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From "Paulo Motta (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8888) Compress only inter-dc traffic by default
Date Mon, 28 Mar 2016 17:45:25 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15214541#comment-15214541
] 

Paulo Motta commented on CASSANDRA-8888:
----------------------------------------

LGTM, even though current default traffic compression if not specified on {{cassandra.yaml}}
is {{none}} on {{Config}} so I think we should keep it for users relying on this.

minor nit: you should add the {{CHANGES.txt}} entry to the latest affected version, in this
case 3.6 (trunk). Since this is an improvement it doesn't go on 3.0.x.

submitted tests and will mark as ready to commit if it looks good after this.

||trunk||
|[branch|https://github.com/apache/cassandra/compare/trunk...pauloricardomg:trunk-8888]|
|[testall|http://cassci.datastax.com/view/Dev/view/paulomotta/job/pauloricardomg-trunk-8888-testall/lastCompletedBuild/testReport/]|
|[dtest|http://cassci.datastax.com/view/Dev/view/paulomotta/job/pauloricardomg-trunk-8888-dtest/lastCompletedBuild/testReport/]|

> Compress only inter-dc traffic by default
> -----------------------------------------
>
>                 Key: CASSANDRA-8888
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8888
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Streaming and Messaging
>            Reporter: Matt Stump
>              Labels: lhf
>             Fix For: 3.x
>
>         Attachments: 8888-3.0.txt
>
>
> Internode compression increases GC load, and can cause high CPU utilization for high
throughput use cases. Very rarely are customers restricted by intra-DC or cross-DC network
bandwidth. I'de rather we optimize for the 75% of cases where internode compression isn't
needed and then selectively enable it for customers where it would provide a benefit. Currently
I'm advising all field consultants disable compression by default.



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