O/S buffer cache,
because to write to disk you pass through buffer cache first.
From: Aaron Ploetz
Reply-To: "user@cassandra.apache.org"
Date: Tuesday, June 2, 2020 at 9:38 AM
To: "user@cassandra.apache.org"
Subject: Re: Cassandra crashes when using offheap_objects for
memt
primary key ((partition_key, clustering_key))
Also, this primary key definition does not define a partitioning key and a
clustering key. It defines a *composite* partition key.
If you want it to instantiate both a partition and clustering key, get rid
of one set of parens.
primary key (partitio
I would try running it with memtable_offheap_space_in_mb at the default for
sure, but definitely lower than 8GB. With 32GB of RAM, you're already
allocating half of that for your heap, and then halving the remainder for
off heap memtables. What's left may not be enough for the OS, etc. Giving
so
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 .
