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Building Grid Portals with OGCE: Big Red Portal and GTLAB

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  1. Building Grid Portals with OGCE: Big Red Portal and GTLAB Mehmet A. Nacar, Jong Youl Choi, Marlon Pierce, Geoffrey Fox Community Grids Lab Indiana University

  2. Introduction • This is a two-part talk on OGCE activities • Part 1: using OGCE’s current grid portal release to build a basic gateway for IU’s BigRed • Jong Youl Choi • Zero to Done in 2 months. YMMV • Part 2: simplifying the process for building portals like this using tag libraries. • Mehmet A. Nacar • Finishing up ~2 years of software development • Big Red supercomputer is part of TeraGrid at Indiana University • 2048 cluster nodes, 4 terabyte memory • For more information on Big Red, see the Monday tutorial.

  3. Portlets for Big Red • We have developed several portlets for Big Red based on the OGCE software • Improved batch job submission for LoadLeveler (IU) and PBS (NCSA). • MEME job submission • Interactive and batch • Includes both GridFTP and GRAM clients • Job tracking. • MOAB queue monitoring for both entire machine and the specific user. • Access to existing IU resources like the IU Knowledge Base. • These portlets also work with other TeraGrid resources. • We tested across IU and NCSA resources.

  4. Meme Portlet The MEME portlet uses OGCE portal libraries to upload and download files, submit jobs, and monitor their progress.

  5. Dashboard Portlet The dashboard portlet allows users to track jobs on the selected resource. The user can view either his own set of jobs or get information on all submitted jobs.

  6. OGCE IFrame Portlet can be used to integrate external sites.

  7. OGCE GPIR portlet can interoperate with TeraGrid GPIR services.

  8. Manage TeraGrid MyProxy credentials with the OGCE ProxyManager portlets.

  9. OGCE file management client portlets interact with TeraGrid GridFTP servers.

  10. In addition to MEME, general purpose batch and interactive job submission to GRAM, WS-GRAM is supported.

  11. Using TeraGrid Resources • Although utilizing Big Red, the portlets can be used with any other gateway in TeraGrid • Certificate username and local system user names may be different. • To avoid confusion, we submit a whoami command to retrieve correct username at first place. • Aside: Why can’t we have just one user name for all TeraGrid resources? • GSI-enabled SSH users: see http://communitygrids.blogspot.com/2007/06/teragrid-single-sign-on.html • Dashboard portlet facilitates this schema by using GRAM service.

  12. Problems with Portlet Development • Grid portlets typically wrap each single Grid capability in a separate portlet • Problem is that Grid portlets need to combine these operations • Portlets are entire web applications, so we need a component model for portlets: reusable portlet parts • JSF uses Inversion of Control pattern to implement its Model-View-Controller architecture • Remove dependencies on the Servlet API. • Backing beans are just beans, so can be reused more easily outside of web and portlet applications. • JSF also provides an extensible framework (tag libraries) • Apache JSF portlet bridge allows you to convert standalone JSF applications (development phase) into portlets (deployment phase).

  13. Grid Tag Libraries and Beans (GTLAB) • GTLAB provides common components for building portlets using tags and reusable parts. • The goal of GTLAB to simplify Grid portlet development • Enable rapid development • GTLAB capabilities include Grid operations with XML based tags within Java Server Faces (JSF) framework. • Grid tag libraries are built using JSF custom component development techniques • Grid tags are interfaces to backing Grid beans • End users pass values to Grid beans by using tag attributes. • We build on Java CoG 4’s abstraction layer. • Each backing Grid bean has equal capability with a portlet application in case of Grid portlet approach.

  14. GTLAB Example • Grid tags are associated with Grid services via Grid beans • Grid Beans wrap the Java COG Kit (version 4) • We show an example JSF page section below. • This allows you to develop new Grid portlets with no additional Java code. <html> <body> <f:form> <o:submit id=”test” action=”next_page” /> <o:myproxy id=”pr” hostname=”gf1.ucs.indiana.edu” port=”7512” lifetime=”2” username=“mnacar” password=”***” /> <o:jobsubmit id=”task” hostname=”cobalt.ncsa.teragrid.org” provider=”GT4” executable=”/bin/ls” stdout=”tmp/result stderr=”tmp/error” /> </o:submit> </f:form> </body> </html>

  15. How to integrate GTLAB Multitask provides a simple Directed Acyclic Graph (DAG) This example demonstrates a composite Grid job using multi-staged multitask GTLAB handles lifecycle of DAG within JSF application

  16. How to prepare application pages • Developers embed Grid tags snippet into JSF page • These components are non-visual and are not displayed in HTML. • Resource bean provides bridging with form inputs and GTLAB framework. • <h:outputText value="Taskname: "/>   <h:inputText value="#{resource.taskname}" />   <o:multitask id="multi" persistent="true" task name="#{resource.taskname}" /> • Dynamic values to Grid tag attributes are provided by Resource bean. • Only visual component is <o:submit/> tag that is associated with action method of GTLAB.

  17. GTLAB Dashboard PortletExample <o:submit id=”track” action=”list_page” /> <o:multitask id=”dashboard” taskname=”track” persistent=”true” > <o:myproxy id=”proxy” hostname=”gf1.ucs.indiana.edu” lifetime=”2” username=”#{resource.username}” password=”#{resource.password}” /> <o:jobsubmit id=”jobA” hostname=”cobalt.ncsa.teragrid.org” provider=”GT4” executable=”/bin/whoami” stdout=”tmp/result” stderr=”tmp/error” /> <o:jobsubmit id=”jobB” hostname=”cobalt.ncsa.teragrid.org” provider=”GT4” executable=”/bin/showq” stdin=”tmp/result” stdout=”tmp/list” stderr=”tmp/error” /> <o:dependency id=”depend” task=”jobB” dependsOn=”jobA” /> </o:multitask> </o:submit>

  18. Tracking and Managing Jobs • GTLAB manages lifecycles of jobs and monitor their status. • Grid operations are usually batch processes • We provide callback mechanism to follow up the jobs • GTLAB creates handlers for jobs and persistently stores them. • GTLAB handlers manages the job events such as stop, cancel or resuming the running jobs. • GTLAB provides archive for job metadata and allows managing the archive • Handler tag helps to organize user’s job repository • <o:handler id=”delete” action="#{monitor.delete}" > <f:param id="task" name="taskname“ value="#{task}"/> </o:handler>

  19. GTLAB Related Work • Grid Portlets 1.3 of GridSphere • Now they are trying to decouple with GridSphere. It’s called Vine (Portlet Vine) asseparate project • Grid Portlets 1.3 provide API and UI tags to build Grid portlets • RSF (Reasonable Server Faces) • Derived from JSF, but it separates HTML pages and backing beans • RSF provides non-visual components unlike JSF • Beans can be contained by Spring like containers. • Lifecycles of beans managed by Spring • OGCE portlets • Packages Velocity, JSP and JSF portlets • Provides portlet package for several Grid applications such as Globus, Condor, SRB and GPIR

  20. More Information • GTLAB version 1.0 Beta release available at • http://grids.ucs.indiana.edu/users/manacar/GTLAB-website • See link from main OGCE web site • http://www.collab-ogce.org • Contact OGCE: discuss@ogce.org • Contact me: mpierce@cs.indiana.edu • Contact Mehmet: mnacar@indiana.edu

  21. Conclusion and Future Work • We have described a science gateway to IU’s Big Red supercomputer. • Initial effort was to build the portal based on OGCE portlets • Described the process for creating Grid portlets using GTLAB. • We gained rapid development by using reusable components • We are investigating abstracting our approach to support different workflow engines. • Investigate integrating AJAX with our session management and monitoring. • Please come to the Web 2.0 BOF Tuesday evening. 24

  22. Acknowledgments This work is supported by the National Science Foundation’s Information Technology Research (NSF grant ITR-0428774, 0427264, 0426867 VLab) and Middleware Initiative (NSF Grant SCI 0330613) programs.