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Posted to issues@hbase.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2014/06/14 00:30:02 UTC

[jira] [Created] (HBASE-11351) Experiments with OffHeap memstores

Lars Hofhansl created HBASE-11351:
-------------------------------------

             Summary: 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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