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From "Hadoop QA (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 Fri, 16 Nov 2007 18:55:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12543162
] 

Hadoop QA commented on HADOOP-1989:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
http://issues.apache.org/jira/secure/attachment/12369558/SimulatedStoragePatchSubmit8.txt
against trunk revision r595406.

    @author +1.  The patch does not contain any @author tags.

    javadoc +1.  The javadoc tool did not generate any warning messages.

    javac +1.  The applied patch does not generate any new compiler warnings.

    findbugs +1.  The patch does not introduce any new Findbugs warnings.

    core tests +1.  The patch passed core unit tests.

    contrib tests +1.  The patch passed contrib unit tests.

Test results: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1104/testReport/
Findbugs warnings: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1104/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1104/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1104/console

This message is automatically generated.

> 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
>    Affects Versions: 0.16.0
>            Reporter: Sanjay Radia
>            Assignee: Sanjay Radia
>            Priority: Minor
>             Fix For: 0.16.0
>
>         Attachments: SimulatedStoragePatchSubmit.txt, SimulatedStoragePatchSubmit5.txt,
SimulatedStoragePatchSubmit6.txt, SimulatedStoragePatchSubmit7.txt, SimulatedStoragePatchSubmit8.txt
>
>
> 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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