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From "Benedict (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-6746) Reads have a slow ramp up in speed
Date Tue, 22 Apr 2014 19:16:22 GMT


Benedict commented on CASSANDRA-6746:

I've updated the ticket to a minor improvement and moved it to no-release for now, as CASSANDRA-6916
looks to solve the regression; not sure if you still want to investigate the read-ahead changes
you were looking at still though as an improvement, [~xedin]? If not I'll resolve the ticket.

> Reads have a slow ramp up in speed
> ----------------------------------
>                 Key: CASSANDRA-6746
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Ryan McGuire
>            Assignee: Benedict
>            Priority: Minor
>              Labels: performance
>         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.buffered_io_tweaks.write-flush-compact-mixed.png, 6746.buffered_io_tweaks.write-read-flush-compact.png,
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|]

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