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From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-6843) Reclaim overwritten off-heap memtable space early
Date Wed, 26 Mar 2014 11:11:14 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13947806#comment-13947806
] 

Benedict edited comment on CASSANDRA-6843 at 3/26/14 11:11 AM:
---------------------------------------------------------------

I had no intention of getting into a proper discussion about the results, as they are not
remotely rigorous, nor are they a main justification for this patch; more extensive testing
is necessary, and this patch mostly enables other adaptations, so I didn't see the point of
wasting time on either count; however, since you ask, I was testing a single node with:

cassandra-stress write n=1000000 -key dist=uniform\(1..100000\) -col n=fixed\(1\) size=fixed\(1000\)
-mode thrift -rate threads=50

Which yielded rates of 22Kop/s without vs 50Kop/s with; with rates dropping to 40Kop/s throughput
for this patch when number of records inserted was bumped to 5M, as the CL became a bottleneck.


was (Author: benedict):
I had no intention of getting into a proper discussion about the results, as they are not
remotely rigorous, nor are they a main justification for this patch; more extensive testing
is necessary, and this patch mostly enables other adaptations, so I didn't see the point of
wasting time on either count; however, since you ask, I was testing a single node with:

cassandra-stress write n=1000000 -key dist=uniform\(1..10000\) -col n=fixed\(1\) size=fixed\(10000\)
-mode thrift -rate threads=50

Which yielded rates of 22Kop/s without vs 50Kop/s with; with rates dropping to 40Kop/s throughput
for this patch when number of records inserted was bumped to 5M, as the CL became a bottleneck.

> Reclaim overwritten off-heap memtable space early
> -------------------------------------------------
>
>                 Key: CASSANDRA-6843
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6843
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Benedict
>            Assignee: Benedict
>              Labels: performance
>             Fix For: 3.0
>
>
> Perform GC on the off-heap memtable arenas



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