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From "Michael Shuler (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10714) tcp retransmission issue seen in cassandra cluster
Date Mon, 16 Nov 2015 21:44:10 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15007390#comment-15007390
] 

Michael Shuler commented on CASSANDRA-10714:
--------------------------------------------

This could be simple network issues with a NIC, switch port, or neighbor, so TCP does its
job and retransmits packets. You might see error|dropped|overruns values in ifconfig, as well.
If this persists on a particular node in your cluster, it may be prudent to destroy that node
and launch another one in the hopes that you get a more stable server.

> tcp retransmission issue seen in cassandra cluster
> --------------------------------------------------
>
>                 Key: CASSANDRA-10714
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10714
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Streaming and Messaging
>            Reporter: Jeff Liu
>
> I have been seen tcp package retransmission issue in various stacks in our environment.
( AWS with no VPC). I'm currently using hsha rpc server type on cassandra 2.1.6 version. The
information captured by wireshark shows that the retransmission happened both between client-to-server
and server-to-server. Even within a cluster that doesn't have any client traffic, sporadic
retransmission still happens.
> It's pretty easy to reproduce this issue by watching "netstat -s | grep retrans". 



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