Configuration Reference

Pulsar function configurations

This table lists all fields available for creating a Pulsar function.

Field	Description	Default
`auto-ack`	Whether or not the framework acknowledges messages automatically.	true
`classname`	The class name of a Pulsar function.
`CPU`	The CPU in cores that need to be allocated per function instance (applicable only to docker runtime).
`custom-runtime-options`	A string that encodes options to customize the runtime.
`custom-schema-inputs`	The map of input topics to Schema class names (as a JSON string).
`custom-serde-inputs`	The map of input topics to SerDe class names (as a JSON string).
`dead-letter-topic`	The topic where all messages that were not processed successfully are sent. This parameter is not supported in Python Functions.
`disk`	The disk in bytes that need to be allocated per function instance (applicable only to docker runtime).
`fqfn`	The Fully Qualified Function Name (FQFN) for the function.
`function-config-file`	The path to a YAML config file specifying the configuration of a Pulsar function.
`go`	Path to the main Go executable binary for the function (if the function is written in Go). Go Functions are not supported in StreamNative Cloud.
`inputs`	The input topic or topics of a Pulsar function (multiple topics can be specified as a comma-separated list).
`jar`	Path to the jar file for the function (if the function is written in Java). It also supports URL-path [http/https/file (file protocol assumes that file already exists on worker host)] from which worker can download the package.
`log-topic`	The topic to which the logs of a Pulsar function are produced.
`max-message-retries`	How many times should we try to process a message before giving up.
`name`	The name of a Pulsar function.
`namespace`	The namespace of a Pulsar function.
`output`	The output topic of a Pulsar function (If none is specified, no output is written).
`output-serde-classname`	The SerDe class to be used for messages output by the function.
`parallelism`	The parallelism factor of a Pulsar function (i.e. the number of function instances to run).
`processing-guarantees`	The processing guarantees (delivery semantics) applied to the function. Available values: [ATLEAST_ONCE, ATMOST_ONCE, EFFECTIVELY_ONCE].	ATLEAST_ONCE
`py`	Path to the main Python file/Python Wheel file for the function (if the function is written in Python).
`ram`	The ram in bytes that need to be allocated per function instance (applicable only to process/docker runtime).
`retain-ordering`	Function consumes and processes messages in order.
`schema-type`	The builtin schema type or custom schema class name to be used for messages output by the function.	<empty string>
`sliding-interval-count`	The number of messages after which the window slides.
`sliding-interval-duration-ms`	The time duration after which the window slides.
`subs-name`	Pulsar source subscription name if user wants a specific subscription-name for the input-topic consumer.
`tenant`	The tenant of a Pulsar function.
`timeout-ms`	The message timeout in milliseconds.
`topics-pattern`	The topic pattern to consume from a list of topics under a namespace that matches the pattern. [--input] and [--topic-pattern] are mutually exclusive. Add SerDe class name for a pattern in --custom-serde-inputs (only supported in Java Pulsar function).
`user-config`	User-defined config key/values.
`window-length-count`	The number of messages per window.
`window-length-duration-ms`	The time duration of the window is milliseconds.

StreamNative Cloud custom runtime options

To facilitate submitting Pulsar functions based on your requirements, Function on Cloud service provides some custom options via custom-runtime-options.

Note

When update functions/sinks/sources with custom runtime options, the original custom runtime options will be replaced by the new ones, so make sure all the wanted fields are passed in the custom runtime options when you do the update.

This table lists all fields available for custom options.

Name	Type	Default	Description
`clusterName`	String	N/A	The Pulsar cluster of a Pulsar function, source, or sink.
`inputTypeClassName`	String	`[B`	The map of input topics to Java class names.
`outputTypeClassName`	String	`[B`	The map of output topics to Java class names.
`maxReplicas`	Integer	`0`	The maximum number of Pulsar instances that you want to run for this Pulsar Function. When the value of the `maxReplicas` parameter is greater than the value of `replicas`, it indicates that the Functions controller automatically scales the Pulsar Functions based on the CPU usage. By default, `maxReplicas` is set to 0, which indicates that auto-scaling is disabled.
`env`	Map < String, String >	N/A	The environment variables being attached to a Pod that is created by the Function Mesh Operator for the cluster.
`imagePullSecrets`	List < String >	N/A	A list of references to secrets in the same namespace for pulling any of the images used by a Pod.
`logLevel`	String	info	The log levels for Pulsar functions. For details, see log levels.
`logRotationPolicy`	String	N/A	The log rotation policies for Pulsar functions. You can set the log rotation policies based on the time or the log file size. For details, see log rotation policies.
`runnerImageTag`	String	N/A	The tag of the runner image that is used to submit a function, source, or sink.
`hpaSpec` (Preview)	HPASpec	N/A	The Kubernetes HorizontalPodAutoscaler settings. For details, see Kubernetes documentation. This feature may not ready for your cluster enviroment, please file a ticket if you want this feature enabled.
`logFormat`	String	text	The log format that defines how the content of a log file should be interpreted. Available options are `json` and `text`. The log format configurations are only available for the Java and Python runtimes.
`logTopic`	String	N/A	Used for sinks/sources since they don't have a log topic argument like functions
`logTopicAgent`	String	runtime	The log agent that defines how StreamNative cloud redirects your functions / connectors log into a Pulsar topic. Available options are `runtime` and `sidecar`. When use `sidecar` all logs (including instance logs) will be sent to the log topic by filebeat (better performance than `runtime`), else will use the Pulsar Functions runtime's log-topic implementation instead.
`genericKind`	String	N/A	Used for functions written in languages other than Java and Python, available values are `executable`, `nodejs`, `wasm`
`terminationGracePeriodSeconds`	Long	N/A	the amount of time that kubernetes will give for a pod before terminating it.

User could compose the custom runtime options as a JSON string and pass it to custom-runtime-options field. For example:

{
  "inputTypeClassName": "java.lang.String",
  "outputTypeClassName": "java.lang.String",
  "maxReplicas": 0
}

Then it could be passed to custom-runtime-options field as follows:

pulsarctl functions create --custom-runtime-options '{"inputTypeClassName":"java.lang.String","outputTypeClassName":"java.lang.String","maxReplicas":0}' ...