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From "Mikhail Antonov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11351) Experiments with OffHeap memstores
Date Fri, 13 Jun 2014 22:54:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14031298#comment-14031298

Mikhail Antonov commented on HBASE-11351:

bq.  I hooked this up in an experimental way
is there supposed to be a patch posted here?

> 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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