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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3992) Synthetic Load Generator for NameNode testing
Date Wed, 03 Sep 2008 19:51:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12628114#action_12628114
] 

Tsz Wo (Nicholas), SZE commented on HADOOP-3992:
------------------------------------------------

Below are more review comments:
- Change comments to javadoc.
- Print generic options in usage

StructureGenerator.java
- r.nextInt(maxWidth-minWidth) should be r.nextInt(maxWidth-minWidth+1).
- Should we use IllegalArgumentException, instead of NumberFormatException?

LoadGenerator.java
- "-seed" here may not be useful since the randomness depends on the execution order of the
threads.
- Check individual range for readPr, writePr, maxDelayBetweenOps
- In javadoc, we should mention that the unit of maxDelayBetweenOps is milliseconds.

> Synthetic Load Generator for NameNode testing
> ---------------------------------------------
>
>                 Key: HADOOP-3992
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3992
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs
>            Reporter: Robert Chansler
>            Assignee: Hairong Kuang
>             Fix For: 0.19.0
>
>         Attachments: loadGenerator.patch, LoadGeneratorUserGuide.pdf
>
>
> For performance and correctness testing. The goal is to faithfully simulate the load
of a 5000-node cluster with a (comparatively) tiny number of nodes. 

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