Hi, Sure! I attached the jstack dumps on the ticket.
Hannu On 19 December 2017 at 14:38:45, Jeff Jirsa (jji...@gmail.com) wrote: Can you grab a thread dump with jstack as well? -- Jeff Jirsa On Dec 19, 2017, at 3:32 AM, Hannu Kröger <hkro...@gmail.com> wrote: Hi, I opened a ticket about nodetool compactionstats hanging: https://issues.apache.org/jira/browse/CASSANDRA-14130 The root cause seems to be JMX metric fetching hanging. I was able to replicate it on this problematic like this: Welcome to JMX terminal. Type "help" for available commands. $>open localhost:7199 #Connection to localhost:7199 is opened $>bean org.apache.cassandra.metrics:type=Compaction,name=PendingTasksByTableName #bean is set to org.apache.cassandra.metrics:type=Compaction,name=PendingTasksByTableName $>get Value #mbean = org.apache.cassandra.metrics:type=Compaction,name=PendingTasksByTableName: // This command never finishes. This happens only on one node AFAIK. What could possibly be the problem? Hannu