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https://issues.apache.org/jira/browse/CASSANDRA-6746?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benedict reassigned CASSANDRA-6746:
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Assignee: (was: Benedict)
Reads have a slow ramp up in speed
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Key: CASSANDRA-6746
URL: https://issues.apache.org/jira/browse/CASSANDRA-6746
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Ryan McGuire
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|http://ryanmcguire.info/ds/graph/graph.html?stats=stats.2.1_vs_2.0_vs_1.2.retry1.jsonmetric=interval_op_rateoperation=stress-readsmoothing=1]
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