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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-15047) Try spin lock for MVCC completion
Date Tue, 29 Dec 2015 23:07:49 GMT

     [ https://issues.apache.org/jira/browse/HBASE-15047?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Elliott Clark updated HBASE-15047:
----------------------------------
    Attachment: HBASE-15047.patch

This will greatly change the way perf/flame graphs look. We will now be in user mode code
a lot more.

However that should result in much faster response times as there should be no scheduler overhead.

> 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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