Anonymitaet commented on a change in pull request #5593: [Docs] Add admin api
docs of Pulsar Functions
URL: https://github.com/apache/pulsar/pull/5593#discussion_r344992548
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File path: site2/docs/admin-api-functions.md
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@@ -0,0 +1,545 @@
+---
+id: admin-api-functions
+title: Manage Functions
+sidebar_label: Functions
+---
+
+**Pulsar Functions** are lightweight compute processes that
+
+* consume messages from one or more Pulsar topics
+* apply a user-supplied processing logic to each message
+* publish the results of the computation to another topic
+
+Functions can be managed via the following methods.
+
+Method | Description
+---|---
+**Admin CLI** | The [`functions`](reference-pulsar-admin.md#functions) command
of the [`pulsar-admin`](reference-pulsar-admin.md) tool.
+**REST API** |The `/admin/v3/functions` endpoint of the admin {@inject:
rest:REST:/} API.
+**Java Admin API**| The `functions` method of the {@inject:
javadoc:PulsarAdmin:/admin/org/apache/pulsar/client/admin/PulsarAdmin} object
in the [Java API](client-libraries-java.md).
+
+## Function resources
+
+You can perform the following operations on functions.
+
+### Create
+
+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`](reference-pulsar-admin.md#functions-create) subcommand.
+
+**Example**
+
+```shell
+$ 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
+
+{@inject: endpoint|POST|/admin/v3/functions/{tenant}/{namespace}/{functionName}
+
+#### Java Admin API
+
+```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
+
+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`](reference-pulsar-admin.md#functions-update) subcommand.
+
+**Example**
+
+```shell
+$ pulsar-admin functions update \
+ --tenant public \
+ --namespace default \
+ --name (the name of Pulsar Functions) \
+ --output persistent://public/default/update-output-topic \
+ # other options
+```
+
+#### REST Admin API
+
+{@inject: endpoint|PUT|/admin/v3/functions/{tenant}/{namespace}/{functionName}
+
+#### Java Admin API
+
+```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 1
+
+You can start a stopped function instance using Admin CLI, REST API or Java
Admin API.
+
+#### Admin CLI
+
+Use the [`start`](reference-pulsar-admin.md#functions-start) subcommand.
+
+```shell
+$ pulsar-admin functions start \
+ --tenant public \
+ --namespace default \
+ --name (the name of Pulsar Functions) \
+ --instance-id 1
+```
+
+#### REST API
+
+{@inject:
endpoint|POST|/admin/v3/functions/{tenant}/{namespace}/{functionName}/{instanceId}/start
+
+#### Java Admin API
+
+```java
+admin.functions().startFunction(tenant, namespace, functionName,
Integer.parseInt(instanceId));
+```
+
+### Start 2
+
+You can start all stopped function instances using Admin CLI, REST API or Java
Admin API.
+
+#### Admin CLI
+
+Use the [`start`](reference-pulsar-admin.md#functions-start) subcommand.
+
+**Example**
+
+```shell
+$ pulsar-admin functions start \
+ --tenant public \
+ --namespace default \
+ --name (the name of Pulsar Functions) \
+```
+
+#### REST API
+
+{@inject:
endpoint|POST|/admin/v3/functions/{tenant}/{namespace}/{functionName}/start
+
+#### Java
+
+```java
+admin.functions().startFunction(tenant, namespace, functionName);
+```
+
+### Stop 1
+
+You can stop a function instance with `instance-id` using Admin CLI, REST API
or Java Admin API.
+
+### Admin CLI
+
+Use the [`stop`](reference-pulsar-admin.md#functions-stop) subcommand.
+
+**Example**
+
+```shell
+$ pulsar-admin functions stop \
+ --tenant public \
+ --namespace default \
+ --name (the name of Pulsar Functions) \
+ --instance-id 1
+```
+
+#### REST API
+
+{@inject:
endpoint|POST|/admin/v3/functions/{tenant}/{namespace}/{functionName}/{instanceId}/stop
+
+#### Java Admin API
+
+```java
+admin.functions().stopFunction(tenant, namespace, functionName,
Integer.parseInt(instanceId));
+```
+
+### Stop 2
+
+You can stop all function instances using Admin CLI, REST API or Java Admin
API.
+
+#### Admin CLI
+
+Use the [`stop`](reference-pulsar-admin.md#functions-stop) subcommand.
+
+**Example**
+
+```shell
+$ pulsar-admin functions stop \
+ --tenant public \
+ --namespace default \
+ --name (the name of Pulsar Functions) \
+```
+
+#### REST API
+
+{@inject:
endpoint|POST|/admin/v3/functions/{tenant}/{namespace}/{functionName}/stop
+
+#### Java Admin API
+
+```java
+admin.functions().stopFunction(tenant, namespace, functionName);
+```
+
+### Restart 1
+
+Restart a function instance with `instance-id` using Admin CLI, REST API or
Java Admin API.
+
+#### Admin CLI
+
+Use the [`restart`](reference-pulsar-admin.md#functions-restart) subcommand.
+
+**Example**
+
+```shell
+$ pulsar-admin functions restart \
+ --tenant public \
+ --namespace default \
+ --name (the name of Pulsar Functions) \
+ --instance-id 1
+```
+
+#### REST API
+
+{@inject:
endpoint|POST|/admin/v3/functions/{tenant}/{namespace}/{functionName}/{instanceId}/restart
+
+#### Java Admin API
+
+```java
+admin.functions().restartFunction(tenant, namespace, functionName,
Integer.parseInt(instanceId));
+```
+
+### Restart 2
+
+You can restart all function instances using Admin CLI, REST API or Java admin
API.
+
+#### Admin CLI
+
+Use the [`restart`](reference-pulsar-admin.md#functions-restart) subcommand.
+
+**Example**
+
+```shell
+$ pulsar-admin functions restart \
+ --tenant public \
+ --namespace default \
+ --name (the name of Pulsar Functions) \
+```
+
+#### REST API
+
+{@inject:
endpoint|POST|/admin/v3/functions/{tenant}/{namespace}/{functionName}/restart
+
+#### Java Admin API
+
+```java
+admin.functions().restartFunction(tenant, namespace, functionName);
+```
+
+### List
+
+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`](reference-pulsar-admin.md#functions-list) subcommand.
+
+**Example**
+
+```shell
+$ pulsar-admin functions list \
+ --tenant public \
+ --namespace default
+```
+
+#### REST API
+
+{@inject: endpoint|GET|/admin/v3/functions/{tenant}/{namespace}
+
+#### Java Admin API
+
+```java
+admin.functions().getFunctions(tenant, namespace);
+```
+
+### Delete
+
+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`](reference-pulsar-admin.md#functions-delete) subcommand.
+
+**Example**
+
+```shell
+$ pulsar-admin functions delete \
+ --tenant public \
+ --namespace default \
+ --name (the name of Pulsar Functions)
+```
+
+#### REST API
+
+{@inject:
endpoint|DELETE|/admin/v3/functions/{tenant}/{namespace}/{functionName}
+
+#### Java Admin API
+
+```java
+admin.functions().deleteFunction(tenant, namespace, functionName);
+```
+
+### Get
+
+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`](reference-pulsar-admin.md#functions-get) subcommand.
+
+**Example**
+
+```shell
+$ pulsar-admin functions get \
+ --tenant public \
+ --namespace default \
+ --name (the name of Pulsar Functions)
+```
+
+#### REST API
+
+{@inject: endpoint|GET|/admin/v3/functions/{tenant}/{namespace}/{functionName}
+
+#### Java Admin API
+
+```java
+admin.functions().getFunction(tenant, namespace, functionName);
+```
+
+### Status 1
+
+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`](reference-pulsar-admin.md#functions-status) subcommand.
+
+**Example**
+
+```shell
+$ pulsar-admin functions status \
+ --tenant public \
+ --namespace default \
+ --name (the name of Pulsar Functions) \
+ --instance-id 1
+```
+
+#### REST API
+
+{@inject:
endpoint|GET|/admin/v3/functions/{tenant}/{namespace}/{functionName}/{instanceId}/status
+
+#### Java Admin API
+
+```java
+admin.functions().getFunctionStatus(tenant, namespace, functionName,
Integer.parseInt(instanceId));
+```
+
+### Status 2
+
+You can get the current status of a Pulsar function instance using Admin CLI,
REST API or Java Admin API.
Review comment:
```suggestion
You can get the current status of all Pulsar function instances using Admin
CLI, REST API or Java Admin API.
```
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