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From Brad Sarsfield <b...@bing.com>
Subject RE: how to write hadoop client to test HDFS with fault injection
Date Tue, 29 Nov 2011 16:36:57 GMT
Hi Hao,

You may want to setup a full Hadoop 'one box' install and start running the TestDFSIO, Teragen
and Terasort (with a small amount of data) scenarios using the injected jar to run hdfs. 
That may be the fastest and best way to get up and running.

When it comes to fault injection the valuable issues that you find may be found using the
end to end tests versus targeted api calls.  It's much more realistic. It's a much stronger
case to get something fixed / fix something when you can point to the end to end scenario,
showing how it can fail.   That's where you find the good ones.

You may also want to consider what a data validation oracle would look like that would allow
you to do data validation to catch data corruption issues. If you do go further and create
a scenario that, say generates a non-random / repeatable sequence that reads/writes to HDFS,
you could use the fault injection and the oracle would validate data correctness. 

You'd get extra bonus points if you packaged things up and contributed your work to Bigtop
so others could benefit long term.

~Brad

-----Original Message-----
From: Hao Yang [mailto:hao.yang0614@gmail.com] 
Sent: Monday, November 28, 2011 9:44 PM
To: common-dev@hadoop.apache.org
Subject: how to write hadoop client to test HDFS with fault injection

Hi, all:

I am a graduate student, now working on HDFS fault injection course project. I used FI framework
to create aspects, and hdfs-fi.jar was generated. How can I write Hadoop Client code to test
the injection? Thank you.


Thank you very much for your time.


Best regards
Hao Yang


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