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