Job Submission and Resource BrokeringWP 1

Contents:

•The components

•What (should) works now and configuration

•How to submit jobs … the UI and JDL

•The UK RB and testbed

•Planned future functionality

Documentation available from:http://server11.infn.it/workload-grid/documents.htmA particularly gripping read is the “Administrator and User Guide” released last Friday.

The User Interface (UI):

All user interactions are through the UI

Installed on the submitting machine

Communicates with both the Resource Broker (RB) and the Logging Broker (LB)

On job submission the UI assigns a unique job identifier to the job (dg_jobId), sends the executable, Job Description File and Input Sandbox to the RB. It also sends notification of the submission to the LB.

The User Interface (UI):

The UI can also be used to query the status of a job… which it does by interrogating the LB

Configuration:The UI configuration is contained UI_ConfigEnv.cfg which contains the following information:• address and port of accessible RBs•     address and port of accessible LBs•   default location of the local storage areas for the Input/Output sandbox files•     default values for the JDL mandatory attributes• default number of retrials on fatal errors when

connecting to the LB.

#################################################

# LB addresses are in the format #

# <URL>:<port> of all LBs accessible by the UI #

#################################################

%%beginLB%%

https://gm04.hep.ph.ic.ac.uk:7846

%%endLB%%

###################################################

# RB addresses are in the format #

# <URL>:<port> of all RBs accessible by the UI #

###################################################

%%beginRB%%

gm04.hep.ph.ic.ac.uk:7771

%%endRB%%

###############################################

# UI needed environment settings #

# and corresponding default values #

# Format is always <var name> = <var value>. #

###############################################

## Stage IN/OUT Storage Paths ##

DEFAULT_STORAGE_AREA_IN = /tmp

## Default values for Mandatory Attributes ##

requirements = TRUE

rank = - other.EstimatedTraversalTime

The User Interface (UI):

Users concurrently using the same submitting machine use the same configuration files.

For users (or groups of users) having particular needs it is possible to “customise” the UI configuration through the -config option supported by each UI command.

The Resource Broker (RB):

Situated at a central location (not local to your machine).

Expected to have one per VO, currently one at CERN for EDG testbed and one at IC for GridPP testbed

Jobs are queued locally(stored in a PostgreSQL Database)

Interrogates the replica catalogue and the information services and attempts to match the job to an available resource. Matching is based on the Condor ClassAd Libraray.

If a suitable match is made the RB can submit the job to the Job Submission Service (JSS). Of course all events and status information is sent to the LB.

The Resource Broker (RB):

Configuration:

Most people will never need to configure their own RB. However for completeness the configuration file is: <install path>/etc/rb.conf. This contains entries for the replica catalogue, the MDS etc.

For more detailed information see the “Administrator and User Guide”.

Input/Output Sandboxes etc are stored on the machine hosting the RB and so a reasonable amount of disk space is required.

The Job Submission Service (JSS):

If the RB has successfully matched a job to a resource it is passed to the JSS (which is usually on the same machine).

The JSS queues the job internally in a PostgreSQL database.

Job submission is performed using Condor-G

The JSS also monitors job until their completion, notifying the LB of any significant events.

The Job Submission Service (JSS):

Configuration:

Again most people will need to configure a JSS sever.The configuration file is <install path>/etc/jss.conf

The Logging Broker (LB):

All events throughout the job submission, execution and output retrieval processes are logged by the LB in a MySQL database. All information is time stamped.

It is through the logged information that users are able to discover the state of their jobs.

The Logging Broker (LB):

Configuration:An LB local logger must be installed on all machines which are pushing information into the LB system (RB and JSS machines and the gatekeeper machines of each CE). An exception to this is the job submission machine which can have a local logger but it is not mandatory.

The LB server needs only be installed on a server machine.

The Logging Broker (LB):

Configuration:

The local logger requires no configuration and the server is configured when the database is created using <install path>/etc/server.sql.

No further configuration is required.

Submitting a job:

ClassAds are: Declarative – rather than procedural… that is they describe notions of compatibility rather than specifying a procedure to determine compatibilty

Simple – both syntactically and semantically … easy to use

Portable – Nothing is used that requires features specific to a given architecture

Submitting a job:

ClassAds have dynamic typing and so only values have types (not expressions)

As well as the usual types (numeric, string, Boolean) values can also have types such as time intervals and timestamps and esoteric values such as undefined and error.

ClassAds can be nested

ClassAds have the usual set of operators (See the JDL how to).

Submitting a job:An example:Executable = "WP1testF";StdOutput = "sim.out";StdError = "sim.err";InputSandbox = {"/home/datamat/sim.exe", "/home/datamat/DATA/*"};OutputSandbox = {"sim.err","sim.err","testD.out"};Rank = other.TotalCPUs;Requirements = other.LRMSType == "PBS" \&& (other.OpSys == "Linux RH 6.1" || other.OpSys == "Linux RH 6.2") && \self.Rank > 10 && other.FreeCPUs > 1;RetryCount = 2;Arguments = "file1";InputData = "LF:test10099-1001";ReplicaCatalog = "ldap://sunlab2g.cnaf.infn.it:2010/rc=WP2 INFN Test Replica Catalog,dc=sunlab2g, dc=cnaf, dc=infn, dc=it";DataAccessProtocol = "gridftp";OutputSE = "grid001.cnaf.infn.it";

Submitting a job:

AND F T U E   OR

F T U E   NOT  

F F F F E   F F T U E   F T

T F T U E   T T T T E   T F

U F U U E   U U T U E   U U

E E E E E   E E E E E   E E

Submitting a job:

–      dg-job-submitAllows the user to submit a job for execution on remote resources in a grid.  SYNOPSISdg-job-submit [-help]dg-job-submit [-version]dg-job-submit [-template]dg-job-submit <job_description_file> [-input input_file | -resource res_id] [-notify e_mail_address] [-config group_name] [-output out_file] [-noint] [-debug]

 

–      dg-get-job-outputThis command requests the RB for the job output files (specified by the OutputSandbox attribute of the job-ad) and stores them on the submitting machine local disk.  SYNOPSISdg-get-job-output [-help] dg-get-job-output [-version]dg-get-job-output < dg_jobId1 …. dg_jobIdn | -input input_file > [-dir

directory_path] [-config group_name] [-noint] [-debug] ExamplesLet us consider the following command: $> dg-get-job-output https://grid004.it:2234/124.75.74.12/12354732109721?www.rb.com:4577 –dir /home/data it retrieves the files listed in the OutputSandbox attribute from the RB and stores them locally in /home/data/12354732109721.

–      dg-list-job-match Returns the list of resources fulfilling job requirements.  SYNOPSISdg-list-job-match [-help] dg-list-job-match [-version]dg-list-job-match <job_description_file> [-verbose] [-config group_name] [-output output_file] [-noint] [-debug]

–      dg-job-cancel Cancels one or more submitted jobs.  SYNOPSISdg-job-cancel [-help] dg-job-cancel [-version]dg-job-cancel < dg_jobId1 …. dg_jobIdn | -input input_file | -all > [-notify

e_mail_address] [-config group_name] [-output output_file] [-noint] [-debug] 

–      dg-job-statusDisplays bookkeeping information about submitted jobs.  SYNOPSISdg-job-status [-help] dg-job-status [-version]dg-job-status < dg_jobId1 …. dg_jobIdn | -input input_file | -all > [-full] [-config

group_name] [-output output_file] [-noint] [-debug]

Examples$> dg-job-status dg_jobId2 displays the following lines: ********************************************************************BOOKKEEPING INFORMATIONPrinting status for the job: dg_jobId2 --- dg_JobId = firefox.esrin.esa.it__20010514_163007_21833_RB1_LB3 Job Owner =/C=IT/O=ESA/OU=ESRIN/CN=Fabrizio Pacini/Email=fpacini@datamat.itStatus = RUNNINGLocation = firefox.esa.it:2119/jobmanager-condorJob Destination = http://ramses.esrin.esa.it/rams/dataset1Status Enter Time = 10:24:32 05-06-2001 GMTLast Update Time = 10:25:45 05-06-2001 GMTCpuTime = 1********************************************************************

–      dg-get-logging-infoDisplays logging information about submitted jobs.  SYNOPSISdg-get-logging-info [-help]dg-get-logging-info [-version]dg-get-logging-info < dg_jobId1 …. dg_jobIdn | -input input_file | -all > [-

from T1] [-to T2] [-level logLevel] [-config group_name] [-output output_file] [-noint] [-debug]

Job Submission: There is a GUI

 

What is in place in the UK testbed?(an RB centric view of the world)Only GridPP and Babar VOs

Imperial

R. B.

JSS

II

LB

Bristol

Replica Catalogue

Imperial

CE, SE, UIRAL

CE, SE, UI

Birmingham

CE, UI

Liverpool

CE, UI

Bristol

CE, UI

QMUL

CE, UI

RHUL

CE, UI

IN2P3-Babar

UI

Status page (linked from GridPP web pages)

Things to come over the next year:

Release Item

1.4 Interactive jobs

2 Job Partitioning

1.3 MPI Jobs

1.3 APIs for applications

2 Accounting

2 Checkpointing and Job Partitioning

1.4 Advanced reservation

1.4 Dependent Jobs

1.2 Proxy renewal