Pulsar Connector single instance quickstart

This quickstart will walk you through the simplest possible configuration connecting a standalone Apache Pulsar™ instance to a single standalone DataStax Enterprise (DSE) 6.8 node.

Once you’ve configured Pulsar, a Pulsar sink, the DataStax Apache Pulsar™ Connector and the DSE instance, you’ll be able to send simple key/value pair messages using the Pulsar client utility, pulsar-client and retrieve them from a DSE keyspace and table.

Install and configure DSE 6.8

Install the tarball distribution of DSE 6.8 as described in Installing DataStax Enterprise 6.8 using the binary tarball.
Start DSE from the installation directory:
```
bin/dse cassandra
```

Verify that DataStax Enterprise is running from the installation directory:

bin/nodetool status
Datacenter: Cassandra
=====================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving/Stopped
--  Address    Load       Owns (effective)  Host ID    Token    Rack
UN  127.0.0.1  152.24 KiB  100.0%           <host-id>  <token>  rack1

Start cqlsh:

bin/cqlsh
Connected to Test Cluster at 127.0.0.1:9042.
[cqlsh 6.8.0 | DSE 6.8.9 | CQL spec 3.4.5 | DSE protocol v2]
Use HELP for help.
cqlsh>

Create a new keyspace, pulsar_qs:

cqlsh> CREATE KEYSPACE IF NOT EXISTS pulsar_qs
WITH replication = {
  'class' : 'SimpleStrategy',
  'replication_factor' : 1
};

Create a new table, pulsar_kv in the keyspace to hold the Pulsar message content:

cqlsh> CREATE TABLE pulsar_qs.pulsar_kv (
	key text PRIMARY KEY,
	content text
);

Install and configure Apache Pulsar

Download Apache Pulsar:

wget https://archive.apache.org/dist/pulsar/pulsar-2.7.0/apache-pulsar-2.7.0-bin.tar.gz

Untar the Pulsar binary:
```
tar xvfz apache-pulsar-2.7.0-bin.tar.gz
```
Download the DataStax Apache Pulsar Connector tar file from the DataStax downloads site. If you agree, enable the Terms checkbox and click the download icon.

Extract the files:

tar zxf cassandra-enhanced-pulsar-sink-1.4.0.tar.gz

Create a connectors directory in the Pulsar home directory if it doesn’t exist.

Copy the DataStax connector NAR to the Pulsar connectors directory:

cp installation_location/cassandra-enhanced-pulsar-sink-1.4.0.nar pulsar_home/connectors

Start Apache Pulsar in standalone mode:
```
bin/pulsar standalone
```

Open a new terminal and check that the DataStax Apache Pulsar Connector is running:

curl -s http://localhost:8080/admin/v2/functions/connectors
[{"name":"cassandra-enhanced","description":"A DataStax Pulsar Sink to load records from Pulsar topics to Apache Cassandra(R) or DataStax Enterprise(DSE)\n","sinkClass":"com.datastax.oss.sink.pulsar.RecordCassandraSinkTask"}]%

Configure the DataStax Apache Pulsar Connector

Save following YAML contents to the Pulsar configuration directory, conf as qs.yml:

configs:
  verbose: false
  batchSize: 3000
  batchFlushTimeoutMs: 1000
  topics: example_topic
  contactPoints: localhost
  loadBalancing.localDc: Cassandra
  port: 9042
  cloud.secureConnectBundle:
  ignoreErrors: None
  maxConcurrentRequests: 500
  maxNumberOfRecordsInBatch: 32
  queryExecutionTimeout: 30
  connectionPoolLocalSize: 4
  jmx: true
  compression: None
  auth:
    provider: None
    username:
    password:
    gssapi:
      keyTab:
      principal:
      service: dse
  ssl:
    provider: None
    hostnameValidation: true
    keystore:
      password:
      path:
    openssl:
      keyCertChain:
      privateKey:
    truststore:
      password:
      path:
    cipherSuites:
  topic:
    example_topic:
      pulsar_qs:
        pulsar_kv:
          mapping: 'key=key,content=value'
          consistencyLevel: LOCAL_ONE
          ttl: -1
          ttlTimeUnit : SECONDS
          timestampTimeUnit : MICROSECONDS
          nullToUnset: true
          deletesEnabled: true
      codec:
        locale: en_US
        timeZone: UTC
        timestamp: CQL_TIMESTAMP
        date: ISO_LOCAL_DATE
        time: ISO_LOCAL_TIME
        unit: MILLISECONDS

Create a new Pulsar sink:

bin/pulsar-admin sinks create \
	--name dse-sink-kv \
	--classname com.datastax.oss.sink.pulsar.StringCassandraSinkTask \
	--sink-config-file conf/qs.yml \
	--sink-type cassandra-enhanced \
	--tenant public \
	--namespace default \
	--inputs "persistent://public/default/example_topic"
"Created successfully"

Send some messages to DSE:

bin/pulsar-client produce -k "Message 1" -m "Content 1" persistent://public/default/example_topic
bin/pulsar-client produce -k "Message 2" -m "Content 2" persistent://public/default/example_topic
bin/pulsar-client produce -k "Message 3" -m "Content 3" persistent://public/default/example_topic

Start cqlsh and view the messages in the pulsar_kv table:

cqlsh> SELECT * FROM pulsar_qs.pulsar_kv;

 key       | content
-----------+-----------
 Message 3 | Content 3
 Message 2 | Content 2
 Message 1 | Content 1

(3 rows)

Where to go from here…

Now that you’ve run through a simple end-to-end configuration, you can start experimenting with more complicated Pulsar mappings and DSE schemas. For more details, see the following topics:

Determining topic data structure Display messages to determine the data structure of the topic messages.
Mapping basic messages to table columns Create a topic-table map for Pulsar messages that only contain a key and value in each record.
Mapping a message that contain JSON fields For JSON fields, map individual fields in the structure to columns.
Mapping Avro messages Supports mapping individual fields from a Avro format field.
Extract Pulsar record header values Extract values from Pulsar record header and write to the database table.
Mapping messages to table that has a User Defined Type Write complex types directly into User-defined Types (UDT).
Mapping a topic to multiple tables Ingest a single topic into multiple tables using a single connector instance.
Multiple topics to multiple tables Ingest multiple topics and write to different tables using a single connector instance.
Selectively update maps and UDTs based on Pulsar fields Selectively update maps and UDTs based on Pulsar fields.
Provide CQL queries in mappings Provide CQL queries when new record arrives on the Pulsar topic.
The now() function in mappings You can use the now() function in mappings.

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