Netty source connector

note

You can download all the Pulsar connectors on download page.

The Netty source connector opens a port that accepts incoming data via the configured network protocol and publishes it to user-defined Pulsar topics.

This connector can be used in a containerized (for example, k8s) deployment. Otherwise, if the connector is running in process or thread mode, the instance may be conflicting on listening to ports.

Configuration

The configuration of the Netty source connector has the following properties.

Property

Name	Type	Required	Default	Description
type	String	true	tcp	The network protocol over which data is transmitted to netty. Below are the available options: tcp http udp
host	String	true	127.0.0.1	The host name or address on which the source instance listen.
port	int	true	10999	The port on which the source instance listen.
numberOfThreads	int	true	1	The number of threads of Netty TCP server to accept incoming connections and handle the traffic of accepted connections.

Example

Before using the Netty source connector, you need to create a configuration file through one of the following methods.

• JSON

  {
     "configs": {
        "type": "tcp",
        "host": "127.0.0.1",
        "port": "10911",
        "numberOfThreads": "1"
     }
  }

• YAML

  configs:
      type: "tcp"
      host: "127.0.0.1"
      port: 10999
      numberOfThreads: 1

Usage

The following examples show how to use the Netty source connector with TCP and HTTP.

TCP

1. Start Pulsar standalone.

   docker pull apachepulsar/pulsar:{version}
   
   docker run -d -it -p 6650:6650 -p 8080:8080 -v $PWD/data:/pulsar/data --name pulsar-netty-standalone apachepulsar/pulsar:{version} bin/pulsar standalone

2. Create a configuration file netty-source-config.yaml.

   configs:
       type: "tcp"
       host: "127.0.0.1"
       port: 10999
       numberOfThreads: 1

3. Copy the configuration file netty-source-config.yaml to Pulsar server.

   docker cp netty-source-config.yaml pulsar-netty-standalone:/pulsar/conf/

4. Download the Netty source connector.

   docker exec -it pulsar-netty-standalone /bin/bash
   curl -O http://mirror-hk.koddos.net/apache/pulsar/pulsar-{version}/connectors/pulsar-io-netty-{version}.nar

5. Start the Netty source connector.

   ./bin/pulsar-admin sources localrun \
   --archive pulsar-io-@pulsar:version@.nar \
   --tenant public \
   --namespace default \
   --name netty \
   --destination-topic-name netty-topic \
   --source-config-file netty-source-config.yaml \
   --parallelism 1

6. Consume data.

   docker exec -it pulsar-netty-standalone /bin/bash
   ./bin/pulsar-client consume -t Exclusive -s netty-sub netty-topic -n 0

7. Open another terminal window to send data to the Netty source.

   docker exec -it pulsar-netty-standalone /bin/bash
   apt-get update
   apt-get -y install telnet
   root@1d19327b2c67:/pulsar# telnet 127.0.0.1 10999
   Trying 127.0.0.1...
   Connected to 127.0.0.1.
   Escape character is '^]'.
   hello
   world

8. The following information appears on the consumer terminal window.

   ----- got message -----
   hello
   
   ----- got message -----
   world

HTTP

1. Start Pulsar standalone.

   docker pull apachepulsar/pulsar:{version}
   docker run -d -it -p 6650:6650 -p 8080:8080 -v $PWD/data:/pulsar/data --name pulsar-netty-standalone apachepulsar/pulsar:{version} bin/pulsar standalone

2. Create a configuration file netty-source-config.yaml.

   configs:
       type: "http"
       host: "127.0.0.1"
       port: 10999
       numberOfThreads: 1

3. Copy the configuration file netty-source-config.yaml to Pulsar server.

   docker cp netty-source-config.yaml pulsar-netty-standalone:/pulsar/conf/

4. Download the Netty source connector.

   docker exec -it pulsar-netty-standalone /bin/bash
   curl -O http://mirror-hk.koddos.net/apache/pulsar/pulsar-{version}/connectors/pulsar-io-netty-{version}.nar

5. Start the Netty source connector.

   ./bin/pulsar-admin sources localrun \
   --archive pulsar-io-@pulsar:version@.nar \
   --tenant public \
   --namespace default \
   --name netty \
   --destination-topic-name netty-topic \
   --source-config-file netty-source-config.yaml \
   --parallelism 1

6. Consume data.

   docker exec -it pulsar-netty-standalone /bin/bash
   ./bin/pulsar-client consume -t Exclusive -s netty-sub netty-topic -n 0

7. Open another terminal window to send data to the Netty source.

   docker exec -it pulsar-netty-standalone /bin/bash
   curl -X POST --data 'hello, world!' http://127.0.0.1:10999/

8. The following information appears on the consumer terminal window.

   ----- got message -----
   hello, world!