Hiya, We have our Cassandra 2.1 cluster being monitored by checking the JMX on the org.apache.cassandra.metrics type=ThreadPools bean
We've got a threshold of 15 for warnings as per https://blog.pythian.com/guide-to-cassandra-thread-pools/ however we don't know if this is a sensible warning threshold as this does occasionally warn at the moment however there is no real obvious cause in the Cassandra logs. So 2 questions: - What does this thread-pool actually do? All the examples are so abstract i.e. "executes callbacks"; my understanding is that if a client queries the cluster and then never reads the result it would be in the RequestResponseStage Pending until it times out? - Is there any tracing or similar that can be used to inspect the content of the thread-pool so we can see what it actually is that's pending? -- Robert Emery -- <https://codeweavers.net> <http://us15.campaign-archive1.com/?u=fcb361cfa194cf70551bc5169&id=f556b0bf09> Codeweavers January Newsletter <https://us15.campaign-archive.com/?u=fcb361cfa194cf70551bc5169&id=b515f5ce0f> l *Codeweavers 2017 Review Infographic <https://codeweavers.net/company-blog/codeweavers-2017-review-infographic>* <https://docs.google.com/forms/d/e/1FAIpQLSfbXA6qnYxYDZKlHkh_1Tqgpp_KdOK4EmFT7b5aF6vtVkF4Xg/viewform> *What updates would you like to receive from Codeweavers via email? <https://docs.google.com/forms/d/e/1FAIpQLSfbXA6qnYxYDZKlHkh_1Tqgpp_KdOK4EmFT7b5aF6vtVkF4Xg/viewform>* *Phone:* 0800 021 0888 * Email: *contac...@codeweavers.net *Codeweavers Ltd* | Barn 4 | Dunston Business Village | Dunston | ST18 9AB Registered in England and Wales No. 04092394 | VAT registration no. 974 9705 63 <https://www.linkedin.com/company/codeweavers-limited> <https://vimeo.com/codeweaversltd> [image: https://plus.google.com/b/105942302039373248738/+CodeweaversNet] <https://plus.google.com/b/105942302039373248738/+CodeweaversNet> [image: https://twitter.com/CodeweaversTeam] <https://twitter.com/CodeweaversTeam> --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org For additional commands, e-mail: user-h...@cassandra.apache.org
