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https://issues.apache.org/jira/browse/CASSANDRA-11504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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C. Scott Andreas resolved CASSANDRA-11504.
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Resolution: Information Provided
> Slow inter-node network growth & gc issues with uptime
> ------------------------------------------------------
>
> Key: CASSANDRA-11504
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11504
> Project: Cassandra
> Issue Type: Bug
> Environment: Cassandra 2.1.13 & 2.2.5
> Reporter: Jeff Griffith
> Priority: Major
> Attachments: InterNodeTraffic.jpg
>
>
> We are looking for help troubleshooting our production environment where we
> are experiencing GC problems. After much experimentation and troubleshooting
> with various settings, the only correlation that we can find with a slow
> growth in GC is a slow growth in network traffic BETWEEN cassandra nodes in
> our cluster. As an example, I have attached an example where in a cluster of
> 24 nodes, i restarted 23 of them. Note that the outgoing rate for that 24th
> node remains high while all others drop after the restart. Also note that
> this graph is ONLY traffic between cassandra nodes. Traffic from the clients
> remains FLAT throughout. Analyzing column family stats shows they are flat
> throughout. Cache hit rates are also consistent across nodes. GC is of course
> its own can of worms so we are hoping this considerable increase in traffic
> (more than double over the course of 6rs) between nodes explains it. We would
> greatly appreciate any ideas as to why this extra network output correlates
> to uptime or ideas on what to "diff" between the nodes.
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