[
https://issues.apache.org/jira/browse/CASSANDRA-2252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999878#comment-12999878
]
Jonathan Ellis commented on CASSANDRA-2252:
-------------------------------------------
I'll look deeper later, but one quick comment:
bq. Original uses JNA for direct memory access, alternate uses
ByteBuffer.allocateDirect
allocateDirect pointers are not freed until CMS runs finalizers, so this could
result in much larger space used than intended.
The JNA-based code isn't perfect though either, I've seen heisenbug segfaults.
I'm sure it's fixable though.
> off-heap memtables
> ------------------
>
> Key: CASSANDRA-2252
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2252
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Fix For: 0.8
>
> Attachments: 0001-add-MemtableAllocator.txt,
> 0002-add-off-heap-MemtableAllocator-support.txt, 2252-alternate-v1.tgz
>
>
> The memtable design practically actively fights Java's GC design. Todd
> Lipcon gave a good explanation over on HBASE-3455.
--
This message is automatically generated by JIRA.
-
For more information on JIRA, see: http://www.atlassian.com/software/jira
