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https://issues.apache.org/jira/browse/CASSANDRA-2701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13038940#comment-13038940
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Chris Goffinet edited comment on CASSANDRA-2701 at 5/25/11 2:52 AM:
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At the moment, off-heap does not support LRU. We get that from memcached, we
use it as write-through LRU cache. We also internally have special version of
memcached that has better visibility statistics than current memcached does
along with much better improvements that we plan to open source. We also like
the fact we don't have to worry about specifying N of objects, and instead use
MB. Right now, we see more overhead in Cassandra as a whole, before even
worrying about the performance of connecting over localhost. We have room for
improvement there before off-heap becomes attractive. We look at this as
short-term solution, until off-heap supports LRU, provides better statistics,
and is much more than just malloc/free.
was (Author: lenn0x):
At the moment, off-heap does not support LRU. We get that from memcached,
we use it as write-through LRU cache. We also internally have special version
of memcached that has better visibility statistics than current memcached does
along with much better improvements that we plan to open source. We also like
the fact we don't have to worry about specifying N of objects, and instead use
MB. Right now, we see more overhead in Cassandra as a whole, before even
worrying about the performance of connecting over localhost. We have some big
room for improvement there before off-heap becomes attractive. We look at this
as short-term solution, until off-heap supports LRU, and is much more than just
malloc/free.
> Memcache Row Cache Provider
> ---------------------------
>
> Key: CASSANDRA-2701
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2701
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Chris Goffinet
> Assignee: Chris Goffinet
> Priority: Trivial
>
> Create a row cache provider that uses memcached. We would like to contribute
> our provider we wrote that we use in production. We co-locate memcached on
> every node, and utilize Cassandra's ability to do replication + routing.
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