Predicting Bug Fixing Efforts for Open-source Software SystemsPrashant Raghav, Jenny WangCS 846

OUTLINE

1.Problem and Our Solution2.Initial Setup 3.COS4.Effort Estimation 5.References

Traditional Approach

LOC/Avg LOC ph by a developer = Total number of developer hours● Doesn’t account for

○ Project complexity○ Developer Proficiency

Our Tool ...

Tell me who the bug is Assigned to I will tell you How much time it gonna take ?

1.Selecting Dataset

Choices : BugZilla, JBoss project, Linux

Apache Hadoop Common Issue Tracking System.

Issues 30 Day Summary

Hadoop Common is the common library for Apache Hadoop

Issues 30 Day Summary.Issues: 114 created 66 resolved

2.Data Extraction

Download Data Extract Developers Bug Fix Activity

ID, Title, Description, Status, Detail, Developer

3. Database

Store each Defect in DB with defect information.

3.New Defect

Compare with Previous Defects.

● Duplicate Defect● New Feature

Bug : Incomplete Closing of FirefoxHadoop : Bug-12435Unable to run Hadoop (2.2.0) commands on Cygwin (2.831) on Windows XP 3

Bug-239223 (Ghostproc) – Hadoop version 2.2.0 command while running on Windows XP3 using Cygwin(2.831)

Bug : Incomplete Closing of FirefoxHadoop : Bug-12435Unable to execute Hadoop (2.2.0) commands on Cygwin (2.831) running on Windows XP SP3

Bug-239223 (Ghostproc) – Hadoop version 2.2.0 command could not run on Windows XP (service pack 3) using Cygwin(2.831)

More Bugs

Bug-244372: "Document contains no data" message on continuation page of NY Times article

Bug-219232: random "The Documentcontains no data." Alerts

4.Coefficient of Similarity

CoS : Depends on various factors.a) Are the code files similar?b) Input Files Similar ?c) Fraction of common keywords ?d) Which component ?

5.COS

More the similarity Higher the CoS. Exact Duplicate Defect CoS =1 CoS = w1*TS + w2*FS + w3*CS + w4*IFS* TS : Bug Report Similarity FS : Source Files Similarity SC : Component Similarity IS : Input Files Similarity where Wi are weight to be determined by experiments.

6. Programmer Proficiency

4 Buckets : ● Beginner ● Intermediate● Seasoned● Expert

7.Bracket Determination

Bracket Adjustment Factor(BAF)

● Commits to Software(Features)● 6 months time Frame.

○ No of Defects Solved○ No of Defects Reopened

8.Priority of Bug

Priority Adjustment Factor● High● Medium● Low

9.Comparing CoS for all defects

Each New Defect Compared against all defects defined in the database. Those with Highest CoS are extracted .

10. Effort Estimate

COS > threshold

ES -> ∑ CoSi * DTi / nWhere n - > No Of Similar Defects DTi : Developer Time

Programmer ProficiencyPriority of Defect

If CoS = 1 : Duplicate Defect Discard

References

● https://issues.apache.org● http://menzies.us/pdf/11ase.pdf● Local vs. Global Models for Effort Estimation and Defect

Prediction , Tim Menzis , Andrian Marcus● Towards Improving Bug Tracking Systems with Game

Mechanisms ,Leonardo Pasos ,University of Waterloo