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