Rdiff and Rsync Implementation on Moodle's Backup and Restore Feature of Course Synchronization over...

Rdiff and Rsync Implementation on Moodle’s Backupand Restore Feature for Course Synchronization over

The Network

Fajar Purnama 1 Tsuyoshi Usagawa 1 Royyana Ijtihadie 2 Linawati 3

1Kumamoto University

2Institut Teknologi Sepuluh Nopember

3Udayana University

[email protected] [email protected] [email protected] [email protected]

October 18, 2016

Fajar Purnama (KU) TENSYMP2016 October 18, 2016 1 / 38

Outline

1 IntroductionE-learningOnline CourseLMS MoodleDeveloping a Course

2 Related WorkCourse SharingIssue of Traditional CourseSharingCourse Synchronization

3 ExperimentProposed CourseSynchronizationScenarios

4 ResultDemonstrationMeasurement

5 Conclusion and Future Work


Introduction E-learning

Electronic Learning

The use of electronic devices in the learning and teaching process.


Introduction Online Course

Classroom: Conventional vs Online

Anywhere

Anytime

Face to Face

Face to Face

AnytimeAnywhere

Face to FaceAnywhereAnytime


Introduction LMS Moodle

Learning Management System

Learning Management System (LMS) can be refered to a software with asystem that can manage online learning and teaching process.



On the students’ side they can read materials



On the students’ side they can follow quizzes



On the students’ side they can join discussions



On the students’ side they can submit assignments


Introduction Developing a Course

On The Teacher’s Side

Flexibility

Teachers can return feedbacks at their leasure time. Withall the student’s activity recorded on the system, it iseasier to monitor

IssueIt is not so easy developing a course. Some contents maycorrectly be written by Professors. Through experience can a persondevelop a well designed and written course, but also takes time to gainthose experiences, not to mention developing a course afterwards.


Related Work Course Sharing

Course sharing as one of the solutions.

The term massive open online course (MOOC) was one of the triggers where course areopen for countless participants to enroll online. Then came an idea, why not share thesecourses? It’s one of the solutions to the issue of developing a course by oneself.


Related Work Course Sharing

Moodle’s Course Backup and Restore Feature

Moodle had a feature to reuse course on other sites.

The course can be backup into .mbz format archive and that is whatis downloaded on the course sharing on moodle.net.

The major features Moodle’s backup and restore are the flexibility toset the informations contain on the backup whether they are includingusers information or not, or including all contents or just certaincontents.


Related Work Issue of Traditional Course Sharing

Constant revisions for perfecting a course, especially informal education systems.

FLOW

OF

TIME

Authors Subscribers

CreatesCourse

16MBCourse

16MB

Share

RevisesCourse

28MBCourse

28MB

Share

RevisesCourse

30MBCourse

30MB

Share

RevisesCourse

...MBCourse

Share

HeavyNetwork


Related Work Course Synchronization

Identify the differences between databases and directories,then send the differences and update current course.

FLOW

OF

TIME

Authors Subscribers

CreatesCourse

16MBCourse

16MB

Share

RevisesCourse

28MBCourse

~10MB

Update

RevisesCourse

30MBCourse

~2MB

RevisesCourse

...MBCourse

Update

16MBCourse

28MBCourse

Update

...MBCourse

EfficientNetwork



Application Written in PHP

Master Console

Slave Console

Before Synchronization After Synchronization



Challenges of Course Synchronization

CompatibilityDeveloping many applications to be compatible with allversions of Moodle.

FlexibilityDevelop features to set the synchronized informations.

These FeaturesMoodle’s course backup and restore has these features.


Experiment Proposed Course Synchronization

Moodle’s Backup and Restore Feature + FileSynchronization


Experiment Proposed Course Synchronization

Implements rdiff: controlled rsync algorithm application


Experiment Scenarios

Our Course: Section 1



Scenario 1: Without Synchronization



Scenario 2: Large Content Synchronization

Slave LMS

Master LMS



Scenario 3: Medium Content Synchronization

Slave LMS

Master LMS



Scenario 4: Small Content Synchronization

Slave LMS

Master LMS



Scenario 5: Small Modification Synchronization

Slave LMS

Master LMS



Scenario 6: Change Order

Slave LMS Master LMS



Scenario 7: No Change



Result Demonstration

Console Written in PHP, both sides uploads their backuparchive.




On the slave side, ”settings” to define the Master’s Url,then ”update”.




Slave side generates signature file.




Slave side sends signature file and Master side receives.




Master side generates delta file using its backup file andreceived signature file.




Master side returns delta file to Slave side.




Master side updates the backup archive using the receiveddelta file.



Result Measurement

Network Usage of Synchronization

Rdiff direct archive synchronization. Rdiffdir recursive file synchronization.


Conclusion and Future Work

Efficiency

Like the previous course synchronization, this paper’scourse synchronization method also shows networkefficiency.

Compatibility

Since it uses the existing feature in Moodle, it is likelycompatible with all versions of Moodle, but it has not yet fullydemonstrated on this paper. In the future it will be demostrated and also furtherdevelop the application to be compatible with all other LMSs.

Flexibility

Unlike our previous course synchronization, the one on this paper gave moreflexibility to specify the informations to be synchronizedsince it uses Moodle’s backup and restore feature. However this too hasn’t been fullydemonstrated.


Conclusion and Future Work

Thank youAny comments or questions?


Rdiff and Rsync Implementation on Moodle's Backup and Restore Feature of Course Synchronization over...

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