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Posted to commits@cassandra.apache.org by "Benedict (JIRA)" <ji...@apache.org> on 2014/09/05 11:16:28 UTC

[jira] [Assigned] (CASSANDRA-7882) Allow disabling slab allocation for off-heap memtables

     [ https://issues.apache.org/jira/browse/CASSANDRA-7882?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benedict reassigned CASSANDRA-7882:
-----------------------------------

    Assignee: Benedict

> Allow disabling slab allocation for off-heap memtables
> ------------------------------------------------------
>
>                 Key: CASSANDRA-7882
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7882
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jay Patel
>            Assignee: Benedict
>             Fix For: 2.1.1
>
>
> 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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