[jira] [Created] (CASSANDRA-12029) Use off-heap memtables by default

["Robert Stupp (JIRA)" <ji...@apache.org>]

Robert Stupp created CASSANDRA-12029:
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             Summary: Use off-heap memtables by default
                 Key: CASSANDRA-12029
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12029
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Robert Stupp
            Priority: Minor


A memtable configuration for 0mb on-heap and >0 mb off-heap is currently rejected.

I'm not fully sure whether this is intentional, but making the memtable completely off-heap could reduce heap usage and GC pressure using a configuration like this:
{code}
memtable_heap_space_in_mb: 0
memtable_offheap_space_in_mb: 1024
memtable_allocation_type: offheap_objects
{code}




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