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From "Stu Hood (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1989) Add support for simulated Data Nodes - helpful for testing and performance benchmarking of the Name Node without having a large cluster
Date Wed, 03 Oct 2007 19:52:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12532226
] 

Stu Hood commented on HADOOP-1989:
----------------------------------

I can't believe this hasn't already been implemented! Very good idea sir.

Perhaps each Simulated Data Node should be a pool of dummy nodes that grabs a few ports and
contacts and replies to the Namenode with a thread pool.

> Add support for simulated Data Nodes  - helpful for testing and performance benchmarking
of the Name Node without having a large cluster
> ----------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-1989
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1989
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Sanjay Radia
>            Priority: Minor
>
> Proposal is to add an implementation for a Simulated Data Node.
> This will 
>   - allow one to test certain parts of the system (especially the Name Node, protocols)
much more easily and efficiently.
>   - allow one to run performance benchmarks on the Name node without having a large cluster.
>   - Inject faults for testing (e.g. one can add random faults based probability parameters).
> The idea is that the Simulated Data Node will
>  - discard any data written to blocks (but remember the blocks and their sizes)
>  - generate fixed data on the fly when blocks are read (e.g. block is fixed set of bytes
or repeated sequence of strings).
> The Simulated Data Node can also be used for fault injection.
> The data node can be parameterized with probabilities that allow one to control:
>   - Delays on reads and writes, creates, etc
>   - IO Exceptions
>  - Loss of blocks 
>  - Failures

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