Public/Add-DatabricksPythonJob.ps1

<#
.SYNOPSIS
Creates Python Job in Databricks. Script uses Databricks API 2.0 create job query: https://docs.azuredatabricks.net/api/latest/jobs.html#create
 
.DESCRIPTION
Creates Python Job in Databricks. Script uses Databricks API 2.0 create job query: https://docs.azuredatabricks.net/api/latest/jobs.html#create
If the job name exists it will be updated instead of creating a new job.
 
.PARAMETER BearerToken
Your Databricks Bearer token to authenticate to your workspace (see User Settings in Datatbricks WebUI)
 
.PARAMETER Region
Azure Region - must match the URL of your Databricks workspace, example: northeurope
 
.PARAMETER JobName
Name of the job that will appear in the Job list. If a job with this name exists
it will be updated.
 
.PARAMETER ClusterId
The ClusterId of an existing cluster to use. Optional.
 
.PARAMETER SparkVersion
Spark version for cluster that will run the job. Example: 4.0.x-scala2.11
Note: Ignored if ClusterId is populated.
     
.PARAMETER NodeType
Type of worker for cluster that will run the job. Example: Standard_D3_v2.
Note: Ignored if ClusterId is populated.
 
.PARAMETER DriverNodeType
Type of driver for cluster that will run the job. Example: Standard_D3_v2.
If not provided the NodeType will be used.
Note: Ignored if ClusterId is populated.
 
.PARAMETER MinNumberOfWorkers
Number of workers for cluster that will run the job.
Note: If Min & Max Workers are the same autoscale is disabled.
Note: Ignored if ClusterId is populated.
 
.PARAMETER MaxNumberOfWorkers
Number of workers for cluster that will run the job.
Note: If Min & Max Workers are the same autoscale is disabled.
Note: Ignored if ClusterId is populated.
 
.PARAMETER Timeout
Timeout, in seconds, applied to each run of the job. If not set, there will be no timeout.
 
.PARAMETER MaxRetries
An optional maximum number of times to retry an unsuccessful run. A run is considered to be unsuccessful if it completes with a FAILED result_state or INTERNAL_ERROR life_cycle_state. The value -1 means to retry indefinitely and the value 0 means to never retry. If not set, the default behavior will be never retry.
 
.PARAMETER ScheduleCronExpression
By default, job will run when triggered using Jobs UI or sending API request to run. You can provide cron schedule expression for job's periodic run. How to compose cron schedule expression: http://www.quartz-scheduler.org/documentation/quartz-2.1.x/tutorials/tutorial-lesson-06.html
 
.PARAMETER Timezone
Timezone for Cron Schedule Expression. Required if ScheduleCronExpression provided. See here for all possible timezones: http://joda-time.sourceforge.net/timezones.html
Example: UTC
 
.PARAMETER PythonPath
Path to the py script in Databricks that will be executed by this Job. Must be a DBFS location from root, example "dbfs:/folder/file.py".
 
.PARAMETER PythonParameters
Optional parameters that will be provided to script when Job is executed. Example: "val1", "val2"
 
.PARAMETER Libraries
Optional. Array of json strings. Example: '{"pypi":{package:"simplejson"}}', '{"jar", "DBFS:/mylibraries/test.jar"}'
 
.PARAMETER PythonVersion
2 or 3 - defaults to 2.
 
.PARAMETER InitScripts
Init scripts to run post creation. Example: "dbfs:/script/script1", "dbfs:/script/script2"
 
.PARAMETER SparkEnvVars
An object containing a set of optional, user-specified environment variable key-value pairs. Key-value pairs of the form (X,Y) are exported as is (i.e., export X='Y') while launching the driver and workers.
Example: '@{SPARK_WORKER_MEMORY="29000m";SPARK_LOCAL_DIRS="/local_disk0"}
 
.PARAMETER Spark_conf
Hashtable.
Example @{"spark.speculation"=$true; "spark.streaming.ui.retainedBatches"= 5}
 
.PARAMETER CustomTags
Custom Tags to set, provide hash table of tags. Example: @{CreatedBy="SimonDM";NumOfNodes=2;CanDelete=$true}
 
.PARAMETER RunImmediate
Switch.
Performs a Run Now task instead of creating a job. The process is executed immediately in an async process.
Setting this option returns a RunId.
 
.EXAMPLE
PS C:\> Add-DatabricksPythonJob -BearerToken $BearerToken -Region $Region -JobName "Job1" -SparkVersion "4.1.x-scala2.11" -NodeType "Standard_D3_v2" -MinNumberOfWorkers 2 -MaxNumberOfWorkers 2 -Timeout 100 -MaxRetries 3 -ScheduleCronExpression "0 15 22 ? * *" -Timezone "UTC" -PythonPath "/Shared/TestPython.py" -PythonParameters "val1", "val2" -Libraries '{"pypi":{package:"simplejson"}}', '{"jar": "DBFS:/mylibraries/test.jar"}'
 
The above example create a job on a new cluster.
     
.NOTES
Author: Simon D'Morias / Data Thirst Ltd
#>


Function Add-DatabricksPythonJob {  
    [cmdletbinding()]
    param (
        [parameter(Mandatory = $true)][string]$BearerToken,    
        [parameter(Mandatory = $true)][string]$Region,
        [parameter(Mandatory = $true)][string]$JobName,
        [parameter(Mandatory = $false)][string]$ClusterId,
        [parameter(Mandatory = $false)][string]$SparkVersion,
        [parameter(Mandatory = $false)][string]$NodeType,
        [parameter(Mandatory = $false)][string]$DriverNodeType,
        [parameter(Mandatory = $false)][int]$MinNumberOfWorkers,
        [parameter(Mandatory = $false)][int]$MaxNumberOfWorkers,
        [parameter(Mandatory = $false)][int]$Timeout,
        [parameter(Mandatory = $false)][int]$MaxRetries,
        [parameter(Mandatory = $false)][string]$ScheduleCronExpression,
        [parameter(Mandatory = $false)][string]$Timezone,
        [parameter(Mandatory = $true)][string]$PythonPath,
        [parameter(Mandatory = $false)][string[]]$PythonParameters,
        [parameter(Mandatory = $false)][string[]]$Libraries,
        [parameter(Mandatory = $false)][ValidateSet(2,3)] [string]$PythonVersion=3,
        [parameter(Mandatory = $false)][hashtable]$Spark_conf,
        [parameter(Mandatory = $false)][hashtable]$CustomTags,
        [parameter(Mandatory = $false)][string[]]$InitScripts,
        [parameter(Mandatory = $false)][hashtable]$SparkEnvVars,
        [parameter(Mandatory = $false)][switch]$RunImmediate
    ) 

    [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
    $InternalBearerToken = Format-BearerToken($BearerToken)
    $Region = $Region.Replace(" ","")

    $ExistingJobs = Get-DatabricksJobs -BearerToken $BearerToken -Region $Region

    $ExistingJobDetail = $ExistingJobs | Where-Object {$_.settings.name -eq $JobName} | Select-Object job_id -First 1

    if ($ExistingJobDetail){
        $JobId = $ExistingJobDetail.job_id[0]
        Write-Verbose "Updating JobId: $JobId"
        $Mode = "reset"
    } 
    else{
        $Mode = "create"
    }

    $JobBody = @{}

    if ($RunImmediate.IsPresent){
        $JobBody['run_name'] = $JobName
    }
    else{
        $JobBody['name'] = $JobName
    }

    If ($ClusterId){
        $JobBody['existing_cluster_id'] = $ClusterId
    }
    else {
        $ClusterArgs = @{}
        $ClusterArgs['SparkVersion'] = $SparkVersion
        $ClusterArgs['NodeType'] = $NodeType
        $ClusterArgs['MinNumberOfWorkers'] = $MinNumberOfWorkers
        $ClusterArgs['MaxNumberOfWorkers'] = $MaxNumberOfWorkers
        $ClusterArgs['DriverNodeType'] = $DriverNodeType
        $ClusterArgs['Spark_conf'] = $Spark_conf
        $ClusterArgs['CustomTags'] = $CustomTags
        $ClusterArgs['InitScripts'] = $InitScripts
        $ClusterArgs['SparkEnvVars'] = $SparkEnvVars
        $ClusterArgs['PythonVersion'] = $PythonVersion

        $JobBody['new_cluster'] = (GetNewClusterCluster @ClusterArgs)
    }

    If ($PSBoundParameters.ContainsKey('Timeout')) {$JobBody['timeout_seconds'] = $Timeout}
    If ($PSBoundParameters.ContainsKey('MaxRetries')) {$JobBody['max_retries'] = $MaxRetries}
    If ($PSBoundParameters.ContainsKey('ScheduleCronExpression')) {
        $JobBody['schedule'] = @{"quartz_cron_expression"=$ScheduleCronExpression;"timezone_id"=$Timezone}
    }

    $Python = @{}
    $Python['python_file'] = $PythonPath
    If (($PSBoundParameters.ContainsKey('PythonParameters')) -and ($null -ne $PythonParameters)) {
        If ($PythonParameters.Count -eq 1) {
            $PythonParameters += '{"DummyKey":"1"}'
        }
        $Python['parameters'] = $PythonParameters
    }

    $JobBody['spark_python_task'] = $Python

    If (($PSBoundParameters.ContainsKey('Libraries')) -and ($null -ne $Libraries)) {
        If ($Libraries.Count -eq 1) {
            $Libraries += '{"DummyKey":"1"}'
        }
        $JobBody['libraries'] = $Libraries | ConvertFrom-Json
    }

    If ($Mode -eq 'create'){
        $Body = $JobBody
    }
    else {
        $Body = @{}
        $Body['job_id']= $JobId
        $Body['new_settings'] = $JobBody
    }

    $BodyText = $Body | ConvertTo-Json -Depth 10
    $BodyText = Remove-DummyKey $BodyText

    Write-Verbose $BodyText
  
    Try {
        if ($RunImmediate.IsPresent){
            $Url = "jobs/runs/submit"
        }
        else{
            $Url = "jobs/$Mode"
        }        
        $JobDetails = Invoke-RestMethod -Method Post -Body $BodyText -Uri "https://$Region.azuredatabricks.net/api/2.0/$Url" -Headers @{Authorization = $InternalBearerToken}
    }
    Catch {
        Write-Output "StatusCode:" $_.Exception.Response.StatusCode.value__ 
        Write-Output "StatusDescription:" $_.Exception.Response.StatusDescription
        Write-Error $_.ErrorDetails.Message
    }

    if ($RunImmediate.IsPresent){
        Return $JobDetails.run_id
    }
    else{
        if ($Mode -eq "create") {
            Return $JobDetails.job_id
        }
        else {
            Return $JobId
        }
    }   

    
}