I just changed these properties to increase flushed file size (decrease number of compactions):
memtable_allocation_type from heap_buffers to offheap_objects memtable_offheap_space_in_mb: from default (2048) to 8192 Using default value for other memtable/compaction/commitlog configurations . After a few hours some of nodes stopped to do any mutations (dropped mutaion increased) and also pending flushes increased, they were just up and running and there was only a single CPU core with 100% usage(other cores was 0%). other nodes on the cluster determines the node as DN. Could not access 7199 and also could not create thread dump even with jstack -F. Restarting Cassandra service fixes the problem but after a while some other node would be DN. Am i missing some configurations? What should i change in cassandra default configuration to maximize write throughput in single node/cluster in write-heavy scenario for the data model: Data mode is a single table: create table test( text partition_key, text clustering_key, set<text> rows, primary key ((partition_key, clustering_key)) vCPU: 12 Memory: 32GB Node data size: 2TB Apache cassandra 3.11.2 JVM heap size: 16GB, CMS, 1GB newgen Sent using https://www.zoho.com/mail/
