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From "Jay Patel (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7882) Memtable slab allocation should scale logarithmically to improve occupancy rate
Date Tue, 09 Dec 2014 19:08:12 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14239871#comment-14239871
] 

Jay Patel commented on CASSANDRA-7882:
--------------------------------------

Ah, CASSANDRA-7883 is for 3.0. Can we have it merge to 2.1.3?

> Memtable slab allocation should scale logarithmically to improve occupancy rate
> -------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-7882
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7882
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jay Patel
>            Assignee: Benedict
>              Labels: performance
>             Fix For: 2.1.3
>
>         Attachments: trunk-7882.txt
>
>
> CASSANDRA-5935 allows option to disable region-based allocation for on-heap memtables
but there is no option to disable it for off-heap memtables (memtable_allocation_type: offheap_objects).

> Disabling region-based allocation will allow us to pack more tables in the schema since
minimum of 1MB region won't be allocated per table. Downside can be more fragmentation which
should be controllable by using better allocator like JEMalloc.
> How about below option in yaml?:
> memtable_allocation_type: unslabbed_offheap_objects
> Thanks.



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