Mailing-List: contact common-dev-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
Reply-To: common-dev@hadoop.apache.org
Date: Mon, 15 Apr 2013 18:44:16 +0000 (UTC)
From: "Steve Loughran (JIRA)" <jira@apache.org>
To: common-dev@hadoop.apache.org
Message-ID: <JIRA.12600538.1343435418294.168946.1366051456130@arcas>
In-Reply-To: <JIRA.12600538.1343435418294@arcas>
References: <JIRA.12600538.1343435418294@arcas>
Subject: [jira] [Resolved] (HADOOP-8630) rename isSingleSwitch() methods in
 new topo base class to isFlatTopology()
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


     [ https://issues.apache.org/jira/browse/HADOOP-8630?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Loughran resolved HADOOP-8630.
------------------------------------

    Resolution: Won't Fix
      Assignee: Tsuyoshi OZAWA

Marking as wontfix but crediting Tsuyoshi Ozawa for his contribution
                
> rename isSingleSwitch() methods in new topo base class to isFlatTopology()
> --------------------------------------------------------------------------
>
>                 Key: HADOOP-8630
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8630
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: util
>    Affects Versions: 2.0.0-alpha, 3.0.0
>            Reporter: Steve Loughran
>            Assignee: Tsuyoshi OZAWA
>            Priority: Trivial
>         Attachments: HADOOP-8630.2.patch, HADOOP-8630.patch
>
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
>
> The new topology logic that is not yet turned on in HDFS uses the method {{isSingleSwitch()}} for implementations to declare whether or not they are single switch. 
> The use of "switch" is an implementation issue; the big VM-based patch shows that really it's about "flat" vs "hierarchical", with Hadoop assuming that subtrees in the hierarchy have better bandwidth (good) but correlated failures (bad). 
> Renaming the method now -before it's fixed and used- is time time to do it. 

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira