Success story of migrating an ongoing J2EE project from Microsoft VSS to IBM Rational ClearCase

Transcription

1 IBM Rational Software Development Conference 2006 Success story of migrating an ongoing J2EE project from Microsoft VSS to IBM Rational ClearCase Dilip K Varma Astra Infotech (P) Ltd dilip@astrainfotech.com 2006 IBM Corporation

2 Agenda SCM Recap aires the project Challenges The Solution Benefits Lessons Learned Acknowledgement References Demo Q&A

3 SDLC Activities Business Modeling & Requirement Management Analysis, Design & Implementation Testing & Deployment Project & Process Management Configuration & Change Management

4 Software Configuration Management Version Control Workspace Management Parallel Development Configuration Audit Build Management Process Control

5 Known Challenges Naming, Tracing & Retrieval of right versions Concurrent development support Geographically distributed development scenario Ongoing development support for addition, deletion & rollback Productivity enhancement through automation in build, release etc.

6 Configuration Management vs. Version Control Configuration Management: [ISO95] A supporting process whose purpose is to identify, define, and baseline items; control modifications and releases of these items; report and record status of the items and modification requests; ensure completeness, consistency and correctness of the items; and control storage, handling and delivery of the items Version: A variant of some artifact; later versions of an artifact typically expand on earlier versions Version Control Only a part of Configuration Management Identifying and tracing only versions No focus on process

7 Current automation scenario & challenges Version control automation No effective automation strategy for parallel development Missing effective linkage between Change Management & Configuration Management Less focus on build automation Change propagation automation

8 IBS the organisation A leading IT solutions provider to the global Travel, Transportation and Logistics (TTL) industry A CMMI Level 5 product development company One of the major, growing software development organisations in Kerala employees Development centers at Trivandrum & Cochin

9 aires the project Comprehensive passenger reservations, inventory control, fares & ticketing and departure control system for commercial airlines 5+ years of development effort 150+ developers J2EE, Weblogic, Oracle Current Customers Virgin Blue West Jet Virgin America

10 Project challenges Huge size of the development team Large volume of code base High frequency of build Ever changing market demands & expectations Synchronising geographically distributed development & on-site customization Product development at a crucial juncture Short transition time

11 CM challenges perceived Parallel development for enhancements, new features and fixes Addressing simultaneous product customization & support for multiple customers Geographically distributed development support Build and release automation Introducing change (in terms of process & tool) at a critical development juncture

12 CM root causes Redundant data Huge manual effort to release files for build Manual process leading to erroneous selection of files/versions Inability to address parallel development Improper integration workspace management

13 The solution Unified Change Management (UCM) for Activity based Configuration Management ClearCase, the automation tool Configuration Management than Version Control alone Effective parallel development Seamless synchronization with Change Management Effective build & release automation ClearCase MultiSite for distributed development On site services Training & Handholding Consulting Mentoring

14 UCM approach Out-of-the-box process solution Activity based approach Artifacts are grouped and baselined as components No config specs More branches of development Makes workspace management easier

15 Practical implementation risk Project at a very crucial juncture Changing the Configuration Management tool without affecting development Transferring live data & synchronisation New process & tool learning curve Natural human resistance for change

16 Implementation Inception Elaboration Construction Transition

17 Inception Demonstration of the tool & process Rational Unified Process (RUP) ClearCase UCM ClearCase MultiSite Key stakeholder concurrence Top Management & End customer commitment Pilot module identification Internal Champion identification & briefing Initial Configuration Item (CI) identification CM Process tailoring Baseline, branching, access control etc

18 Elaboration Pilot project data transfer from current module Imported identified module data to ClearCase with history Identified the module with maximum number of artifacts and versions as the candidate Setup ClearCase server and VSS client on a desktop machine Migrated the identified module s source code to ClearCase The migrated data included different versions of each artifact and the labels attached to them

19 Elaboration (cont.) Initial End user training Development team consisted of 7 groups Quick start sessions were given to them on UCM Preparation for parallel running Scripts were prepared and tested simulating a parallel run

20 Construction Training for entire project team Administrative Training End user training Setting up the environment Setup ClearCase servers VOB, License & Registry server on the same machine Setup release hosts Setup ClearCase clients ClearCase-ANT integration

21 Construction (cont.) Migrating the entire project Imported data from VSS to ClearCase Created a VOB for importing data from VSS A VSS client was setup on the same machine Created a user in VSS db without password Set the SSUSER environment variable to the newly created user Set PATH to the folder containing SS.EXE Set the VSS database using the SSDIR environment variable Set to the project using SS CP command Run the clearexport_ssafe r -o <path to datafile> utility to prepare the data file used for the actual import operation

22 Construction (cont.) Sample batch file SET PATH=%PATH%;C:\Program Files\Microsoft Visual Studio\Common\VSS\win32; SET SSDIR=C:\vssdb\iResDB SET SSUSER=migration SS CP $/ires/source clearexport_ssafe -r -o c:\import\cvt_data

23 Construction (cont.) Migrating the entire project (cont.) Re-organized the folder structure Identified components with the help of product architect Moved component folders to the root of the VOB Created symbolic links to retain the folder structure Created UCM components Created UCM PVOB Imported root level folders as UCM Components Imported labels as component baselines Setup UCM projects, streams, and workspaces

24 Construction (cont.) Sample batch file Z: CD \irescomp\java\src\com\ibsplc\ires cleartool co -nc. cleartool co -nc \irescomp cleartool mv M1 \irescomp cleartool mv M2 \irescomp cleartool mv Mn \irescomp

25 Construction (cont.) Sample batch file (cont.) CD \irescomp cleartool mv Java OldJava md Java\src\com\ibsplc\iRes cleartool mkelem -nc -eltype directory -ci -mkpath Java\src\com\ibsplc\iRes CD \irescomp\java\src\com\ibsplc\ires cleartool co -nc. cleartool ln -slink..\..\..\..\..\module1. cleartool ln -slink..\..\..\..\..\module2. cleartool ln -slink..\..\..\..\..\module3. cleartool ci -nc.

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27 Construction (cont.) Parallel run Phase I A script was run to update ClearCase data clearfsimport -recurse C:\import\Archive\%1\Java\src\com\ibsplc\iRes\Module1\* Y:\iResComp\Module1 Phase II Developers check-out/check-in to both VSS & ClearCase Roll out and streamlining CM process Introduction of MultiSite Demo & quick start training on ClearCase MultiSite Setting up ClearCase MultiSite VOB replication & synchronisation

28 Transition Completion of end user training Comprehensive training on ClearCase Administration, Unified Change Management, ClearCase Multisite Train the trainer program Preparation of custom training slides On site / offsite mentoring Periodical CM audits Periodical on site technological sessions Continuous telephonic/ support

29 Major benefits for IBS Automated build process Delivery from development stream to integration stream An attribute AutoDeliver(True) is attached to each activity Value of AutoDeliver decides whether that activity should be delivered or not Integration workspace updation Build (Reused existing ANT scripts) Baseline creation & recommendation Rebasing development streams Patch creation by comparing current & previous baseline

30 Major benefits for IBS (cont.) Effective parallel development Effective change propagation from one stream to another Traceability between change request & change set Support for distributed development

31 Lessons learned Migrating data from VSS Issues faced Parallel run Reference to a non existing VSS project Resolved by moving the project to a new VSS db A few file versions were not properly retrieved Manually retrieved Two phase parallel run, instead of an abrupt switch over, was very useful

32 Lessons learned (cont.) UCM vs. base ClearCase Proven Out-of-the-box process No config spec, Ideal for new adaptors Branching is easy Importance of Management commitment Awareness of future CM requirements and limitations of VSS Developer s resistance (delivery pressure, learning curve etc) Co-operation extended by developers

33 Acknowledgements IBM IBS Ms. Ameeta Roy (Technical Lead) Mr. Kishore P Vadapally (Advisory IT Specialist) Mr. Sunil Kinger (Country Manager) Mr. Jayan P. (General Manager Production Services) Mr. Viswanath (Configuration Manager) Mr. Don K. Varkey (Configuration Controller)

34 References Guide to developing software with UCM Guide to managing software projects ClearCase Administrator s guide ClearCase discussion forum RSDC 2005 presentations SCMA41: Solving UCM change flow mysteries SCMA47: Best Practices for J2EE development for teams using ClearCase UCM Rational Unified Process

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37 Dilip K Varma dilip@astrainfotech.com Jayan P jayan@ibsplc.com