In cluster mode, you can specify the parallelism (the number of instances to run) to enable parallel processing for a function.
Example1
Specify the --parallelism flag of the create command when deploying a function.
bin/pulsar-admin functions create \ --parallelism 3 \ # Other function info
:::tip
For an existing function, you can adjust the parallelism by using the update command.
:::
Example2
**Specify the parallelism parameter when deploying a function configuration through YAML.
# function-config.yaml parallelism: 3 inputs: - persistent://public/default/input-1 output: persistent://public/default/output-1 # other parameters
For an existing function, you can adjust the parallelism by using the update command as follows.
bin/pulsar-admin functions update \ --function-config-file function-config.yaml