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[Doc] Update *Overview of Connector* (apache#5183)
Fix apache#5015
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| id: io-overview | ||
| title: Pulsar IO Overview | ||
| title: Pulsar connector overview | ||
| sidebar_label: Overview | ||
| --- | ||
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| Messaging systems are most powerful when you can easily use them in conjunction with external systems like databases and other messaging systems. **Pulsar IO** is a feature of Pulsar that enables you to easily create, deploy, and manage Pulsar **connectors** that interact with external systems, such as [Apache Cassandra](https://cassandra.apache.org), [Aerospike](https://www.aerospike.com), and many others. | ||
| Messaging systems are most powerful when you can easily use them with external systems like databases and other messaging systems. | ||
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| > #### Pulsar IO and Pulsar Functions | ||
| > Under the hood, Pulsar IO connectors are specialized [Pulsar Functions](functions-overview.md) purpose-built to interface with external systems. The [administrative interface](io-quickstart.md) for Pulsar IO is, in fact, quite similar to that of Pulsar Functions. | ||
| **Pulsar IO connectors** enable you to easily create, deploy, and manage connectors that interact with external systems, such as [Apache Cassandra](https://cassandra.apache.org), [Aerospike](https://www.aerospike.com), and many others. | ||
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| ## Sources and sinks | ||
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| Pulsar IO connectors come in two types: | ||
| ## Concept | ||
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| * **Sources** feed data *into* Pulsar from other systems. Common sources include other messaging systems and "firehose"-style data pipeline APIs. | ||
| * **Sinks** are fed data *from* Pulsar. Common sinks include other messaging systems and SQL and NoSQL databases. | ||
| Pulsar IO connectors come in two types: **source** and **sink**. | ||
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| This diagram illustrates the relationship between sources, sinks, and Pulsar: | ||
| This diagram illustrates the relationship between source, Pulsar, and sink: | ||
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|  | ||
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| ## Working with connectors | ||
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| Pulsar IO connectors can be managed via the [`pulsar-admin`](reference-pulsar-admin.md) CLI tool, in particular the [`source`](reference-pulsar-admin.md#source) and [`sink`](reference-pulsar-admin.md#sink) commands. | ||
| ### Source | ||
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| > For a guide to managing connectors in your Pulsar installation, see the [Getting started with Pulsar IO](io-quickstart.md) | ||
| > Sources **feed data from external systems into Pulsar**. | ||
| The following connectors are currently available for Pulsar: | ||
| Common sources include other messaging systems and firehose-style data pipeline APIs. | ||
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| For the complete list of Pulsar built-in source connectors, see [source connector](io-connectors.md#source-connector). | ||
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| ### Sink | ||
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| > Sinks **feed data from Pulsar into external systems**. | ||
| Common sinks include other messaging systems and SQL and NoSQL databases. | ||
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| For the complete list of Pulsar built-in sink connectors, see [sink connector](io-connectors.md#sink-connector). | ||
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| ## Work with connector | ||
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| You can manage Pulsar connectors (for example, create, update, start, stop, restart, reload, delete and perform other operations on connectors) via the [Connector CLI](reference-connector-admin.md) with [sources](reference-connector-admin.md#sources) and [sinks](reference-connector-admin.md#sinks) subcommands. | ||
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| Connectors (sources and sinks) and Functions are components of instances, and they all run on Functions workers. When managing a source, sink or function via **Pulsar admin CLI** (that is, [Connector CLI](reference-connector-admin.md) and [Functions CLI](functions-cli.md)), an instance is started on a worker. For more information, see [Functions worker](functions-worker.md#run-functions-worker-separately). | ||
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| |Name|Java Class|Documentation| | ||
| |---|---|---| | ||
| |[Aerospike sink](https://www.aerospike.com/)|[`org.apache.pulsar.io.aerospike.AerospikeSink`](https://github.com/apache/pulsar/blob/master/pulsar-io/aerospike/src/main/java/org/apache/pulsar/io/aerospike/AerospikeStringSink.java)|[Documentation](io-aerospike.md)| | ||
| |[Cassandra sink](https://cassandra.apache.org)|[`org.apache.pulsar.io.cassandra.CassandraSink`](https://github.com/apache/pulsar/blob/master/pulsar-io/cassandra/src/main/java/org/apache/pulsar/io/cassandra/CassandraStringSink.java)|[Documentation](io-cassandra.md)| | ||
| |[Kafka source](https://kafka.apache.org)|[`org.apache.pulsar.io.kafka.KafkaSource`](https://github.com/apache/pulsar/blob/master/pulsar-io/kafka/src/main/java/org/apache/pulsar/io/kafka/KafkaStringSource.java)|[Documentation](io-kafka.md#source)| | ||
| |[Kafka sink](https://kafka.apache.org)|[`org.apache.pulsar.io.kafka.KafkaSink`](https://github.com/apache/pulsar/blob/master/pulsar-io/kafka/src/main/java/org/apache/pulsar/io/kafka/KafkaStringSink.java)|[Documentation](io-kafka.md#sink)| | ||
| |[Kinesis sink](https://aws.amazon.com/kinesis/)|[`org.apache.pulsar.io.kinesis.KinesisSink`](https://github.com/apache/pulsar/blob/master/pulsar-io/kinesis/src/main/java/org/apache/pulsar/io/kinesis/KinesisSink.java)|[Documentation](io-kinesis.md#sink)| | ||
| |[RabbitMQ source](https://www.rabbitmq.com)|[`org.apache.pulsar.io.rabbitmq.RabbitMQSource`](https://github.com/apache/pulsar/blob/master/pulsar-io/rabbitmq/src/main/java/org/apache/pulsar/io/rabbitmq/RabbitMQSource.java)|[Documentation](io-rabbitmq.md#sink)| | ||
| |[Twitter Firehose source](https://developer.twitter.com/en/docs)|[`org.apache.pulsar.io.twitter.TwitterFireHose`](https://github.com/apache/pulsar/blob/master/pulsar-io/twitter/src/main/java/org/apache/pulsar/io/twitter/TwitterFireHose.java)|[Documentation](io-twitter.md#source)| | ||
| |[CDC Connector](https://debezium.io/)|[`org.apache.pulsar.io.kafka.connect.KafkaConnectSource`](https://github.com/apache/pulsar/blob/master/pulsar-io/kafka-connect-adaptor/src/main/java/org/apache/pulsar/io/kafka/connect/KafkaConnectSource.java)|[Documentation](io-cdc.md)| |