should (in theory) allow the filesystem to allocate a contiguous block of space for the file. Recycling the segment files prevents the overhead of pre-allocation from impacting overall performance.

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