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Manage Functions

tip

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

CategoryMethodIf you want to manage functions...
Pulsar CLIpulsar-admin, which lists all commands, flags, descriptions, and more.See the functions command
Pulsar admin APIsREST API, which lists all parameters, responses, samples, and more.See the /admin/v3/functions endpoint
Pulsar admin APIsJava 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.

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

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.

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

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.

Use the start subcommand.

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

Start all instances of a function​

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

Use the start subcommand.

Example

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

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.

Use the stop subcommand.

Example

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

Stop all instances of a function​

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

Use the stop subcommand.

Example

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

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.

Use the restart subcommand.

Example

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

Restart all instances of a function​

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

Use the restart subcommand.

Example

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

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.

Use the list subcommand.

Example

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

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.

Use the delete subcommand.

Example

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

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.

Use the get subcommand.

Example

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

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.

Use the status subcommand.

Example

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

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.

Use the status subcommand.

Example

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

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.

Use the stats subcommand.

Example

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

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.

Use the stats subcommand.

Example

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

Trigger a function​

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

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)

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.

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\"}"

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.

Use the querystate subcommand.

Example

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