Database scheme

Database scheme

Database scheme (red lines seem PRIMARY KEY, blue lines seem INDEX)

Note : all dates and duration are stored in an integer manner (number of seconds since the EPOCH).

accounting

Fields Types Descriptions
window_start INT UNSIGNED start date of the accounting interval
window_stop INT UNSIGNED stop date of the accounting interval
accounting_user VARCHAR(20) user name
accounting_project VARCHAR(255) name of the related project
queue_name VARCHAR(100) queue name
consumption_type ENUM(“ASKED”, “USED”) “ASKED” corresponds to the walltimes specified by the user. “USED” corresponds to the effective time used by the user.
consumption INT UNSIGNED number of seconds used
Primary key:window_start, window_stop, accounting_user, queue_name, accounting_project, consumption_type
Index fields:window_start, window_stop, accounting_user, queue_name, accounting_project, consumption_type

This table is a summary of the consumption for each user on each queue. This increases the speed of queries about user consumptions and statistic generation.

Data are inserted through the command oaraccounting (when a job is treated the field accounted in table jobs is passed into “YES”). So it is possible to regenerate this table completely in this way :

  • Delete all data of the table:

    DELETE FROM accounting;
    
  • Set the field accounted in the table jobs to “NO” for each row:

    UPDATE jobs SET accounted = "NO";
    
  • Run the oaraccounting command.

You can change the amount of time for each window : edit the oar configuration file and change the value of the tag ACCOUNTING_WINDOW.

schema

Fields Types Descriptions
version VARCHAR(255) database schema version number
name VARCHAR(255) optional name

This table is used to store the version of the database schema.

So the oar-database command be used to automatically upgrade the schema from any version with:

oar-database --setup

admission_rules

Fields Types Descriptions
id INT UNSIGNED id number
rule TEXT rule written in Perl applied when a job is going to be registered
Primary key:id
Index fields:None

You can use these rules to change some values of some properties when a job is submitted. So each admission rule is executed in the order of the id field and it can set several variables. If one of them exits then the others will not be evaluated and oarsub returns an error.

The rules can be added with the following command:

oaradmissionrules -n

Some examples are better than a long description:

  • Specify the default value for queue parameter

    if (not defined($queue_name)) {
        $queue_name="default";
    }
    
  • Avoid users except oar to go in the admin queue

    if (($queue_name eq "admin") && ($user ne "oar")) {
      die("[ADMISSION RULE] Only oar user can submit jobs in the admin queue\n");
    }
    
  • Restrict the maximum of the walltime for interactive jobs

    my $max_walltime = OAR::IO::sql_to_duration("12:00:00");
    if ($jobType eq "INTERACTIVE"){
      foreach my $mold (@{$ref_resource_list}){
        if (
          (defined($mold->[1])) and
          ($max_walltime < $mold->[1])
        ){
          print("[ADMISSION RULE] Walltime to big for an INTERACTIVE job so it is set to $max_walltime.\n");
          $mold->[1] = $max_walltime;
        }
      }
    }
    
  • Specify the default walltime

    my $default_wall = OAR::IO::sql_to_duration("2:00:00");
    foreach my $mold (@{$ref_resource_list}){
      if (!defined($mold->[1])){
        print("[ADMISSION RULE] Set default walltime to $default_wall.\n");
        $mold->[1] = $default_wall;
      }
    }
    
  • How to perform actions if the user name is in a file

    open(FILE, "/tmp/users.txt");
    while (($queue_name ne "admin") and ($_ = <FILE>)){
      if ($_ =~ m/^\\s*$user\\s*$/m){
        print("[ADMISSION RULE] Change assigned queue into admin\n");
        $queue_name = "admin";
      }
    }
    close(FILE);
    
  • How to automatically add a job type depending of the walltime and an estimation of the number of resources of the job

    foreach my $e (estimate_job_nb_resources($dbh_ro, $ref_resource_list, $jobproperties)){
      #print("AREA: $e->{nbresources} x $e->{walltime} = ".$e->{nbresources} * $e->{walltime}."\n");
      if ($e->{nbresources} * $e->{walltime} > 24*3600*1){
        print("[ADMISSION RULE] Your job is of the 'big' type\n");
        push(@{$type_list},"big");
        last;
      }
    }
    

You can print all the admission rules with:

oaradmissionrules -S -f

event_logs

Fields Types Descriptions
event_id INT UNSIGNED event identifier
type VARCHAR(50) event type
job_id INT UNSIGNED job related of the event
date INT UNSIGNED event date
description VARCHAR(255) textual description of the event
to_check ENUM(‘YES’, ‘NO’) specify if the module NodeChangeState must check this event to Suspect or not some nodes
Primary key:event_id
Index fields:type, to_check

The different event types are:

  • “PING_CHECKER_NODE_SUSPECTED” : the system detected via the module “finaud” that a node is not responding.
  • “PROLOGUE_ERROR” : an error occurred during the execution of the job prologue (exit code != 0).
  • “EPILOGUE_ERROR” : an error occurred during the execution of the job epilogue (exit code != 0).
  • “CANNOT_CREATE_TMP_DIRECTORY” : OAR cannot create the directory where all information files will be stored.
  • “CAN_NOT_WRITE_NODE_FILE” : the system was not able to write file which had to contain the node list on the first node (/tmp/OAR_job_id).
  • “CAN_NOT_WRITE_PID_FILE” : the system was not able to write the file which had to contain the pid of oarexec process on the first node (/tmp/pid_of_oarexec_for_job_id).
  • “USER_SHELL” : the system was not able to get informations about the user shell on the first node.
  • “EXIT_VALUE_OAREXEC” : the oarexec process terminated with an unknown exit code.
  • “SEND_KILL_JOB” : signal that OAR has transmitted a kill signal to the oarexec of the specified job.
  • “LEON_KILL_BIPBIP_TIMEOUT” : Leon module has detected that something wrong occurred during the kill of a job and so kill the local bipbip process.
  • “EXTERMINATE_JOB” : Leon module has detected that something wrong occurred during the kill of a job and so clean the database and terminate the job artificially.
  • “WORKING_DIRECTORY” : the directory from which the job was submitted does not exist on the node assigned by the system.
  • “OUTPUT_FILES” : OAR cannot write the output files (stdout and stderr) in the working directory.
  • “CANNOT_NOTIFY_OARSUB” : OAR cannot notify the oarsub process for an interactive job (maybe the user has killed this process).
  • “WALLTIME” : the job has reached its walltime.
  • “SCHEDULER_REDUCE_NB_NODES_FOR_RESERVATION” : this means that there is not enough nodes for the reservation and so the scheduler do the best and gives less nodes than the user wanted (this occurres when nodes become Suspected or Absent).
  • “BESTEFFORT_KILL” : the job is of the type besteffort and was killed because a normal job wanted the nodes.
  • “FRAG_JOB_REQUEST” : someone wants to delete a job.
  • “CHECKPOINT” : the checkpoint signal was sent to the job.
  • “CHECKPOINT_ERROR” : OAR cannot send the signal to the job.
  • “CHECKPOINT_SUCCESS” : system has sent the signal correctly.
  • “SERVER_EPILOGUE_TIMEOUT” : epilogue server script has time outed.
  • “SERVER_EPILOGUE_EXIT_CODE_ERROR” : epilogue server script did not return 0.
  • “SERVER_EPILOGUE_ERROR” : cannot find epilogue server script file.
  • “SERVER_PROLOGUE_TIMEOUT” : prologue server script has time outed.
  • “SERVER_PROLOGUE_EXIT_CODE_ERROR” : prologue server script did not return 0.
  • “SERVER_PROLOGUE_ERROR” : cannot find prologue server script file.
  • “CPUSET_CLEAN_ERROR” : OAR cannot clean correctly cpuset files for a job on the remote node.
  • “MAIL_NOTIFICATION_ERROR” : a mail cannot be sent.
  • “USER_MAIL_NOTIFICATION” : user mail notification cannot be performed.
  • “USER_EXEC_NOTIFICATION_ERROR” : user script execution notification cannot be performed.
  • “BIPBIP_BAD_JOBID” : error when retrieving informations about a running job.
  • “BIPBIP_CHALLENGE” : OAR is configured to detach jobs when they are launched on compute nodes and the job return a bad challenge number.
  • “RESUBMIT_JOB_AUTOMATICALLY” : the job was automatically resubmitted.
  • “WALLTIME” : the job reached its walltime.
  • “REDUCE_RESERVATION_WALLTIME” : the reservation job was shrunk.
  • “SSH_TRANSFER_TIMEOUT” : node OAR part script was too long to transfer.
  • “BAD_HASHTABLE_DUMP” : OAR transfered a bad hashtable.
  • “LAUNCHING_OAREXEC_TIMEOUT” : oarexec was too long to initialize itself.
  • “RESERVATION_NO_NODE” : All nodes were detected as bad for the reservation job.

event_log_hostnames

Fields Types Descriptions
event_id INT UNSIGNED event identifier
hostname VARCHAR(255) name of the node where the event has occured
Primary key:event_id
Index fields:hostname

This table stores hostnames related to events like “PING_CHECKER_NODE_SUSPECTED”.

files

Fields Types Descriptions
idFile INT UNSIGNED  
md5sum VARCHAR(255)  
location VARCHAR(255)  
method VARCHAR(255)  
compression VARCHAR(255)  
size INT UNSIGNED  
Primary key:idFile
Index fields:md5sum

frag_jobs

Fields Types Descriptions
frag_id_job INT UNSIGNED job id
frag_date INT UNSIGNED kill job decision date
frag_state ENUM(‘LEON’, ‘TIMER_ARMED’ , ‘LEON_EXTERMINATE’, ‘FRAGGED’) DEFAULT ‘LEON’ state to tell Leon what to do
Primary key:frag_id_job
Index fields:frag_state

What do these states mean:

  • “LEON” : the Leon module must try to kill the job and change the state into “TIMER_ARMED”.
  • “TIMER_ARMED” : the Sarko module must wait a response from the job during a timeout (default is 60s)
  • “LEON_EXTERMINATE” : the Sarko module has decided that the job time outed and asked Leon to clean up the database.
  • “FRAGGED” : job is fragged.

gantt_jobs_resources

Fields Types Descriptions
moldable_job_id INT UNSIGNED moldable job id
resource_id INT UNSIGNED resource assigned to the job
Primary key:moldable_job_id, resource_id
Index fields:None

This table specifies which resources are attributed to which jobs.

gantt_jobs_resources_visu

Fields Types Descriptions
moldable_job_id INT UNSIGNED moldable job id
resource_id INT UNSIGNED resource assigned to the job
Primary key:moldable_job_id, resource_id
Index fields:None

This table is the same as gantt_jobs_resources and is used by visualisation tools. It is updated atomically (a lock is used).

gantt_jobs_predictions

Fields Types Descriptions
moldable_job_id INT UNSIGNED job id
start_time INT UNSIGNED date when the job is scheduled to start
Primary key:moldable_job_id
Index fields:None

With this table and gantt_jobs_resources you can know exactly what are the decisions taken by the schedulers for each waiting jobs.

note:The special job id “0” is used to store the scheduling reference date.

gantt_jobs_predictions_visu

Fields Types Descriptions
moldable_job_id INT UNSIGNED job id
start_time INT UNSIGNED date when the job is scheduled to start
Primary key:job_id
Index fields:None

This table is the same as gantt_jobs_predictions and is used by visualisation tools. It is made up to date in an atomic action (with a lock).

jobs

Fields Types Descriptions
job_id INT UNSIGNED job identifier
array_id INT array identifier
array_index INT index of the job in the array
initial_request TEXT oarsub initial arguments
job_name VARCHAR(100) name given by the user
cpuset_name VARCHAR(255) name of the cpuset directory used for this job on each nodes
job_type ENUM(‘INTERACTIVE’, ‘PASSIVE’) DEFAULT ‘PASSIVE’ specify if the user wants to launch a program or get an interactive shell
info_type VARCHAR(255) some informations about oarsub command
state ENUM(‘Waiting’,’Hold’, ‘toLaunch’, ‘toError’, ‘toAckReservation’, ‘Launching’, ‘Running’ ‘Suspended’, ‘Resuming’, , ‘Finishing’, ‘Terminated’, ‘Error’) job state
reservation ENUM(‘None’, ‘toSchedule’, ‘Scheduled’) DEFAULT ‘None’ specify if the job is a reservation and the state of this one
message VARCHAR(255) readable information message for the user
job_user VARCHAR(255) user name
command TEXT program to run
queue_name VARCHAR(100) queue name
properties TEXT properties that assigned nodes must match
launching_directory TEXT path of the directory where to launch the user process
submission_time INT UNSIGNED date when the job was submitted
start_time INT UNSIGNED date when the job was launched
stop_time INT UNSIGNED date when the job was stopped
file_id INT UNSIGNED  
accounted ENUM(“YES”, “NO”) DEFAULT “NO” specify if the job was considered by the accounting mechanism or not
notify VARCHAR(255) gives the way to notify the user about the job (mail or script )
assigned_moldable_job INT UNSIGNED moldable job chosen by the scheduler
checkpoint INT UNSIGNED number of seconds before the walltime to send the checkpoint signal to the job
checkpoint_signal INT UNSIGNED signal to use when checkpointing the job
stdout_file TEXT file name where to redirect program STDOUT
stderr_file TEXT file name where to redirect program STDERR
resubmit_job_id INT UNSIGNED if a job is resubmitted then the new one store the previous
project VARCHAR(255) arbitrary name given by the user or an admission rule
suspended ENUM(“YES”,”NO”) specify if the job was suspended (oarhold)
job_env TEXT environment variables to set for the job
exit_code INT DEFAULT 0 exit code for passive jobs
job_group VARCHAR(255) not used
Primary key:job_id
Index fields:state, reservation, queue_name, accounted, suspended

Explications about the “state” field:

  • “Waiting” : the job is waiting OAR scheduler decision.
  • “Hold” : user or administrator wants to hold the job (oarhold command). So it will not be scheduled by the system.
  • “toLaunch” : the OAR scheduler has attributed some nodes to the job. So it will be launched.
  • “toError” : something wrong occurred and the job is going into the error state.
  • “toAckReservation” : the OAR scheduler must say “YES” or “NO” to the waiting oarsub command because it requested a reservation.
  • “Launching” : OAR has launched the job and will execute the user command on the first node.
  • “Running” : the user command is executing on the first node.
  • “Suspended” : the job was in Running state and there was a request (oarhold with “-r” option) to suspend this job. In this state other jobs can be scheduled on the same resources (these resources has the “suspended_jobs” field to “YES”).
  • “Finishing” : the user command has terminated and OAR is doing work internally
  • “Terminated” : the job has terminated normally.
  • “Error” : a problem has occurred.

Explications about the “reservation” field:

  • “None” : the job is not a reservation.
  • “toSchedule” : the job is a reservation and must be approved by the scheduler.
  • “Scheduled” : the job is a reservation and is scheduled by OAR.

job_dependencies

Fields Types Descriptions
job_id INT UNSIGNED job identifier
job_id_required INT UNSIGNED job needed to be completed before launching job_id
Primary key:job_id, job_id_required
Index fields:job_id, job_id_required

This table is feeded by oarsub command with the “-a” option.

moldable_job_descriptions

Fields Types Descriptions
moldable_id INT UNSIGNED moldable job identifier
moldable_job_id INT UNSIGNED corresponding job identifier
moldable_walltime INT UNSIGNED instance duration
Primary key:moldable_id
Index fields:moldable_job_id

A job can be described with several instances. Thus OAR scheduler can choose one of them. For example it can calculate which instance will finish first. So this table stores all instances for all jobs.

job_resource_groups

Fields Types Descriptions
res_group_id INT UNSIGNED group identifier
res_group_moldable_id INT UNSIGNED corresponding moldable job identifier
res_group_property TEXT SQL constraint properties
Primary key:res_group_id
Index fields:res_group_moldable_id

As you can specify job global properties with oarsub and the “-p” option, you can do the same thing for each resource groups that you define with the “-l” option.

job_resource_descriptions

Fields Types Descriptions
res_job_group_id INT UNSIGNED corresponding group identifier
res_job_resource_type VARCHAR(255) resource type (name of a field in resources)
res_job_value INT wanted resource number
res_job_order INT UNSIGNED order of the request
Primary key:res_job_group_id, res_job_resource_type, res_job_order
Index fields:res_job_group_id

This table store the hierarchical resource description given with oarsub and the “-l” option.

job_state_logs

Fields Types Descriptions
job_state_log_id INT UNSIGNED identifier
job_id INT UNSIGNED corresponding job identifier
job_state ENUM(‘Waiting’, ‘Hold’, ‘toLaunch’, ‘toError’, ‘toAckReservation’, ‘Launching’, ‘Finishing’, ‘Running’, ‘Suspended’, ‘Resuming’, ‘Terminated’, ‘Error’) job state during the interval
date_start INT UNSIGNED start date of the interval
date_stop INT UNSIGNED end date of the interval
Primary key:job_state_log_id
Index fields:job_id, job_state

This table keeps informations about state changes of jobs.

job_types

Fields Types Descriptions
job_type_id INT UNSIGNED identifier
job_id INT UNSIGNED corresponding job identifier
type VARCHAR(255) job type like “deploy”, “timesharing”, ...
type_index ENUM(‘CURRENT’, ‘LOG’) index field
Primary key:job_type_id
Index fields:job_id, type

This table stores job types given with the oarsub command and “-t” options.

resources

Fields Types Descriptions
resource_id INT UNSIGNED resource identifier
type VARCHAR(100) DEFAULT “default” resource type (used for licence resources for example)
network_address VARCHAR(100) node name (used to connect via SSH)
state ENUM(‘Alive’, ‘Dead’ , ‘Suspected’, ‘Absent’) resource state
next_state ENUM(‘UnChanged’, ‘Alive’, ‘Dead’, ‘Absent’, ‘Suspected’) DEFAULT ‘UnChanged’ state for the resource to switch
finaud_decision ENUM(‘YES’, ‘NO’) DEFAULT ‘NO’ tell if the actual state results in a “finaud” module decision
next_finaud_decision ENUM(‘YES’, ‘NO’) DEFAULT ‘NO’ tell if the next node state results in a “finaud” module decision
state_num INT corresponding state number (useful with the SQL “ORDER” query)
suspended_jobs ENUM(‘YES’,’NO’) specify if there is at least one suspended job on the resource
scheduler_priority INT UNSIGNED arbitrary number given by the system to select resources with more intelligence
switch VARCHAR(50) name of the switch
cpu INT UNSIGNED global cluster cpu number
cpuset INT UNSIGNED field used with the JOB_RESOURCE_MANAGER_PROPERTY_DB_FIELD
besteffort ENUM(‘YES’,’NO’) accept or not besteffort jobs
deploy ENUM(‘YES’,’NO’) specify if the resource is deployable
expiry_date INT UNSIGNED field used for the desktop computing feature
desktop_computing ENUM(‘YES’,’NO’) tell if it is a desktop computing resource (with an agent)
last_job_date INT UNSIGNED store the date when the resource was used for the last time
available_upto INT UNSIGNED used with compute mode features to know if an Absent resource can be switch on
Primary key:resource_id
Index fields:state, next_state, type, suspended_jobs

State explications:

  • “Alive” : the resource is ready to accept a job.
  • “Absent” : the oar administrator has decided to pull out the resource. This computer can come back.
  • “Suspected” : OAR system has detected a problem on this resource and so has suspected it (you can look in the event_logs table to know what has happened). This computer can come back (automatically if this is a “finaud” module decision).
  • “Dead” : The oar administrator considers that the resource will not come back and will be removed from the pool.

This table permits to specify different properties for each resources. These can be used with the oarsub command (“-p” and “-l” options).

You can add your own properties with oarproperty command.

These properties can be updated with the oarnodesetting command (“-p” option).

Several properties are added by default:

  • switch : you have to register the name of the switch where the node is plugged.
  • cpu : this is a unique name given to each cpus. This enables OAR scheduler to distinguish all cpus.
  • cpuset : this is the name of the cpu on the node. The Linux kernel sets this to an integer beginning at 0. This field is linked to the configuration tag JOB_RESOURCE_MANAGER_PROPERTY_DB_FIELD.

resource_logs

Fields Types Descriptions
resource_log_id INT UNSIGNED unique id
resource_id INT UNSIGNED resource identifier
attribute VARCHAR(255) name of corresponding field in resources
value VARCHAR(255) value of the field
date_start INT UNSIGNED interval start date
date_stop INT UNSIGNED interval stop date
finaud_decision ENUM(‘YES’,’NO’) store if this is a system change or a human one
Primary key:None
Index fields:resource_id, attribute

This table permits to keep a trace of every property changes (consequence of the oarnodesetting command with the “-p” option).

assigned_resources

Fields Types Descriptions
moldable_job_id INT UNSIGNED job id
resource_id INT UNSIGNED resource assigned to the job
Primary key:moldable_job_id, resource_id
Index fields:moldable_job_id

This table keeps informations for jobs on which resources they were scheduled.

queues

Fields Types Descriptions
queue_name VARCHAR(100) queue name
priority INT UNSIGNED the scheduling priority
scheduler_policy VARCHAR(100) path of the associated scheduler
state ENUM(‘Active’, ‘notActive’) DEFAULT ‘Active’ permits to stop the scheduling for a queue
Primary key:queue_name
Index fields:None

This table contains the schedulers executed by the oar_meta_scheduler module. Executables are launched one after one in the specified priority.

challenges

Fields Types Descriptions
job_id INT UNSIGNED job identifier
challenge VARCHAR(255) challenge string
ssh_private_key TEXT DEFAULT NULL ssh private key given by the user (in grid usage it enables to connect onto all nodes of the job of all clusers with oarsh)
ssh_public_key TEXT DEFAULT NULL ssh public key
Primary key:job_id
Index fields:None

This table is used to share a secret between OAR server and oarexec process on computing nodes (avoid a job id being stolen/forged by malicious user).

For security reasons, this table must not be readable for a database account given to users who want to access OAR internal informations(like statistics).