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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11351) Experiments with OffHeap memstores
Date Sat, 14 Jun 2014 01:02:37 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14031380#comment-14031380
] 

Lars Hofhansl commented on HBASE-11351:
---------------------------------------

Not yet :)
I have one, but it only work in 0.94 since serialization into bytes was easy then (just from
the writeable).

> Experiments with OffHeap memstores
> ----------------------------------
>
>                 Key: HBASE-11351
>                 URL: https://issues.apache.org/jira/browse/HBASE-11351
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>
> I have been experimenting with offheap memstores using an offheap BTree implementation
of ConcurrentMap provided by MapDB (www.mapdb.org)
> So far I hooked this up in an experimental way with inefficient serialization (in the
sense that due to our special usage of the set api we need to back the set by a map, which
in the off heap case means we need to serialize and store the value twice. It is used as key
and value). But it works.
> It's quite a bit slower and due to need to deserialize upon scan it produces *more* short
term garbage.
> Let's use this issue to discuss.



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