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Posted to issues@hbase.apache.org by "Elliott Clark (JIRA)" <ji...@apache.org> on 2016/01/12 18:14:40 UTC
[jira] [Commented] (HBASE-15047) Try spin lock for MVCC completion
[ https://issues.apache.org/jira/browse/HBASE-15047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15094318#comment-15094318 ]
Elliott Clark commented on HBASE-15047:
---------------------------------------
I'm going to hold off on more testing for this until HBASE-15082 that should really make this shine.
> Try spin lock for MVCC completion
> ---------------------------------
>
> Key: HBASE-15047
> URL: https://issues.apache.org/jira/browse/HBASE-15047
> Project: HBase
> Issue Type: Bug
> Reporter: Elliott Clark
> Assignee: Elliott Clark
> Attachments: HBASE-15047.patch
>
>
> Waits/Notify is very very expensive since it can cost a thread scheduling. There should only ever be a few threads ( < Num Cores ) running. So it should be possible to spin and use compare and swap to update the read point.
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