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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (HADOOP-5595) NameNode does not need to run a replicator to choose a random DataNode
Date Thu, 02 Apr 2009 22:17:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12695150#action_12695150
] 

Hairong Kuang edited comment on HADOOP-5595 at 4/2/09 3:15 PM:
---------------------------------------------------------------

Failed tasks were not related to this change. The change is too trivial to have a unit test.

I've committed this.

      was (Author: hairong):
    Failed tasks were not related to this change. The change is too trivial to have a unit
test.
  
> NameNode does not need to run a replicator to choose a random DataNode
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-5595
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5595
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.21.0
>
>         Attachments: randomDataNode.patch
>
>
> FSNamesystem#getRandomDatanode uses a replicator to choose a random DataNode. It's an
overkill. Instead, Topology#chooseRandom is a much light-weight way to choose a random DataNode
from a cluster map.

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