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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2011/02/26 08:23:21 UTC

[jira] Commented: (CASSANDRA-2252) off-heap memtables

    [ https://issues.apache.org/jira/browse/CASSANDRA-2252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999734#comment-12999734 ] 

Jonathan Ellis commented on CASSANDRA-2252:
-------------------------------------------

Patches to add MemtableAllocator (based on Todd's MemStoreLAB) and off-heap allocation via FreeableMemory.

I gave up on trying to do the allocation for this and interning during deserialize; the code got very tangled and felt fragile.  Instead, we copy during Memtable.put, which feels right since there is no way to screw ourselves by forgetting to copy in a new code path.  I think I'm willing to bite the extra copy for that.

> off-heap memtables
> ------------------
>
>                 Key: CASSANDRA-2252
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2252
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>             Fix For: 0.8
>
>         Attachments: 0001-wip.txt, 0002-add-off-heap-MemtableAllocator-support.txt
>
>
> The memtable design practically actively fights Java's GC design.  Todd Lipcon gave a good explanation over on HBASE-3455.

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