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


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:
>             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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