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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11351) Experiments with OffHeap memstores
Date Sun, 15 Jun 2014 03:58:02 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11351?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Lars Hofhansl updated HBASE-11351:

    Attachment: 11143-0.94-v3.txt

Very slightly better. Stores only the key portion of the KV in the off heap map's key.

> Experiments with OffHeap memstores
> ----------------------------------
>                 Key: HBASE-11351
>                 URL: https://issues.apache.org/jira/browse/HBASE-11351
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>         Attachments: 11143-0.94-v3.txt, 11351-0.94-v2.txt, 11351-0.94.txt
> 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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