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The Netty source connector opens a port that accepts incoming data via the configured network protocol and publish 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.

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Configuration

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

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Property

NameTypeRequiredDefaultDescription
typeStringtruetcpThe network protocol over which data is transmitted to netty.

Below are the available options:
  • tcp
  • http
  • udp
    • hostStringtrue127.0.0.1The host name or address on which the source instance listen.
    portinttrue10999The port on which the source instance listen.
    numberOfThreadsinttrue1The number of threads of Netty TCP server to accept incoming connections and handle the traffic of accepted connections.

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    Example

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

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    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!