msr
TRANSCRIPT
Master on Free Software
MSR Challenge 2008
Israel Herraiz<[email protected]>
A Coruña, January 11th 2008
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The MSR challenge
● Mining challenge● Two challenges:
– Predict the number of bugs– Report about a selected project
● Using software repositories
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This year
● Target: Eclipse● Challenge #1: Report about Eclipse● Challenge #2: Prediction of number of
changes on February, March and April● Deadline: February 7th 2008
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The winner
● Challenge #1: IPod Nano● Challenge #2: IPod Touch● Last year Libresoft won challenge #2...● ...but they did not give us any IPod :'(
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What is available for Eclipse?
● Bugzilla database● Repository for mirroring● Some XML data linked from the challenge
webpage● Some scripts in Java to count bugs using
the XML data
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Let's see the data
● http://msr.uwaterloo.ca/msr2008/challenge/
● http://archive.eclipse.org/arch/
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An example of report
● The Bugzilla report form● It is more complicated than a tax
declaration form● Let's see a report
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Complexity, simplicity, severity
● Severity is used by developers to classify bugs
● Thus, the most severe bugs gain attention before the least severe
● The bug report form of Eclipse has 7 degrees of severity
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Degrees of severity
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Severity
● The 7 categories are confusing● Hard to say what is the difference among
two categories● Those who report bugs get confused and
probably do not use that form in the appropiate way
● There is an explanation for the degrees of severity...
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From Bugzilla Help
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Is there actually seven different group of bugs?
● Bugs with different severity should show a different time to fix
● Let's find out how many different groups are out there
● We will use the Bugzilla database, but only the bugs table
● http://tinyurl.com/2e48hm (description of the table)
● http://tinyurl.com/ynuav4 (the database)
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Steps
● Download the database● Extract and dump (dbname: msr08bugs)● Analyze using R