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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-668) long commitlog syncs can cause write pauses
Date Tue, 05 Jan 2010 17:18:54 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12796769#action_12796769
] 

Jonathan Ellis commented on CASSANDRA-668:
------------------------------------------

There's still some mystery here, because the commitlog was on a separate device + xfs filesystem,
so syncing that shouldn't have to wait for IO from the data filesystem.  But short term this
patch is better than nothing.

> long commitlog syncs can cause write pauses
> -------------------------------------------
>
>                 Key: CASSANDRA-668
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-668
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>            Priority: Minor
>             Fix For: 0.5, 0.9
>
>         Attachments: 668.patch
>
>
> on a heavily loaded system (deliberately exacerbated by running the bonnie++ i/o benchmarking
tool at the same time as cassandra -- which might not be too far off from the environment
you would see on some VPS hosts), we're seeing CL sync times of 1-5s, causing write pauses.

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