[jira] [Commented] (CASSANDRA-11504) Slow inter-node network growth & gc issues with uptime

["C. Scott Andreas (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-11504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16691271#comment-16691271 ] 

C. Scott Andreas commented on CASSANDRA-11504:
----------------------------------------------

Hello, sorry for the delay in reply on this issue. This bug tracker is primarily used by contributors of the Apache Cassandra project toward development of the database itself. If this is still an issue, can you reach out to the user's list or public IRC channel? A member of the community may be able to help.

Here's a page with information on the best channels for support: http://cassandra.apache.org/community/

If you're still experiencing this issue and believe it may be a bug in Cassandra, please feel free to reopen.

> 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.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

---------------------------------------------------------------------
To unsubscribe, e-mail: commits-unsubscribe@cassandra.apache.org
For additional commands, e-mail: commits-help@cassandra.apache.org