{"action":"created","issue":{"url":"https://api.github.com/repos/scylladb/scylla/issues/419","labels_url":"https://api.github.com/repos/scylladb/scylla/issues/419/labels{/name}","comments_url":"https://api.github.com/repos/scylladb/scylla/issues/419/comments","events_url":"https://api.github.com/repos/scylladb/scylla/issues/419/events","html_url":"https://github.com/scylladb/scylla/issues/419","id":108876758,"number":419,"title":"scylla-jmx uses high CPU, possibly crashing","user":{"login":"tvaillancourt","id":5142847,"avatar_url":"https://avatars.githubusercontent.com/u/5142847?v=3","gravatar_id":"","url":"https://api.github.com/users/tvaillancourt","html_url":"https://github.com/tvaillancourt","followers_url":"https://api.github.com/users/tvaillancourt/followers","following_url":"https://api.github.com/users/tvaillancourt/following{/other_user}","gists_url":"https://api.github.com/users/tvaillancourt/gists{/gist_id}","starred_url":"https://api.github.com/users/tvaillancourt/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tvaillancourt/subscriptions","organizations_url":"https://api.github.com/users/tvaillancourt/orgs","repos_url":"https://api.github.com/users/tvaillancourt/repos","events_url":"https://api.github.com/users/tvaillancourt/events{/privacy}","received_events_url":"https://api.github.com/users/tvaillancourt/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":{"login":"amnonh","id":2118079,"avatar_url":"https://avatars.githubusercontent.com/u/2118079?v=3","gravatar_id":"","url":"https://api.github.com/users/amnonh","html_url":"https://github.com/amnonh","followers_url":"https://api.github.com/users/amnonh/followers","following_url":"https://api.github.com/users/amnonh/following{/other_user}","gists_url":"https://api.github.com/users/amnonh/gists{/gist_id}","starred_url":"https://api.github.com/users/amnonh/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/amnonh/subscriptions","organizations_url":"https://api.github.com/users/amnonh/orgs","repos_url":"https://api.github.com/users/amnonh/repos","events_url":"https://api.github.com/users/amnonh/events{/privacy}","received_events_url":"https://api.github.com/users/amnonh/received_events","type":"User","site_admin":false},"milestone":null,"comments":10,"created_at":"2015-09-29T14:04:48Z","updated_at":"2015-10-29T13:49:46Z","closed_at":null,"body":"Hey guys,\r\n\r\nI've noticed that at all times, Scylla-JMX is using a lot of CPU, a lot more than I would expected considering what this process does, but perhaps I am misunderstanding.\r\n\r\nAfter looking bit closer at the high CPU, I have a suspicion that Java is crashing. Watching top, every few minutes all Java processes/threads for Scylla-JMX disappear and then come back as a new PID with high CPU, probably due to setting up Java, JIT, etc.\r\n\r\nSo far I haven't been able to grab a jstack from right before the crash. I was curious what details the Scylla team recommends I provide to assist with troubleshooting? Is it possible to enable debug logging under the Scylla-JMX process?\r\n\r\nHere is a paste containing my environment, and also 2 process-lists (30 seconds apart) showing the the daemon is changing PIDs, and using 40-67% CPU.\r\n\r\nEDIT: one missing detail I forgot is I've added the following to the JVM flags for the JMX process: \"-Xms512M -Xmx512M -XX:NewSize=256M\", to keep RAM in-check.\r\n\r\nPaste: http://pastebin.com/ywFm5jxh\r\n\r\nThanks!\r\n\r\nTim"},"comment":{"url":"https://api.github.com/repos/scylladb/scylla/issues/comments/152184318","html_url":"https://github.com/scylladb/scylla/issues/419#issuecomment-152184318","issue_url":"https://api.github.com/repos/scylladb/scylla/issues/419","id":152184318,"user":{"login":"penberg","id":81939,"avatar_url":"https://avatars.githubusercontent.com/u/81939?v=3","gravatar_id":"","url":"https://api.github.com/users/penberg","html_url":"https://github.com/penberg","followers_url":"https://api.github.com/users/penberg/followers","following_url":"https://api.github.com/users/penberg/following{/other_user}","gists_url":"https://api.github.com/users/penberg/gists{/gist_id}","starred_url":"https://api.github.com/users/penberg/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/penberg/subscriptions","organizations_url":"https://api.github.com/users/penberg/orgs","repos_url":"https://api.github.com/users/penberg/repos","events_url":"https://api.github.com/users/penberg/events{/privacy}","received_events_url":"https://api.github.com/users/penberg/received_events","type":"User","site_admin":false},"created_at":"2015-10-29T13:49:46Z","updated_at":"2015-10-29T13:49:46Z","body":"@tvaillancourt @amnonh What's the status of this issue? Can we close it?"}}