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From "C. Scott Andreas (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-12029) Use off-heap memtables by default
Date Mon, 19 Nov 2018 02:25:00 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-12029?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

C. Scott Andreas updated CASSANDRA-12029:
-----------------------------------------
    Component/s: Configuration

> Use off-heap memtables by default
> ---------------------------------
>
>                 Key: CASSANDRA-12029
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12029
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Configuration
>            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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