How to assign more memory for the flush queue between memtable and sstable in Cassandra. I have getting timeout errors and the heap and young region usage seems to within limits. There is no other processing happening except Cassandra in the machine. Also how to find if any requests are dropped at the ethernet card and not by Cassandra. I use Cassandra Datastax 4.7 and Java 1.8.
How to change the flush queue size of cassandra
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You can increase the number of flush writers by editing
memtable_flush_writersin yourcassandra.yamlfile. See the related docs.You don't assign memory to a queue. You can only increase the threads for the queue. You can increase the memory for the JVM in it's entirety. Heap size for Cassandra is usually recommended to be 8GB though some will go higher with specific JVM tuning.
If you're interested on network packets dropped specifically take a look at the output of:
ifconfigkeeps counts of packets that have errored out, been dropped, etc. at the NIC level.