Debezium source connector
The Debezium source connector pulls messages from MySQL or PostgreSQL and persists the messages to Pulsar topics.
Configurationβ
The configuration of Debezium source connector has the following properties.
Name | Required | Default | Description |
---|---|---|---|
task.class | true | null | A source task class that implemented in Debezium. |
database.hostname | true | null | The address of a database server. |
database.port | true | null | The port number of a database server. |
database.user | true | null | The name of a database user that has the required privileges. |
database.password | true | null | The password for a database user that has the required privileges. |
database.server.id | true | null | The connector βs identifier that must be unique within a database cluster and similar to the databaseβs server-id configuration property. |
database.server.name | true | null | The logical name of a database server/cluster, which forms a namespace and it is used in all the names of Kafka topics to which the connector writes, the Kafka Connect schema names, and the namespaces of the corresponding Avro schema when the Avro Connector is used. |
database.whitelist | false | null | A list of all databases hosted by this server which is monitored by the connector. This is optional, and there are other properties for listing databases and tables to include or exclude from monitoring. |
key.converter | true | null | The converter provided by Kafka Connect to convert record key. |
value.converter | true | null | The converter provided by Kafka Connect to convert record value. |
database.history | true | null | The name of the database history class. |
database.history.pulsar.topic | true | null | The name of the database history topic where the connector writes and recovers DDL statements. Note: this topic is for internal use only and should not be used by consumers. |
database.history.pulsar.service.url | true | null | Pulsar cluster service URL for history topic. |
pulsar.service.url | true | null | Pulsar cluster service URL. |
offset.storage.topic | true | null | Record the last committed offsets that the connector successfully completes. |
json-with-envelope | false | false | Present the message only consist of payload. |
Converter Optionsβ
- org.apache.kafka.connect.json.JsonConverter
This config json-with-envelope
is valid only for the JsonConverter. It's default value is false, the consumer use the schema Schema.KeyValue(Schema.AUTO_CONSUME(), Schema.AUTO_CONSUME(), KeyValueEncodingType.SEPARATED)
,
and the message only consist of payload.
If the config json-with-envelope
value is true, the consumer use the schema
Schema.KeyValue(Schema.BYTES, Schema.BYTES
, the message consist of schema and payload.
- org.apache.pulsar.kafka.shade.io.confluent.connect.avro.AvroConverter
If users select the AvroConverter, then the pulsar consumer should use the schema Schema.KeyValue(Schema.AUTO_CONSUME(), Schema.AUTO_CONSUME(), KeyValueEncodingType.SEPARATED)
, and the message consist of payload.
MongoDB Configurationβ
Name | Required | Default | Description |
---|---|---|---|
mongodb.hosts | true | null | The comma-separated list of hostname and port pairs (in the form 'host' or 'host:port') of the MongoDB servers in the replica set. The list contains a single hostname and a port pair. If mongodb.members.auto.discover is set to false, the host and port pair are prefixed with the replica set name (e.g., rs0/localhost:27017). |
mongodb.name | true | null | A unique name that identifies the connector and/or MongoDB replica set or shared cluster that this connector monitors. Each server should be monitored by at most one Debezium connector, since this server name prefixes all persisted Kafka topics emanating from the MongoDB replica set or cluster. |
mongodb.user | true | null | Name of the database user to be used when connecting to MongoDB. This is required only when MongoDB is configured to use authentication. |
mongodb.password | true | null | Password to be used when connecting to MongoDB. This is required only when MongoDB is configured to use authentication. |
mongodb.task.id | true | null | The taskId of the MongoDB connector that attempts to use a separate task for each replica set. |
Example of MySQLβ
You need to create a configuration file before using the Pulsar Debezium connector.
Configurationβ
You can use one of the following methods to create a configuration file.
-
JSON
{
"database.hostname": "localhost",
"database.port": "3306",
"database.user": "debezium",
"database.password": "dbz",
"database.server.id": "184054",
"database.server.name": "dbserver1",
"database.whitelist": "inventory",
"database.history": "org.apache.pulsar.io.debezium.PulsarDatabaseHistory",
"database.history.pulsar.topic": "history-topic",
"database.history.pulsar.service.url": "pulsar://127.0.0.1:6650",
"key.converter": "org.apache.kafka.connect.json.JsonConverter",
"value.converter": "org.apache.kafka.connect.json.JsonConverter",
"pulsar.service.url": "pulsar://127.0.0.1:6650",
"offset.storage.topic": "offset-topic"
} -
YAML
You can create a
debezium-mysql-source-config.yaml
file and copy the contents below to thedebezium-mysql-source-config.yaml
file.
tenant: "public"
namespace: "default"
name: "debezium-mysql-source"
topicName: "debezium-mysql-topic"
archive: "connectors/pulsar-io-debezium-mysql-2.7.5.nar"
parallelism: 1
configs:
## config for mysql, docker image: debezium/example-mysql:0.8
database.hostname: "localhost"
database.port: "3306"
database.user: "debezium"
database.password: "dbz"
database.server.id: "184054"
database.server.name: "dbserver1"
database.whitelist: "inventory"
database.history: "org.apache.pulsar.io.debezium.PulsarDatabaseHistory"
database.history.pulsar.topic: "history-topic"
database.history.pulsar.service.url: "pulsar://127.0.0.1:6650"
## KEY_CONVERTER_CLASS_CONFIG, VALUE_CONVERTER_CLASS_CONFIG
key.converter: "org.apache.kafka.connect.json.JsonConverter"
value.converter: "org.apache.kafka.connect.json.JsonConverter"
## PULSAR_SERVICE_URL_CONFIG
pulsar.service.url: "pulsar://127.0.0.1:6650"
## OFFSET_STORAGE_TOPIC_CONFIG
offset.storage.topic: "offset-topic"
Usageβ
This example shows how to change the data of a MySQL table using the Pulsar Debezium connector.
-
Start a MySQL server with a database from which Debezium can capture changes.
$ docker run -it --rm \
--name mysql \
-p 3306:3306 \
-e MYSQL_ROOT_PASSWORD=debezium \
-e MYSQL_USER=mysqluser \
-e MYSQL_PASSWORD=mysqlpw debezium/example-mysql:0.8 -
Start a Pulsar service locally in standalone mode.
$ bin/pulsar standalone -
Start the Pulsar Debezium connector in local run mode using one of the following methods.
-
Use the JSON configuration file as shown previously.
Make sure the nar file is available at
connectors/pulsar-io-debezium-mysql-2.7.5.nar
.
$ bin/pulsar-admin source localrun \
--archive connectors/pulsar-io-debezium-mysql-2.7.5.nar \
--name debezium-mysql-source --destination-topic-name debezium-mysql-topic \
--tenant public \
--namespace default \
--source-config '{"database.hostname": "localhost","database.port": "3306","database.user": "debezium","database.password": "dbz","database.server.id": "184054","database.server.name": "dbserver1","database.whitelist": "inventory","database.history": "org.apache.pulsar.io.debezium.PulsarDatabaseHistory","database.history.pulsar.topic": "history-topic","database.history.pulsar.service.url": "pulsar://127.0.0.1:6650","key.converter": "org.apache.kafka.connect.json.JsonConverter","value.converter": "org.apache.kafka.connect.json.JsonConverter","pulsar.service.url": "pulsar://127.0.0.1:6650","offset.storage.topic": "offset-topic"}' -
Use the YAML configuration file as shown previously.
$ bin/pulsar-admin source localrun \
--source-config-file debezium-mysql-source-config.yaml
-
-
Subscribe the topic sub-products for the table inventory.products.
$ bin/pulsar-client consume -s "sub-products" public/default/dbserver1.inventory.products -n 0 -
Start a MySQL client in docker.
$ docker run -it --rm \
--name mysqlterm \
--link mysql \
--rm mysql:5.7 sh \
-c 'exec mysql -h"$MYSQL_PORT_3306_TCP_ADDR" -P"$MYSQL_PORT_3306_TCP_PORT" -uroot -p"$MYSQL_ENV_MYSQL_ROOT_PASSWORD"' -
A MySQL client pops out.
Change the connection mode to
mysql_native_password
.mysql> show variables like "caching_sha2_password_auto_generate_rsa_keys";
+----------------------------------------------+-------+
| Variable_name | Value |
+----------------------------------------------+-------+
| caching_sha2_password_auto_generate_rsa_keys | ON |
+----------------------------------------------+-------+
# If the value of "caching_sha2_password_auto_generate_rsa_keys" is ON, ensure the plugin of mysql.user is "mysql_native_password".
mysql> SELECT Host, User, plugin from mysql.user where user={user};
+-----------+------+-----------------------+
| Host | User | plugin |
+-----------+------+-----------------------+
| localhost | root | caching_sha2_password |
+-----------+------+-----------------------+
# If the plugin of mysql.user is is "caching_sha2_password", set it to "mysql_native_password".
alter user '{user}'@'{host}' identified with mysql_native_password by {password};
# Check the plugin of mysql.user.
mysql> SELECT Host, User, plugin from mysql.user where user={user};
+-----------+------+-----------------------+
| Host | User | plugin |
+-----------+------+-----------------------+
| localhost | root | mysql_native_password |
+-----------+------+-----------------------+Use the following commands to change the data of the table products.
mysql> use inventory;
mysql> show tables;
mysql> SELECT * FROM products;
mysql> UPDATE products SET name='1111111111' WHERE id=101;
mysql> UPDATE products SET name='1111111111' WHERE id=107;In the terminal window of subscribing topic, you can find the data changes have been kept in the sub-products topic.
Example of PostgreSQLβ
You need to create a configuration file before using the Pulsar Debezium connector.
Configurationβ
You can use one of the following methods to create a configuration file.
-
JSON
{
"database.hostname": "localhost",
"database.port": "5432",
"database.user": "postgres",
"database.password": "changeme",
"database.dbname": "postgres",
"database.server.name": "dbserver1",
"plugin.name": "pgoutput",
"schema.whitelist": "public",
"table.whitelist": "public.users",
"pulsar.service.url": "pulsar://127.0.0.1:6650"
} -
YAML
You can create a
debezium-postgres-source-config.yaml
file and copy the contents below to thedebezium-postgres-source-config.yaml
file.
tenant: "public"
namespace: "default"
name: "debezium-postgres-source"
topicName: "debezium-postgres-topic"
archive: "connectors/pulsar-io-debezium-postgres-2.7.5.nar"
parallelism: 1
configs:
## config for postgres version 10+, official docker image: postgres:<10+>
database.hostname: "localhost"
database.port: "5432"
database.user: "postgres"
database.password: "changeme"
database.dbname: "postgres"
database.server.name: "dbserver1"
plugin.name: "pgoutput"
schema.whitelist: "public"
table.whitelist: "public.users"
## PULSAR_SERVICE_URL_CONFIG
pulsar.service.url: "pulsar://127.0.0.1:6650"
Notice that pgoutput
is a standard plugin of Postgres introduced in version 10 - see Postgres architecture docu. You don't need to install anything, just make sure the WAL level is set to logical
(see docker command below and Postgres docu).
Usageβ
This example shows how to change the data of a PostgreSQL table using the Pulsar Debezium connector.
-
Start a PostgreSQL server with a database from which Debezium can capture changes.
$ docker run -d -it --rm \
--name pulsar-postgres \
-p 5432:5432 \
-e POSTGRES_PASSWORD=changeme \
postgres:13.3 -c wal_level=logical -
Start a Pulsar service locally in standalone mode.
$ bin/pulsar standalone -
Start the Pulsar Debezium connector in local run mode using one of the following methods.
- Use the JSON configuration file as shown previously.
Make sure the nar file is available at
connectors/pulsar-io-debezium-postgres-2.7.5.nar
.
$ bin/pulsar-admin source localrun \
--archive connectors/pulsar-io-debezium-postgres-2.7.5.nar \
--name debezium-postgres-source \
--destination-topic-name debezium-postgres-topic \
--tenant public \
--namespace default \
--source-config '{"database.hostname": "localhost","database.port": "5432","database.user": "postgres","database.password": "changeme","database.dbname": "postgres","database.server.name": "dbserver1","plugin.name": "pgoutput","schema.whitelist": "public","table.whitelist": "public.users","pulsar.service.url": "pulsar://127.0.0.1:6650"}'-
Use the YAML configuration file as shown previously.
$ bin/pulsar-admin source localrun \
--source-config-file debezium-postgres-source-config.yaml
-
Subscribe the topic sub-users for the public.users table.
$ bin/pulsar-client consume -s "sub-users" public/default/dbserver1.public.users -n 0 -
Start a PostgreSQL client in docker.
$ docker exec -it pulsar-postgresql /bin/bash -
A PostgreSQL client pops out.
Use the following commands to create sample data in the table users.
psql -U postgres -h localhost -p 5432
Password for user postgres:
CREATE TABLE users(
id BIGINT GENERATED ALWAYS AS IDENTITY, PRIMARY KEY(id),
hash_firstname TEXT NOT NULL,
hash_lastname TEXT NOT NULL,
gender VARCHAR(6) NOT NULL CHECK (gender IN ('male', 'female'))
);
INSERT INTO users(hash_firstname, hash_lastname, gender)
SELECT md5(RANDOM()::TEXT), md5(RANDOM()::TEXT), CASE WHEN RANDOM() < 0.5 THEN 'male' ELSE 'female' END FROM generate_series(1, 100);
postgres=# select * from users;
id | hash_firstname | hash_lastname | gender
-------+----------------------------------+----------------------------------+--------
1 | 02bf7880eb489edc624ba637f5ab42bd | 3e742c2cc4217d8e3382cc251415b2fb | female
2 | dd07064326bb9119189032316158f064 | 9c0e938f9eddbd5200ba348965afbc61 | male
3 | 2c5316fdd9d6595c1cceb70eed12e80c | 8a93d7d8f9d76acfaaa625c82a03ea8b | female
4 | 3dfa3b4f70d8cd2155567210e5043d2b | 32c156bc28f7f03ab5d28e2588a3dc19 | female
postgres=# UPDATE users SET hash_firstname='maxim' WHERE id=1;
UPDATE 1In the terminal window of subscribing topic, you can receive the following messages.
----- got message -----
{"before":null,"after":{"id":1,"hash_firstname":"maxim","hash_lastname":"292113d30a3ccee0e19733dd7f88b258","gender":"male"},"source:{"version":"1.0.0.Final","connector":"postgresql","name":"foobar","ts_ms":1624045862644,"snapshot":"false","db":"postgres","schema":"public","table":"users","txId":595,"lsn":24419784,"xmin":null},"op":"u","ts_ms":1624045862648}
...many more
Example of MongoDBβ
You need to create a configuration file before using the Pulsar Debezium connector.
-
JSON
{
"mongodb.hosts": "rs0/mongodb:27017",
"mongodb.name": "dbserver1",
"mongodb.user": "debezium",
"mongodb.password": "dbz",
"mongodb.task.id": "1",
"database.whitelist": "inventory",
"pulsar.service.url": "pulsar://127.0.0.1:6650"
} -
YAML
You can create a
debezium-mongodb-source-config.yaml
file and copy the contents below to thedebezium-mongodb-source-config.yaml
file.
tenant: "public"
namespace: "default"
name: "debezium-mongodb-source"
topicName: "debezium-mongodb-topic"
archive: "connectors/pulsar-io-debezium-mongodb-2.7.5.nar"
parallelism: 1
configs:
## config for pg, docker image: debezium/example-mongodb:0.10
mongodb.hosts: "rs0/mongodb:27017",
mongodb.name: "dbserver1",
mongodb.user: "debezium",
mongodb.password: "dbz",
mongodb.task.id: "1",
database.whitelist: "inventory",
## PULSAR_SERVICE_URL_CONFIG
pulsar.service.url: "pulsar://127.0.0.1:6650"
Usageβ
This example shows how to change the data of a MongoDB table using the Pulsar Debezium connector.
-
Start a MongoDB server with a database from which Debezium can capture changes.
$ docker pull debezium/example-mongodb:0.10
$ docker run -d -it --rm --name pulsar-mongodb -e MONGODB_USER=mongodb -e MONGODB_PASSWORD=mongodb -p 27017:27017 debezium/example-mongodb:0.10Use the following commands to initialize the data.
./usr/local/bin/init-inventory.shIf the local host cannot access the container network, you can update the file
/etc/hosts
and add a rule127.0.0.1 6 f114527a95f
. f114527a95f is container id, you can try to get bydocker ps -a
-
Start a Pulsar service locally in standalone mode.
$ bin/pulsar standalone -
Start the Pulsar Debezium connector in local run mode using one of the following methods.
- Use the JSON configuration file as shown previously.
Make sure the nar file is available at
connectors/pulsar-io-mongodb-2.7.5.nar
.
$ bin/pulsar-admin source localrun \
--archive connectors/pulsar-io-debezium-mongodb-2.7.5.nar \
--name debezium-mongodb-source \
--destination-topic-name debezium-mongodb-topic \
--tenant public \
--namespace default \
--source-config '{"mongodb.hosts": "rs0/mongodb:27017","mongodb.name": "dbserver1","mongodb.user": "debezium","mongodb.password": "dbz","mongodb.task.id": "1","database.whitelist": "inventory","pulsar.service.url": "pulsar://127.0.0.1:6650"}'-
Use the YAML configuration file as shown previously.
$ bin/pulsar-admin source localrun \
--source-config-file debezium-mongodb-source-config.yaml
-
Subscribe the topic sub-products for the inventory.products table.
$ bin/pulsar-client consume -s "sub-products" public/default/dbserver1.inventory.products -n 0 -
Start a MongoDB client in docker.
$ docker exec -it pulsar-mongodb /bin/bash -
A MongoDB client pops out.
mongo -u debezium -p dbz --authenticationDatabase admin localhost:27017/inventory
db.products.update({"_id":NumberLong(104)},{$set:{weight:1.25}})In the terminal window of subscribing topic, you can receive the following messages.
----- got message -----
{"schema":{"type":"struct","fields":[{"type":"string","optional":false,"field":"id"}],"optional":false,"name":"dbserver1.inventory.products.Key"},"payload":{"id":"104"}}, value = {"schema":{"type":"struct","fields":[{"type":"string","optional":true,"name":"io.debezium.data.Json","version":1,"field":"after"},{"type":"string","optional":true,"name":"io.debezium.data.Json","version":1,"field":"patch"},{"type":"struct","fields":[{"type":"string","optional":false,"field":"version"},{"type":"string","optional":false,"field":"connector"},{"type":"string","optional":false,"field":"name"},{"type":"int64","optional":false,"field":"ts_ms"},{"type":"string","optional":true,"name":"io.debezium.data.Enum","version":1,"parameters":{"allowed":"true,last,false"},"default":"false","field":"snapshot"},{"type":"string","optional":false,"field":"db"},{"type":"string","optional":false,"field":"rs"},{"type":"string","optional":false,"field":"collection"},{"type":"int32","optional":false,"field":"ord"},{"type":"int64","optional":true,"field":"h"}],"optional":false,"name":"io.debezium.connector.mongo.Source","field":"source"},{"type":"string","optional":true,"field":"op"},{"type":"int64","optional":true,"field":"ts_ms"}],"optional":false,"name":"dbserver1.inventory.products.Envelope"},"payload":{"after":"{\"_id\": {\"$numberLong\": \"104\"},\"name\": \"hammer\",\"description\": \"12oz carpenter's hammer\",\"weight\": 1.25,\"quantity\": 4}","patch":null,"source":{"version":"0.10.0.Final","connector":"mongodb","name":"dbserver1","ts_ms":1573541905000,"snapshot":"true","db":"inventory","rs":"rs0","collection":"products","ord":1,"h":4983083486544392763},"op":"r","ts_ms":1573541909761}}.
FAQβ
Debezium postgres connector will hang when create snapβ
#18 prio=5 os_prio=31 tid=0x00007fd83096f800 nid=0xa403 waiting on condition [0x000070000f534000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000007ab025a58> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.LinkedBlockingDeque.putLast(LinkedBlockingDeque.java:396)
at java.util.concurrent.LinkedBlockingDeque.put(LinkedBlockingDeque.java:649)
at io.debezium.connector.base.ChangeEventQueue.enqueue(ChangeEventQueue.java:132)
at io.debezium.connector.postgresql.PostgresConnectorTask$Lambda$203/385424085.accept(Unknown Source)
at io.debezium.connector.postgresql.RecordsSnapshotProducer.sendCurrentRecord(RecordsSnapshotProducer.java:402)
at io.debezium.connector.postgresql.RecordsSnapshotProducer.readTable(RecordsSnapshotProducer.java:321)
at io.debezium.connector.postgresql.RecordsSnapshotProducer.lambda$takeSnapshot$6(RecordsSnapshotProducer.java:226)
at io.debezium.connector.postgresql.RecordsSnapshotProducer$Lambda$240/1347039967.accept(Unknown Source)
at io.debezium.jdbc.JdbcConnection.queryWithBlockingConsumer(JdbcConnection.java:535)
at io.debezium.connector.postgresql.RecordsSnapshotProducer.takeSnapshot(RecordsSnapshotProducer.java:224)
at io.debezium.connector.postgresql.RecordsSnapshotProducer.lambda$start$0(RecordsSnapshotProducer.java:87)
at io.debezium.connector.postgresql.RecordsSnapshotProducer$Lambda$206/589332928.run(Unknown Source)
at java.util.concurrent.CompletableFuture.uniRun(CompletableFuture.java:705)
at java.util.concurrent.CompletableFuture.uniRunStage(CompletableFuture.java:717)
at java.util.concurrent.CompletableFuture.thenRun(CompletableFuture.java:2010)
at io.debezium.connector.postgresql.RecordsSnapshotProducer.start(RecordsSnapshotProducer.java:87)
at io.debezium.connector.postgresql.PostgresConnectorTask.start(PostgresConnectorTask.java:126)
at io.debezium.connector.common.BaseSourceTask.start(BaseSourceTask.java:47)
at org.apache.pulsar.io.kafka.connect.KafkaConnectSource.open(KafkaConnectSource.java:127)
at org.apache.pulsar.io.debezium.DebeziumSource.open(DebeziumSource.java:100)
at org.apache.pulsar.functions.instance.JavaInstanceRunnable.setupInput(JavaInstanceRunnable.java:690)
at org.apache.pulsar.functions.instance.JavaInstanceRunnable.setupJavaInstance(JavaInstanceRunnable.java:200)
at org.apache.pulsar.functions.instance.JavaInstanceRunnable.run(JavaInstanceRunnable.java:230)
at java.lang.Thread.run(Thread.java:748)
If you encounter the above problems in synchronizing data, please refer to this and add the following configuration to the configuration file:
max.queue.size=