Some things that are helpful: - What version of Cassandra - How much memory allocated to heap - How much memory allocated to direct memory for the JVM - How much memory on the full system - Do you have a heap dump? - Do you have a heap histogram? - How much data on disk? - What are your compression and bloom filter settings (both use off-heap memory and scale with size of data on disk, but should not leak)
On Thu, Jun 18, 2020 at 7:29 AM Reid Pinchback <rpinchb...@tripadvisor.com> wrote: > Just to confirm, is this memory decline outside of the Cassandra process? > If so, I’d look at crond and at memory held for network traffic. Those are > the two areas I’ve seen leak. If you’ve configured to have swap=0, then > you end up in a position where even if the memory usage is stale, nothing > can push the stale pages out of the way. > > > > *From: *Rahul Reddy <rahulreddy1...@gmail.com> > *Reply-To: *"user@cassandra.apache.org" <user@cassandra.apache.org> > *Date: *Thursday, June 18, 2020 at 10:27 AM > *To: *"user@cassandra.apache.org" <user@cassandra.apache.org> > *Subject: *Memory decline > > > > *Message from External Sender* > > Hello, > > > > Im seeing continuous decline in memory on a Cassandra instance used to > have 20g free memory 15 days back and now its 15g and continue to go down. > Same instance it caused the cassandra instance crash before. Can you please > give me some pointers to look for which is causing continuous decline in > memory >
