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From "Ryan McGuire (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-6746) Reads have a slow ramp up in speed
Date Sun, 23 Mar 2014 21:23:45 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-6746?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ryan McGuire updated CASSANDRA-6746:
------------------------------------

    Attachment: 6746.buffered_io_tweaks.logs.tar.gz

I'm using java 1.7.0_51. Using a default cassandra.yaml except for the disk_access_mode:standard
setting. I don't see anything weird in the logs, but I've uploaded them if you want to check
them out (6746.buffered_io_tweaks.logs.tar.gz).

> Reads have a slow ramp up in speed
> ----------------------------------
>
>                 Key: CASSANDRA-6746
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6746
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Ryan McGuire
>            Assignee: Benedict
>              Labels: performance
>             Fix For: 2.1 beta2
>
>         Attachments: 2.1_vs_2.0_read.png, 6746-buffered-io-tweaks.png, 6746-patched.png,
6746.blockdev_setra.full.png, 6746.blockdev_setra.zoomed.png, 6746.buffered_io_tweaks.logs.tar.gz,
6746.txt, buffered-io-tweaks.patch, cassandra-2.0-bdplab-trial-fincore.tar.bz2, cassandra-2.1-bdplab-trial-fincore.tar.bz2
>
>
> On a physical four node cluister I am doing a big write and then a big read. The read
takes a long time to ramp up to respectable speeds.
> !2.1_vs_2.0_read.png!
> [See data here|http://ryanmcguire.info/ds/graph/graph.html?stats=stats.2.1_vs_2.0_vs_1.2.retry1.json&metric=interval_op_rate&operation=stress-read&smoothing=1]



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