Manage Functions

tip

This page only shows some frequently used operations. For the latest and complete information, see the reference docs below.

Category	Method	If you want to manage functions...
Pulsar CLI	pulsar-admin, which lists all commands, flags, descriptions, and more.	See the functions command
Pulsar admin APIs	REST API, which lists all parameters, responses, samples, and more.	See the /admin/v3/functions endpoint
Pulsar admin APIs	Java admin API, which lists all classes, methods, descriptions, and more.	See the functions method of the PulsarAdmin object

You can perform the following operations on functions.

Create a function

You can create a Pulsar function in cluster mode (deploy it on a Pulsar cluster) using Admin CLI, REST API or Java Admin API.

Admin CLI

Use the create subcommand.

Example

pulsar-admin functions create \
    --tenant public \
    --namespace default \
    --name (the name of Pulsar Functions) \
    --inputs test-input-topic \
    --output persistent://public/default/test-output-topic \
    --classname org.apache.pulsar.functions.api.examples.ExclamationFunction \
    --jar /examples/api-examples.jar

REST API

POST /admin/v3/functions/:tenant/:namespace/:functionName/registerFunction

Java

FunctionConfig functionConfig = new FunctionConfig();
functionConfig.setTenant(tenant);
functionConfig.setNamespace(namespace);
functionConfig.setName(functionName);
functionConfig.setRuntime(FunctionConfig.Runtime.JAVA);
functionConfig.setParallelism(1);
functionConfig.setClassName("org.apache.pulsar.functions.api.examples.ExclamationFunction");
functionConfig.setProcessingGuarantees(FunctionConfig.ProcessingGuarantees.ATLEAST_ONCE);
functionConfig.setTopicsPattern(sourceTopicPattern);
functionConfig.setSubName(subscriptionName);
functionConfig.setAutoAck(true);
functionConfig.setOutput(sinkTopic);
admin.functions().createFunction(functionConfig, fileName);

Update a function

You can update a Pulsar function that has been deployed to a Pulsar cluster using Admin CLI, REST API or Java Admin API.

Admin CLI

Use the update subcommand.

Example

pulsar-admin functions update \
    --tenant public \
    --namespace default \
    --name (the name of Pulsar Functions) \
    --output persistent://public/default/update-output-topic \
    # other options

REST API

PUT /admin/v3/functions/:tenant/:namespace/:functionName/updateFunction

Java

FunctionConfig functionConfig = new FunctionConfig();
functionConfig.setTenant(tenant);
functionConfig.setNamespace(namespace);
functionConfig.setName(functionName);
functionConfig.setRuntime(FunctionConfig.Runtime.JAVA);
functionConfig.setParallelism(1);
functionConfig.setClassName("org.apache.pulsar.functions.api.examples.ExclamationFunction");
UpdateOptions updateOptions = new UpdateOptions();
updateOptions.setUpdateAuthData(updateAuthData);
admin.functions().updateFunction(functionConfig, userCodeFile, updateOptions);

Start a function

You can start an instance of a function or start all instances of a function.

Start an instance of a function

You can start a stopped function instance with instance-id using Admin CLI, REST API or Java Admin API.

Admin CLI

Use the start subcommand.

pulsar-admin functions start \
    --tenant public \
    --namespace default \
    --name (the name of Pulsar Functions) \
    --instance-id 1

REST API

POST /admin/v3/functions/:tenant/:namespace/:functionName/:instanceId/start/startFunction

Java

admin.functions().startFunction(tenant, namespace, functionName, Integer.parseInt(instanceId));

Start all instances of a function

You can start all stopped function instances using Admin CLI, REST API or Java Admin API.

Admin CLI

Use the start subcommand.

Example

pulsar-admin functions start \
    --tenant public \
    --namespace default \
    --name (the name of Pulsar Functions) \

REST API

POST /admin/v3/functions/:tenant/:namespace/:functionName/start/startFunction

Java

admin.functions().startFunction(tenant, namespace, functionName);

Stop a function

You can stop an instance of a function or stop all instances of a function.

Stop an instance of a function

You can stop a function instance with instance-id using Admin CLI, REST API or Java Admin API.

Admin CLI

Use the stop subcommand.

Example

pulsar-admin functions stop \
    --tenant public \
    --namespace default \
    --name (the name of Pulsar Functions) \
    --instance-id 1

REST API

POST /admin/v3/functions/:tenant/:namespace/:functionName/:instanceId/stop/stopFunction

Java

admin.functions().stopFunction(tenant, namespace, functionName, Integer.parseInt(instanceId));

Stop all instances of a function

You can stop all function instances using Admin CLI, REST API or Java Admin API.

Admin CLI

Use the stop subcommand.

Example

pulsar-admin functions stop \
    --tenant public \
    --namespace default \
    --name (the name of Pulsar Functions)

REST API

POST /admin/v3/functions/:tenant/:namespace/:functionName/stop/stopFunction

Java

admin.functions().stopFunction(tenant, namespace, functionName);

Restart a function

You can restart an instance of a function or restart all instances of a function.

Restart an instance of a function

Restart a function instance with instance-id using Admin CLI, REST API or Java Admin API.

Admin CLI

Use the restart subcommand.

Example

pulsar-admin functions restart \
    --tenant public \
    --namespace default \
    --name (the name of Pulsar Functions) \
    --instance-id 1

REST API

POST /admin/v3/functions/:tenant/:namespace/:functionName/:instanceId/restart/restartFunction

Java

admin.functions().restartFunction(tenant, namespace, functionName, Integer.parseInt(instanceId));

Restart all instances of a function

You can restart all function instances using Admin CLI, REST API or Java admin API.

Admin CLI

Use the restart subcommand.

Example

pulsar-admin functions restart \
    --tenant public \
    --namespace default \
    --name (the name of Pulsar Functions)

REST API

POST /admin/v3/functions/:tenant/:namespace/:functionName/restart/restartFunction

Java

admin.functions().restartFunction(tenant, namespace, functionName);

List all functions

You can list all Pulsar functions running under a specific tenant and namespace using Admin CLI, REST API or Java Admin API.

Admin CLI

Use the list subcommand.

Example

pulsar-admin functions list \
    --tenant public \
    --namespace default

REST API

GET /admin/v3/functions/:tenant/:namespace/listFunctions

Java

admin.functions().getFunctions(tenant, namespace);

Delete a function

You can delete a Pulsar function that is running on a Pulsar cluster using Admin CLI, REST API or Java Admin API.

Admin CLI

Use the delete subcommand.

Example

pulsar-admin functions delete \
    --tenant public \
    --namespace default \
    --name (the name of Pulsar Functions)

REST API

DELETE /admin/v3/functions/:tenant/:namespace/:functionName/deregisterFunction

Java

admin.functions().deleteFunction(tenant, namespace, functionName);

Get info about a function

You can get information about a Pulsar function currently running in cluster mode using Admin CLI, REST API or Java Admin API.

Admin CLI

Use the get subcommand.

Example

pulsar-admin functions get \
    --tenant public \
    --namespace default \
    --name (the name of Pulsar Functions)

REST API

GET /admin/v3/functions/:tenant/:namespace/:functionName/getFunctionInfo

Java

admin.functions().getFunction(tenant, namespace, functionName);

Get status of a function

You can get the status of an instance of a function or get the status of all instances of a function.

Get status of an instance of a function

You can get the current status of a Pulsar function instance with instance-id using Admin CLI, REST API or Java Admin API.

Admin CLI

Use the status subcommand.

Example

pulsar-admin functions status \
    --tenant public \
    --namespace default \
    --name (the name of Pulsar Functions) \
    --instance-id 1

REST API

GET /admin/v3/functions/:tenant/:namespace/:functionName/:instanceId/status/getFunctionInstanceStatus

Java

admin.functions().getFunctionStatus(tenant, namespace, functionName, Integer.parseInt(instanceId));

Get status of all instances of a function

You can get the current status of a Pulsar function instance using Admin CLI, REST API or Java Admin API.

Admin CLI

Use the status subcommand.

Example

pulsar-admin functions status \
    --tenant public \
    --namespace default \
    --name (the name of Pulsar Functions)

REST API

GET /admin/v3/functions/:tenant/:namespace/:functionName/status/getFunctionStatus

Java

admin.functions().getFunctionStatus(tenant, namespace, functionName);

Get stats of a function

You can get stats of an instance of a function or get stats of all instances of a function.

Get stats of an instance of a function

You can get the current stats of a Pulsar Function instance with instance-id using Admin CLI, REST API or Java admin API.

Admin CLI

Use the stats subcommand.

Example

pulsar-admin functions stats \
    --tenant public \
    --namespace default \
    --name (the name of Pulsar Functions) \
    --instance-id 1

REST API

GET /admin/v3/functions/:tenant/:namespace/:functionName/:instanceId/stats/getFunctionInstanceStats

Java

admin.functions().getFunctionStats(tenant, namespace, functionName, Integer.parseInt(instanceId));

Get stats of all instances of a function

You can get the current stats of a Pulsar function using Admin CLI, REST API or Java admin API.

Admin CLI

Use the stats subcommand.

Example

pulsar-admin functions stats \
    --tenant public \
    --namespace default \
    --name (the name of Pulsar Functions)

REST API

GET /admin/v3/functions/:tenant/:namespace/:functionName/stats/getFunctionStats

Java

admin.functions().getFunctionStats(tenant, namespace, functionName);

Trigger a function

You can trigger a specified Pulsar function with a supplied value using Admin CLI, REST API or Java admin API.

Admin CLI

Use the trigger subcommand.

Example

pulsar-admin functions trigger \
    --tenant public \
    --namespace default \
    --name (the name of Pulsar Functions) \
    --topic (the name of input topic) \
    --trigger-value \"hello pulsar\"
    # or --trigger-file (the path of trigger file)

REST API

POST /admin/v3/functions/:tenant/:namespace/:functionName/trigger/triggerFunction

Java

admin.functions().triggerFunction(tenant, namespace, functionName, topic, triggerValue, triggerFile);

Put state associated with a function

You can put the state associated with a Pulsar function using Admin CLI, REST API or Java admin API.

Admin CLI

Use the putstate subcommand.

Example

pulsar-admin functions putstate \
    --tenant public \
    --namespace default \
    --name (the name of Pulsar Functions) \
    --state "{\"key\":\"pulsar\", \"stringValue\":\"hello pulsar\"}"

REST API

POST /admin/v3/functions/:tenant/:namespace/:functionName/state/:key/putFunctionState

Java

TypeReference<FunctionState> typeRef = new TypeReference<FunctionState>() {};
FunctionState stateRepr = ObjectMapperFactory.getThreadLocal().readValue(state, typeRef);
admin.functions().putFunctionState(tenant, namespace, functionName, stateRepr);

Fetch state associated with a function

You can fetch the current state associated with a Pulsar function using Admin CLI, REST API or Java admin API.

Admin CLI

Use the querystate subcommand.

Example

pulsar-admin functions querystate \
    --tenant public \
    --namespace default \
    --name (the name of Pulsar Functions) \
    --key (the key of state)

REST API

GET /admin/v3/functions/:tenant/:namespace/:functionName/state/:key/getFunctionState

Java

admin.functions().getFunctionState(tenant, namespace, functionName, key);