git clone https://github.com/saubury/kafka-connect-oracle-cdc
cd kafka-connect-oracle-cdc
Be sure to review license at https://www.confluent.io/hub/confluentinc/kafka-connect-oracle-cdc and download the zip file.
Unzip to confluentinc-kafka-connect-oracle-cdc (and remove any trailing version numbers)
unzip ~/Downloads/confluentinc-kafka-connect-oracle-cdc-1.0.3.zip
mv confluentinc-kafka-connect-oracle-cdc-1.0.3 confluentinc-kafka-connect-oracle-cdc
From Stackoverflow ...
- log into https://hub.docker.com/
- search "oracle database"
- click on "Oracle Database Enterprise Edition"
- click on "Proceed to Checkout"
- fill in your contact info on the left, check two boxes under "Developer Tier" on the right, click on "Get Content"
docker login --username YourDockerUserName --password-stdin
<<Enter your password>>
docker pull store/oracle/database-enterprise:12.2.0.1
- Install docker/docker-compose
- Set your Docker maximum memory to something really big, such as 10GB. (preferences -> advanced -> memory)
- Startup the platform (Oracle, Kafka, Kafka Connect, Schema registry)
docker-compose up -d
Once the Oracle database is running, we need to turn on ARCHIVELOG mode, create some users, and establish permissions
First, ensure the database looks like it's running (docker-compose logs -f oracle) and then run the following (for the curious, the SQL script is here )
docker-compose exec oracle /scripts/go_sqlplus.sh /scripts/oracle_setup_docker
This SQL script also creates an EMP table, and adds four employees.
| I (primary key) | Name |
|---|---|
| 1 | Bob |
| 2 | Jane |
| 3 | Mary |
| 4 | Alice |
Optional, but it's a good idea to create the topics
kafka-topics --bootstrap-server localhost:9092 --create --partitions 1 --replication-factor 1 --topic ORCLCDB.C__MYUSER.EMP
kafka-topics --bootstrap-server localhost:9092 --create --partitions 1 --replication-factor 1 --topic SimpleOracleCDC-ORCLCDB-redo-log
Check the OracleCdcSourceConnector source plug-in is available
curl -s -X GET -H 'Content-Type: application/json' http://localhost:8083/connector-plugins | jq '.'
And look for an occurrence of "class": "io.confluent.connect.oracle.cdc.OracleCdcSourceConnector"
Establish the SimpleOracleCDC connector
curl -s -X POST -H 'Content-Type: application/json' --data @SimpleOracleCDC.json http://localhost:8083/connectors | jq
Check the status of the connector. You may need to wait a while for the status to show up
curl -s -X GET -H 'Content-Type: application/json' http://localhost:8083/connectors/SimpleOracleCDC/status | jq
If you have Kafka tools installed locally, you can look at the de-serialised AVRO like this
kafka-avro-console-consumer --bootstrap-server localhost:9092 --topic ORCLCDB.C__MYUSER.EMP --from-beginning
Or if you don't have the Kafka tools installed, you can launch them via a container like
docker-compose exec kafka-connect kafka-avro-console-consumer --bootstrap-server kafka:29092 --property schema.registry.url="http://schema-registry:8081" --topic ORCLCDB.C__MYUSER.EMP --from-beginning
The (simplified) output of kafka-avro-console-consumer should look something like
{"I":"\u0001","NAME":{"string":"Bob"}}
{"I":"\u0002","NAME":{"string":"Jane"}}
{"I":"\u0003","NAME":{"string":"Mary"}}
{"I":"\u0004","NAME":{"string":"Alice"}}
Let's see what schemas we have registered now
curl -s -X GET http://localhost:8081/subjects/ORCLCDB.C__MYUSER.EMP-value/versions/1 | jq -r .schema | jq .Amongst other things, you'll see version 1 of the schema has been registered like this
"fields": [
{
"name": "I",
"type": {
"type": "bytes"
},
{
"name": "NAME",
"type": [
"string"
]
}
Run docker-compose exec oracle /scripts/go_sqlplus.sh followed by this SQL
insert into C##MYUSER.emp (name) values ('Dale');
insert into C##MYUSER.emp (name) values ('Emma');
update C##MYUSER.emp set name = 'Robert' where name = 'Bob';
delete C##MYUSER.emp where name = 'Jane';
commit;
exit
This adds 2 rows to EMP table, updates 1 row, and deletes 1 row.
| I (primary key) | Name |
|---|---|
| 1 | Bob --> Robert |
| 2 | Jane (deleted) |
| 3 | Mary |
| 4 | Alice |
| 5 | Dale |
| 6 | Emma |
The (simplified) output of kafka-avro-console-consumer should look something like
{"I":"\u0005","NAME":{"string":"Dale"},"op_type":{"string":"I"}}
{"I":"\u0006","NAME":{"string":"Emma"},"op_type":{"string":"I"}}
{"I":"\u0001","NAME":{"string":"Robert"},"op_type":{"string":"U"}}
{"I":"\u0002","NAME":{"string":"Jane"},"op_type":{"string":"D"}
Run docker-compose exec oracle /scripts/go_sqlplus.sh followed by this SQL
ALTER TABLE C##MYUSER.EMP ADD (SURNAME VARCHAR2(100));
insert into C##MYUSER.emp (name, surname) values ('Mickey', 'Mouse');
commit;
Our new row looks like this (note the new surname column)
| I (primary key) | Name | Surname |
|---|---|---|
| 7 | Mickey | Mouse |
Let's see what schemas we have registered now. We have data registered against version 1 and version 2 of the schema
curl -s -X GET http://localhost:8081/subjects/ORCLCDB.C__MYUSER.EMP-value/versions
curl -s -X GET http://localhost:8081/subjects/ORCLCDB.C__MYUSER.EMP-value/versions/1 | jq '.'
curl -s -X GET http://localhost:8081/subjects/ORCLCDB.C__MYUSER.EMP-value/versions/2 | jq '.'
or you can also use:
curl -s -X GET http://localhost:8081/subjects/ORCLCDB.C__MYUSER.EMP-value/versions/2 | jq -r .schema | jq .Note, schema version 2 has this addition
{
"name": "SURNAME",
"type": [
"null",
"string"
],
"default": null
}
If something goes wrong, you can delete the connector like this
curl -X DELETE localhost:8083/connectors/SimpleOracleCDC
To tear down the containers
docker-compose down
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