Job Agents
On start, Job Agents spawn a configurable amount of Job Containers as separate system processes. Job Agents are responsible for redirecting incoming jobs from their assigned queue to the locally spawned Job Containers via REST communication. The spawned Job Containers serve solely as executing unit for RapidMiner processes. Job Containers are kept alive as long as the Job Agent application runs and will automatically shut down when the managing Job Agent shuts down.
This page outlines how to configure a Job Agent. Please refer to thearchitecturepage to read more about the Job Agent and Job Container structure overview.
Configuration
Agent Properties
You can alter the configuration of the Job Agent by setting the corresponding environment variable. The variables are described inside this tableJob Agent Settings．Besides settings like the amount of spawned Job Containers or the maximum amount of used memory per Job Container, it is also possible to configure more complex behavior outlined in the following sub-sections.
Container ports
When Job Containers are spawned as separate system processes during the Job Agent's startup, they are bound to system ports. This is necessary because the Job Agent communicates via REST endpoint with them, e.g. to redirect jobs or to retrieve a job's latest status. The Job Agent will use successive ports beginning from the defined starting port. The last port is determined by the amount of configured Job Containers, e.g. if1000is defined as starting port and four Job Containers should be spawned in total, the Job Agent will bind the ports1000,1001,1002and1003．Job Containers only listen locally and are unreachable from anywhere else thanlocalhost/127.0.0.1．
Container restart policies
By default, Job Containers will run indefinitely and not restart after a job has been executed. With this behavior, it's possible to execute huge amounts of jobs nearly instantly. A possible downside is that jobs might have an effect on each other when run sequentially. To overcome this, it is possible to assign restart policies to Job Containers. Supported restart policies are: run indefinitely, terminate after a configurable amount of executed processes and restart on a regular basis via cron expression. When a restart is invoked, the currently active job execution will be finished before the job containers are restarted. To change this behavior, it's possible to set theJOBAGENT_RESTART_TIMEOUTenvironment variable. The Job Agent will then kill the Job Containers forcibly after the execution time exceeds this timeout regardless if it's still running.
Container caching for Projects
When a process from aProjectis executed by a Job Container, the Job Container will first download the corresponding project files in order to use them during execution. After the process finishes, those temporary working files are deleted. If process execution changes project files, they are automatically added as a new Snapshot.
Because Job Containers need to download project files, it will take time for large projects and thus process execution time might increase due to this. In order to reduce this initial time to download files, each Job Container caches already downloaded Projects by applying a caching strategy. This behavior can be adjusted by changing the value of theJOBAGENT_CONTAINER_REPOSITORY_CACHING_STRATEGYvariable. By default, a Job Container will keep two Projects in cache and replace the least recently used one when a new Project needs to be downloaded. For more details about which different strategies exist and how they can be configured to fit your needs, please have a look at the descriptions of theJob Agent Settings．
Graceful Job Agent shutdown
Job Agents will by default wait for all job executions to finish before shutting down. This can however be avoided by setting the Job Agent'sJOBAGENT_SHUTDOWN_TIMEOUT．
Container Properties
You can add properties to a Job Container dependingwhenyou like to have them available. In general, Job Containers reference their properties in two different ways:
- on start and
- when a job is going to be executed.
On start
When a new Job Container has been spawned by a Job Agent, theexecution contextdefined in{homeDir} / config / rapidminer /。RapidMineris being copied to the Job Container so that it can use it during execution. You can place your own configuration files into this directory if you need it for your extensions.
You can also use theCentral resource managementto synchronize theexecution contextfrom theRapidMiner年代erver home folder．
It is also possible to add additional properties during Job Container Studio initialization. This is particularly useful if you need to provide extension properties which are already required during Job Container start, e.g. when operators are registered. To set these properties, you can use theJOBAGENT_CONTAINER_JVM_CUSTOM_OPTIONSenvironment variable, which is described inContainer JVM arguments:
- Use
jobagent.container.init-with-properties.enabledto enable or disable, disabled by default - Use
jobagent.container.init-with-properties.locationto set an absolute location to a properties file, defaults torapidminer-init.propertiesin the{homeDir}/config/rapidminer/folder
Those property files are not automatically synchronized and might need to be adapted for each Job Agent instance you've deployed.
On queuing a new job
When you submit a job to a queue, it is picked up by the corresponding Job Agent responsible for this queue. Afterwards it is forwarded to a Job Container managed by this Job Agent via REST. Whenever this happens, the properties file{homeDir}/config/rapidminer/rapidminer.propertiesis read by the Job Agent and its contents are piped into the job so that the Job Container can use them as system properties and therefore they are also exposed to extensions during execution. Remember, that properties are overwritten for new jobs. This means that changing the file between executions results in different property values being propagated to the Job Container for different jobs.
This file can also beused to provide custom properties (e.g. extension properties) for a Job Containerbut which are not already required during Job Container start.
Container JVM arguments
Job Containers are started by their Job Agent with a default set of JVM arguments, e.g. something likeXX:+UseG1GC．
Toaddadditional arguments which will be transposed to the Job Container, set theJOBAGENT_CONTAINER_JVM_CUSTOM_OPTIONSenvironment variable and add new properties by specifying them similar toJOBAGENT_CONTAINER_JVM_CUSTOM_OPTIONS= -Dnew.property=new -Danother.property=another．This will transpose-Dnew.property=new -Danother.property=anotherto each Job Container spawned by a Job Agent.
请注意,整个改过的价值yJVM_CUSTOM_OPTIONSwill be transposed to the Job Container start arguments. Any error in this might lead to the Job Container not spawning correctly anymore.
If necessary, it's also possible tooverride all default JVM argumentsalthough we highly advise against it. In certain use cases this might still be feasible and needed. Tooverridethem you need to set theJOBAGENT_CONTAINER_JVM_PROPERTIESenvironment variable and define something similar toJOBAGENT_CONTAINER_JVM_PROPERTIES = Dtest.property1=test1,Dtest.property2=test2．Ensure that any default argument which you need is still present. All JVM default arguments are printed in theagent.logwhen the Job Agent starts.
Please notice that there are no leading hyphens and that properties are separated via comma for theJOBAGENT_CONTAINER_JVM_PROPERTIESproperty.
Container proxy usage
Proxy usage can be configured inside the Job Container using therapidminer.propertiesfile inside the$jaHomeDir/config/rapidminerfolder. Property names are the same as when you configure a proxy inside年代tudio Proxy．
Extract necessary values from your．/RapidMiner/rapidminer-studio-settings.cfgconfiguration file, for example like the following.
rapidminer.proxy.mode=Manual proxy configuration rapidminer.proxy.https.proxyHost=myproxy.domain.tld rapidminer.proxy.https.proxyPort=8443The Job Container will pick those values up and use them throughout execution.
If your proxy requires authentication, e.g. basic auth, proceed like you would in Studio by using the年代tudio Walletto manage your passwords. Afterwards, copy the．RapidMiner/encryptionand．RapidMiner/credentials.xmlfiles into the execution context folder{homeDir} / config / rapidminer /。RapidMinerof the Job Container. By default, the necessary files will be picked up during Job Container start. The default symmetric key used for that is expected to be{homeDir} / config / rapidminer /。RapidMiner/encryption/symmetric/default-local-context.rmek．
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To enable correct execution of RapidMiner processes the Job Agent uses various external resources like JDBC drivers, RapidMiner extensions, custom Java libraries, and RapidMiner Server licenses. These resources are stored within the{homeDir}/resources/folder of the Job Agent.
Central resource management
The Job Agent's external resources are centrally managed and automatically synchronized from the RapidMiner Server instance the Job Agent is connected to. Also theExecution contextwill be synchronized by default to all Job Agents.
Resource management
Centrally managed Job Agent resources are stored in theresource/folder of theRapidMiner年代erver home folder．Both RapidMiner Server and all connected Job Agents use the same set of resources.
To install a new or manage an existing centrally managed resources do the following:
- 年代elect the resource type you want to update (JDBC, Extensions, Custom libraries)
- From the table below locate the path of the resource type you want to update
- Update the resource type by adding or removing content from the selected folder
- Restart RapidMiner Server. All connected Job Agents will automatically synchronize the new resource configuration from RapidMiner Server.
| Type | Path |
|---|---|
| JDBC | |
| Extensions | |
| Custom libraries | |
| Licenses | Licenses are automatically synced to connected Job Agents on license installation via the RapidMiner Server UI |
| Execution context | |
Automatic synchronization
By default, all resources and the execution context are automatically synchronized from the RapidMiner Server instance after the Job Agent has been started. Also, the resources are synchronized after a restart of the RapidMiner Server instance.
The Job Agent downloads the resources to the type specific resource folder and overwrites all potential existing files. These type specific resource folders are:
| Type | Path |
|---|---|
| JDBC | |
| Extensions | |
| Custom libraries | |
| Licenses | |
| Execution context | |
Individual resource management
To setup a Job Agent with an individual resources that differ from the centrally managed resource set the automatic synchronization can be disabled by settingjobagent.sync.enabled = falsein theconfig/agent.propertiesfile. After a restart of the Job Agent it will only use the resources that are already available in the respective resource folders.
To install a new or manage an existing local resources do the following:
- 年代hutdown the Job Agent
- Locate the path of the resource type you want to update
- Update the resource type by adding or removing content from the selected folder
- Restart the Job Agent
Resource types
JDBC
JDBC connections can be defined in the{homeDir}/resources/jdbc/jdbc_properties.xmlfile.
Extensions
Extensions are provided from{homeDir}/resources/extensions/目录中。
Custom libraries
Custom libraries are Java libraries which you can be used in a RapidMiner process, for example within theExecute Scriptoperator. You can add these libraries to the{homeDir}/resources/libs/folder and then they are automatically available for execution.
Don't confuse custom libraries withJDBC driversorextensions．
Licenses
The Job Agent licenses are installed in the{homeDir}/resources/licenses/目录中。
You can define the number of spawned Job Containers (jobagent.container.count) for each Job Agent and the memory per Job Container (jobagent.container.memory-limit) in the{homeDir}/config/agent.propertiesfile. Keep in mind that these settings need to comply with your current server license.
Execution context
TheExecution contextfor each Job Container are copied over from{homeDir} / config / rapidminer /。RapidMinerduring Job Container start.
