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https://issues.apache.org/jira/browse/CASSANDRA-9472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14631112#comment-14631112
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Sylvain Lebresne commented on CASSANDRA-9472:
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I'll note that unless I'm forgetting something, re-introducing this is not
terribly complex (especially post-CASSANDRA-9705). CASSANDRA-8099 hasn't
touched the off-heap memtable machinery much, so I think all we need is to
implement the {{NativeAllocator.rowBuilder}} method (referencing CASSANDRA-9705
patch here). Which in turns mainly mean writting a {{NativeRow}} implementation
that is the counterpart of our previous {{NativeCell}} implementations (and we
can likely salvage some of the code of said {{NativeCell}}). This thus require
to come up with a reasonable serialization format for offheap rows, but that's
hardly rocket science.
Note that I'm just talking here of doing what this ticket is actually about,
which is to re-introduce off-heap memtables in a way that is as close as
possible from what we had pre-CASSANDRA-8099. And I don't think we should wait
on Java 9 or anything to do that. Of course we will improve on all this in the
future, but let's please leave that to some future ticket.
> Reintroduce off heap memtables
> ------------------------------
>
> Key: CASSANDRA-9472
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9472
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Benedict
> Fix For: 3.x
>
>
> CASSANDRA-8099 removes off heap memtables. We should reintroduce them ASAP.
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