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https://issues.apache.org/jira/browse/CASSANDRA-2252?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stu Hood updated CASSANDRA-2252:
--------------------------------
Attachment: merged-2252.tgz
Attaching a merged version of the two patches, as described earlier.
I also went ahead and slabbed the IndexSummaries, and added naive slabbing to
the keycache: we'll need a longer term solution for slabbing caches, because of
the overhead of internal fragmentation.
The alternate patch has had a lot of burn in time on our clusters: combined
with slabbing the IndexSummaries and disabling the keycache, we saw our first
oldgen compaction after 76 hours, with an average of over a week before
compaction.
> 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-add-MemtableAllocator.txt,
> 0002-add-off-heap-MemtableAllocator-support.txt, 2252-alternate-v2.tgz,
> merged-2252.tgz
>
> Original Estimate: 0.4h
> Remaining Estimate: 0.4h
>
> The memtable design practically actively fights Java's GC design. Todd
> Lipcon gave a good explanation over on HBASE-3455.
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