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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5603) Improve block placement performance
Date Mon, 06 Apr 2009 20:53:13 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5603?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hairong Kuang updated HADOOP-5603:
----------------------------------

    Attachment: blockPlace1.patch

This patch fixed a bug that caused some unit tests to fail.

> Improve block placement performance
> -----------------------------------
>
>                 Key: HADOOP-5603
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5603
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.21.0
>
>         Attachments: blockPlace.patch, blockPlace1.patch
>
>
> ReplicationTargetChooser chooses targets by iteratively selecting random nodes first
and then filtering good targets until the required number of targets are chosen. This code
may require selecting random nodes multiple times, thus introducing multiple traversals of
the given portion of the cluster map.  This code can be improved by traversing the portion
of the cluster map only once.

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