Hi jeff, Provided information below. How can i check how much memory allocated to direct memory for jvm
On Thu, Jun 18, 2020 at 11:38 AM Jeff Jirsa <jji...@gmail.com> wrote: > Some things that are helpful: > > - What version of Cassandra > 3.11.3 > - How much memory allocated to heap > Max_heap_size 8G Heap_new_size is 800M > - How much memory allocated to direct memory for the JVM > - How much memory on the full system > 32G > - Do you have a heap dump? > nope, but its enabled in jvm options > > - Do you have a heap histogram? > nope > - How much data on disk? > 185G > - 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) > Bloom_filter_fp_chance 0.01 > chunk_length_in_kb 64 and LZ4 compressor And we have setting file_cache_size_in_mb to 1GB And we have swap configured to zero > > 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 >> >
