Sakai 2.1 Update

Charles Severance

December 7, 2005

Sakai Babies

• Rachel/Stanford (1.0 pre-alpha)• Quingru/Stanford (1.0),• Rashmi/Tanush/Foothill (1.5)• Mallika/Saahil/Foothill (1.5.1)• Joanne/UM (2.0)• Seth/Zoe/Columbia (2.0.1) • Rob Lowden/TBD/IU (2.1)• Anthony Whyte/TBD/Sakai (2.1.1)• John Ellis/TBD/rSmart (2.1.2)

Rob LowdenQuickTime™ and a

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Rob LowdenQuickTime™ and a

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Carol Dippel

We love you Carol,

Oh yes we do

We love you Carol,

And we’ll be true

If you don’t do QA,

We’re blue!

Oh Carol, we love you.

We thank you Carol,

Oh yes we do

We thank you Carol,

And we’ll be true

Your work on Sakai,

Has been cool!

Oh Carol, we thank you.

August 2005

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August 11, 2005

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August 12, 2005, 12:46 PMFrom: Charles Hedrick <hedrick@rutgers.edu>To: Bill Crosbie <bcrosbie@rci.rutgers.edu>Cc: Glenn Golden <ggolden@umich.edu>, ZE Joseph <hardin@umich.edu>, Charles Severance <csev@umich.edu>, Jon Andersen <janderse@umich.edu>, lance D Speelmon <lance@indiana.edu>, Andrew J Poland <ajpoland@iupui.edu>, John Leasia <jleasia@umich.edu>, Robert J Lowden <rlowden@iupui.edu>, David Haines <dlhaines@umich.edu>, "Bradley C. Wheeler" <bwheeler@indiana.edu>Date: Aug 12, 2005 12:46 PMSubject: Re: Urgent: Memory Leak in Sakai

I agree with Bill. Some comments.

1) I'll tell you what we're seeing, but it's possible not all sites areseeing the same thing.

2) Your first priority needs to be setting up monitoring, so you cansee what you are actually running out of. Our current theory is thatthe problem is in permanent space. This would never be visible fromnormal log files. The only way we see what's happening is because we'rerunning Sun's memory monitoring tools, particularly VisualGC.

3) My current theory is that our problem is with dynamically loadedclasses. When the system starts, we have about 10000 classes loaded,with permanent space taking about 34 MB. After 14 or so hours today, wehave 15490 class loads, and permanent memory use of 60.8 MB. Thedefault is 64 MB maximum, so we think it's likely that by the end ofthe day we will have exhausted the default permanent memory, unless aGC gets lots of space back. Yesterday it did not. It unloaded somethinglike a dozen classes and reclaimed very little memory.

I don't know what's causing the continuing loading of new classes. Idon't know whether that is intended or not, and if it's intended, whenthe classes are supposed to be released. I've now get the maximum inpermanent expanded to 128MB. That will let us see whether spaceeventually stabilizes, and if so at what level.

My theory is that this problem has been intermittent because usagequickly expands to 60 out of 64. That's so close to the limit thatdepending upon details of the load sometimes it goes over and sometimes it doesn't. Whether there's an actual bug (i.e. memory usage expands for ever) I don't feel I can tell yet. I think by sometime next weekthe pattern will be clear enough. In the short run, we will try to addenough permanent memory to avoid the problem. If memory use growsforever, we'll try to add enough that we can survive by doing a nightlyrestart.

Note on setting up VisualGC: Most of the tools come with Java 5.0.Visual GC itself is a separate download. You will need Java 5.0installed, because the tools require it, but it doesn't need to be (andat Rutgers, isn't) your default version of Java. Setting it up is quiteeasy. I've used VisualGC running locally (displaying remotely usingX11), and also the remote version (which needs a copy of jstatd runningon the server).

The commands for remote use are not entirely obvious from the man page, so here they are:

On the server:   ./jstatd -p 25209 -J-Djava.security.policy=<FILE>where 25209 is a random TCP port number and <FILE> is a file containinga Java policy (which is given in the man page)

On the client:  bin/visualgc rmi://26429@sakai2.rutgers.edu:25209where 26429 is the PID of the JVM on the server, and 25209 is therandom TCP port number

In this case the server is Solaris 9 SPARC and the client OS X Tiger,but that shouldn't matter. The visualgc shell script requiressignificant repair on OS X, though the program runs fine.

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Sakai 2.1 - Dates

• 2.0 - 06/15/2005

• 2.1 Integration Week - 10/24/2005

• 2.1.0_001 - 10/28/2005– Release Engineering and QA begins

• 2.1.0_004 - 11/17/2005– Maintenance branch established

• 2.1 Release - 12/01/05

Code Trends

Code Size over Sakai Release

0

20

40

60

80

100

120

1.0 1.5 1.5.1 2.0 2.1

Sakai Release

Megaytes

Provisional

JSF Tools

Samigo

Framework II

Framework

Legacy

Sakai 2.1.0 is just under one million lines of code

Sakai 2.1 Release Mgt

• Carol Dippel• Glenn Golden• Clay Fenalson• Peter Knoop• David Haines• Lydia Li• Josh Holzman• Ray Davis• Margaret Petit• Crystal Hancock• Zhen Qian

• Charles Severance• Lance Speelmon• Rob Lowden• Mike Elledge• Oliver Heyer• Ed Smiley• Daisy Flemming• Gonzalo Silverio• Jim Eng• Seth Therauilt• Stephen Marquad

Sakai 2.1 - Numbers

• JIRA– 1752 Issues Updated– 684 Bugs Resolved– 233 Tasks Completed

• SVN– Sakai 2.0 - 550 svn commits – Sakai 2.1 - 3793 svn commits (through

r4344)

Sakai 2.1: Process in Transition

• Sakai 1.0, 1.5, and 2.0 were managed “Sakai Project Style”– Central control– Controlled communication– Kind of like a company

• Sakai 2.1 needed to be managed “Sakai Foundation Style” to the extent possible– Expand commit lists (started in March 2005)– Manage the 2.1 release in the open– Kind of like a community

Process Changes for 2.1

• My Goal: Just be more open on all fronts– Send regular status reports including good, bad, and the

ugly straight to the dev list– Publish all tags, and target dates openly– Discuss bugs, JIRA, problems, and progress openly– When plans had to change - just admit and change the plans

in public– When tradeoffs had to be made - discuss rationale in public– No “internal” mailing list - no internal announcements (i.e.

tags, release candidates, etc)– Break down communication barriers between QA and

Development teams– Invite more folks to the release management calls

Sakai Committersajpoland@iupui.eduandersjb@iupui.eduandrew@caret.cam.ac.ukangell@pdx.eduarwhyte@umich.edubenbr@mit.edubfhawkins@mac.combkirschn@umich.educcount@mit.educhmaurer@iupui.educhris.coppola@rsmart.comclayf@bu.educsev@umich.educwen@iupui.edudaisyf@stanford.edudlhaines@umich.eduesmiley@stanford.eduggolden@umich.edugql@mit.edugsilver@umich.eduhedrick@rutgers.eduhquinn@stanford.eduhtripath@indiana.eduian@caret.cam.ac.uk

janderse@umich.edujeffkahn@mit.edujholtzman@berkeley.edujimeng@umich.edujlannan@iupui.edujleasia@umich.edujohn.ellis@rsmart.comkevin.carpenter@rsmart.comlance@indiana.edulydial@stanford.edumarkjnorton@earthlink.netmichael.desimone@rsmart.comnatjohns@indiana.eduoliver@media.berkeley.eduray@media.berkeley.edurdiblasi@iupui.edurshastri@iupui.edurwellis@umich.edus-githens@northwestern.eduslt@columbia.edusuiyy@umich.eduvgoenka@sungardsct.comzach.thomas@txstate.eduzqian@umich.eduzqingru@stanford.edu

aaronz@vt.eduadmin@makash.org.ilalceu@unisinos.bralex@asic.udl.esandrew.petro@yale.eduanthony.atkins@vt.educaseyd1@stanford.eduCarol ManchóDavid Barrosoduffy@email.arizona.edufribeiro@ufp.ptgonzalez.cynthia@itesm.mxIl-hwan Kimjim.doherty@gmail.com jmingsun@unisa.ac.zaJose Garciakajita@nagoya-u.jpkasper@pagels.dkKun Lvmachrist@cs.indiana.edumj_tsai@yahoo.comsalmon@salmon.sksdonovan@unisa.ac.zaTianhua Dingudcsweb@unisa.ac.zavdberj@unisa.ac.zayves.epelboin@upmc.fr

Contributors

Becoming A Committer

• Figure out some chunk of Sakai• Become a contributor working through a

current committer in that area• At some point you will be contributing so

much that the committers will – Realize that you are a great asset to the group

and quite sharp and – get tired of putting in your changes for you and

make you a committer

Sakai Project Leaders• Framework - Glenn Golden• Resources Tool - Jim Eng• OSP - John Ellis• Samigo - Lydia Li / Marc

Brierley• Gradebook - Ray Davis• I18n - Beth Kirshner• Web Services - Steven

Githens• Providers - Charles Severance• Site Info - Zhen Qian• Schedule - Joanne Sui• WSRP - Vishal Goenka

• Legacy Tools - John Leasia• Sections Tool - Josh

Holzman• Wiki - Ian Boston• Roster - Lance Speelmon• Syllabus - Chen Wen• Profile - Lance Speelmon• Admin Tools - Glenn Golden• Skin/CSS - Gonzalo Silverio• Portal Integration - Charles

Severance / Andrew Petro• TwinPeaks - Jeff Kahn• lancs.uk - Adrian Fish

How 2.0 Branched

2.1

2.0.x

Indiana

2.0

2.1

UM2.0.1

Fea

ture

s

Jun 05 Aug 05 Oct 05 Dec 05

How 2.0 Branched

Jun 05 Aug 05 Oct 05

2.1

2.0.xIndiana

2.0

2.1UM2.0.1

Dan

ger

->

Dec 05

Everyone Else in 2.0

Jun 05 Aug 05 Oct 05

2.1

2.0.xIndiana

2.0

2.1UM2.0.1

Dan

ger

->

Dec 05

2.1 Branch Plan

2.2

2.1.x2.1

2.22.1.1

Dan

ger

->

Dec 05

2.1.2

2.2_nnn

QA

QAQA

QA

User Visible Features in 2.1

• Improved Resources Tool with Meta-Objects• Section Tool• Group Support in Site Info• Announcements Tool Section-Aware• Samigo Section-Aware• Gradebook Section-Aware• Course Site Template Out of the Box• Localizations - completed and partial

New Resources Tool

Meta Objects

Section Tool

Group Support

Gradebook Section-Aware

Course Site Template

Localization

Localization Status

• Substantially complete– Chinese (China) - Tianhua Ding, Kun Lv– Korean - Il-hwan Kim– Dutch - Jim Doherty

• Partial– Japanese - Tatsuki Sugura / Shoji Kajita

Localiztions in Progress

• Danish - Kasper Pagels

• Hebrew - Dov Winer • Brazilian Portugese

- Alceu Fernandes Filho

• Portugese - Feliz Gouveia

• Slovokian - Michal Mosovic

• Catalan - Alex Balleste

• Chinese (Taiwan)• French - Yves

Epelboin• Spanish - Cynthia

Gonzalez

Sakai 2.1 Framework

• AuthzGroups - Groups within Sites

• SecurityAdvisor - Multi-context Authz

• Provider Cleanup – CourseProvider getTab– UserDirectory providerOrder, alwaysCreate

• Rutgers MySql Performance Changes

• Entity Producer - Refactor

Pre-AuthZGroup Structures

Site: CS1

Roster: CS1

doglezhencsevlancemarc

InTATAStSt

In: rwd TA: rwSt: r

ID: F05 CS1 A

doglecsevlance

InTASt

ID: F05 CS1 B

doglezhenmarc

InTASt

Course/RealmProviders

AuthZGroups in 2.1

Site: CS1

Roster: CS1 B

doglecsevlance

InTASt

Roster: CS1 A

doglezhenmarc

InTASt

In: rwd TA: rwdSt: r

In: rwd TA: rwdSt: r

Roster: CS1

doglezhencsevlancemarc

InTATAStSt

In: rwd TA: rSt: r

ID: F05 CS1 A

doglecsevlance

InTASt

ID: F05 CS1 B

doglezhenmarc

InTASt

SectionTool

Site: CS1

Roster: CS1 B

doglecsevlance

InTASt

Roster: CS1 A

doglezhenmarc

InTASt

In: rwd TA: rwdSt: r

In: rwd TA: rwdSt: r

Roster: CS1

doglezhencsevlancemarc

InTATAStSt

In: rwd TA: rSt: r

ID: F05 CS1

SectionTool

Protecting a Resource

/content/eecs280 content.read

AccessServlet

ResourcesService

Attaching a Resource Across Sites

/content/eecs280 content.read

01/02/05blah

/site/sakai-dev schedule.read

AccessServlet

ScheduleService

Access is allowed for eecs280 content.read users but not for sakai-dev users so this fails in the sakai-dev schedule attachment case.

ResourcesService

Attaching a Resource (compromise)

/content/eecs280 content.read

/attachments/FF987DEF

01/02/05blah

/site/sakai-dev schedule.read

AccessServlet

ResourcesService

ScheduleService

Copy

Using SecurityAdvisor

/content/eecs280 content.read

01/02/05blah

/site/sakai-dev schedule.read

AccessServlet

ResourcesService

ScheduleService

When schedule tool sends the user to Access, Schedule adds a SecurityAdvisor. This allows the bypass of the normal security protecting the content.

EntityProducer

• Re-factored the 2.0 Resources Interface and made much more rich

• Allows cleaner “drop-in” of new capabilities by distributing brittle code in central locations into each of the Components– Function creation and management (melete.author)– AuthZGroup resolution (Reference.java)

• Ends up adding constraints to Components which produce “entities”

• Going forward will enable other capabilities like improved import/export, hierarchy, search, fine-grained entity reuse, etc..

Provisional Tools

• Came from the “bundle” debate we have had throughout the project– We needed something between “yes” and “no”

• Re-thought the inclusion/exclusion decision from a “community or peers” perspective rather than top-down central approach

• Came up with a set of criteria• Provisional tools are “almost in” Sakai

– Part of the release– Available and tested during QA period– Hidden in the release with a simple way to unhide

Provisional Criteria

• Community Support– Must have commit list and be in SVN– Must run in production at >=2 sites– Must have proper license– Must be willing to answer questions– Need test plans and specifications– Needs to be tracked in JIRA

Provisional Criteria (cont)

• Technical– Support HSQL, MySql, Oracle– Use AutoDDL properly– Use sakai.properties– Do AUTHZ functions like the rest of Sakai– No patches to other elements– Must cluster– Use proper versions of Spring, Hibernate, etc.

Provisional Criteria (cont.)

• Interaction and Visual Design– Inherit skins properly– Look “like” the rest of Sakai tools (fit in)– Follow interaction designs in style guide– Use JSF UI Components (if applicable)– Include help - properly added to the Sakai

Help system

Provisional Tools (cont)

• Desirable elements (required for full inclusion)– Internationalized– Accessible (including a review)– Separation of persistence and business logic into a properly

factored Sakai Component – Event generation as appropriate– Fit logically scope-wise with the rest of Sakai

• Process– Notify community 30 days before code freeze to allow

comment– If problems arise during QA that are not easily fixed,

provisional tools are dropped

*Sample* Attribute Matrix

Announce Melete Jforum Rwiki Profile

AutoDDL Yes Yes Yes Yes Yes

Properties Yes Yes No Yes Yes

MySql Yes Yes Yes Yes Yes

Oracle Yes Yes No Yes Yes

Skinnable Yes Yes No Yes Yes

Cluster Yes No Yes Yes Yes

Resource Yes No No Yes No

I18N Yes Yes Yes ?? Yes

Events Yes No No No No

Provisional Tools For 2.1

• SakaiScript - Web Services– Steven Githens - Lead

• WSRP - Web Services For Remote Portals– Vishal Goenka - Lead

• Become User Tool– Zach Thomas - Lead

• Roster Tool– Lance Speelmon - Lead

• Wiki - Based on Radeox– Ian Boston - Lead

• TwinPeaks - DR OSID– Jeff Kahn - Lead

SU Tool

TwinPeaks

Wiki

Roster

WSRP Side-by-Side

Portlet = Placement

Kernel Tool Registry

Sakai WSRP Provider

Tool A Tool B Tool C

Site Placements

Request Filter

Apache WSRP4J

WSRP Consumer(uPortal)

Web Services

MercuryPlacements

WSRPArchitecture

List Portlets Tool ID

Placement ID

Get Markup

URL Rewriting

Sakai 2.2 *Potentials*

• The Hierarchy “Grail”• Pluggable WSYWIG• Re-factor Resources into

Helpers• Co-Release with OSP• CourseManagement• Internal DR OSID• Accessibility

Improvements• JSR-168/WSRP CSS• Unit Test Framework

• Section Aware Tools• WSRP Producer Portal• Provisional Tools

– MailTool– IU Message Center– Melete– JSR-168 Portlet– IMS Tool Portability– Blog (lancs.uk)– WSRP Consumer

• RSS• Tool ID Based URLs

Way Long Term

• Sakai / uPortal tightly integrated– JSR-168, WSRP Consumer, WSRP Producer

• JSR-170 - Java Content Repository• IMS Content Packaging Import and Export• IMS Common Cartridge• Lucene• SCORM• Enhanced LAMS integration• All domain objects fully modeled with published data

models and RDF/OWL support

Sakai Community Practices

• Board has initiated a group to examine and document process practices with the “Duffy document” and the Requirements DG work

• While that work goes on, existing efforts will also– Keep opening up - evolve project behavior patterns into

community behavior patterns– Begin to record existing de-facto processes and then review

and see how the existing processes can be improved

• Looking forward, we need to keep a mindset of “community of peers”

Sakai Foundation Board Principles• There’s acceptance that contribution to the code and contribution to the project will

be provided in a variety of forms.  Contributions are encouraged and made as easy as possible.

• The best way to positively effect the outcome of Sakai is to contribute resources to the project.

• The focus of centralized activities will be to maximize the effectiveness of the community, making the large number of resources as effective as they can be.

• The Sakai Foundation central staff will be light weight and depend on the community for major development efforts

• All the processes and activities in the Sakai community should strive for as much transparency and syndication of its activities as possible in recipient friendly format.

• The process needs to be clear and well-known and well-publicized so that anybody in the community knows how to participate to make something happen.

• To ensure the guiding principles of the foundation vision is clear to the community.• Sakai is on a trajectory and will continue to evolve in various area, with some

things being more or less mature.

These are *DRAFT* from a brainstorming session and will evolve - likely discussed in the strategy and advocacy or some other DG. Did I say that these

are *DRAFT*??

Questions