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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3022) Fast Cluster Restart
Date Fri, 09 May 2008 20:57:55 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12595718#action_12595718

Konstantin Shvachko commented on HADOOP-3022:

Note. I updated the numbers in the tables above. Due to a calculation error the number for
load edits was too high.

> How do you measure only processing time? 
Yes I modified code and add logging lines printing processing times. It is in the patches
linked to this issue.
For measuring block report processing I use modified NNThroughputBenchmark. 
Therefore, it is an estimate not the real cluster processing time, but it is sort of an upper
bound for how fast the name-node can process those reports.

> Fast Cluster Restart
> --------------------
>                 Key: HADOOP-3022
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3022
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs
>            Reporter: Robert Chansler
>            Assignee: Konstantin Shvachko
>             Fix For: 0.18.0
> This item introduces a discussion of how to reduce the time necessary to start a large
cluster from tens of minutes to a handful of minutes.

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