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From "Ariel Weisberg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8457) nio MessagingService
Date Tue, 06 Jan 2015 17:13:35 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14266422#comment-14266422
] 

Ariel Weisberg commented on CASSANDRA-8457:
-------------------------------------------

https://forums.aws.amazon.com/thread.jspa?messageID=459260
This looks like a Xen/EC2 issue. I'll bet bare metal never has this issue because it has multiple
interrupt vectors for NICs. The only work around is using multiple elastic network interfaces
and doing something to make that practical for intra-cluster communication.

> nio MessagingService
> --------------------
>
>                 Key: CASSANDRA-8457
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8457
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Ariel Weisberg
>              Labels: performance
>             Fix For: 3.0
>
>
> Thread-per-peer (actually two each incoming and outbound) is a big contributor to context
switching, especially for larger clusters.  Let's look at switching to nio, possibly via Netty.



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