hbase-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-11351) Experiments with OffHeap memstores
Date Fri, 13 Jun 2014 22:30:02 GMT
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.

This message was sent by Atlassian JIRA

View raw message