{"id":19053787,"url":"https://github.com/siddhi-io/siddhi-io-cdc","last_synced_at":"2025-04-05T02:09:27.078Z","repository":{"id":33364413,"uuid":"153104854","full_name":"siddhi-io/siddhi-io-cdc","owner":"siddhi-io","description":"Extension which consumes CDC 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IO CDC\n===================\n\n  [![Jenkins Build Status](https://wso2.org/jenkins/job/siddhi/job/siddhi-io-cdc/badge/icon)](https://wso2.org/jenkins/job/siddhi/job/siddhi-io-cdc/)\n  [![GitHub Release](https://img.shields.io/github/release/siddhi-io/siddhi-io-cdc.svg)](https://github.com/siddhi-io/siddhi-io-cdc/releases)\n  [![GitHub Release Date](https://img.shields.io/github/release-date/siddhi-io/siddhi-io-cdc.svg)](https://github.com/siddhi-io/siddhi-io-cdc/releases)\n  [![GitHub Open Issues](https://img.shields.io/github/issues-raw/siddhi-io/siddhi-io-cdc.svg)](https://github.com/siddhi-io/siddhi-io-cdc/issues)\n  [![GitHub Last Commit](https://img.shields.io/github/last-commit/siddhi-io/siddhi-io-cdc.svg)](https://github.com/siddhi-io/siddhi-io-cdc/commits/master)\n  [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)\n\nThe **siddhi-io-cdc extension** is an extension to \u003ca target=\"_blank\" href=\"https://wso2.github.io/siddhi\"\u003eSiddhi\u003c/a\u003e that captures change data from databases such as MySQL, MS SQL, PostgreSQL, H2 and Oracle.\n\nFor information on \u003ca target=\"_blank\" href=\"https://siddhi.io/\"\u003eSiddhi\u003c/a\u003e and it's features refer \u003ca target=\"_blank\" href=\"https://siddhi.io/redirect/docs.html\"\u003eSiddhi Documentation\u003c/a\u003e. \n\n## Download\n\n* Versions 3.x and above with group id `io.siddhi.extension.*` from \u003ca target=\"_blank\" href=\"https://mvnrepository.com/artifact/io.siddhi.extension.io.cdc/siddhi-io-cdc/\"\u003ehere\u003c/a\u003e.\n* Versions 2.x and lower with group id `org.wso2.extension.siddhi.*` from \u003ca target=\"_blank\" href=\"https://mvnrepository.com/artifact/org.wso2.extension.siddhi.io.cdc/siddhi-io-cdc\"\u003ehere\u003c/a\u003e.\n\n## Latest API Docs \n\nLatest API Docs is \u003ca target=\"_blank\" href=\"https://siddhi-io.github.io/siddhi-io-cdc/api/2.0.17\"\u003e2.0.17\u003c/a\u003e.\n\n## Features\n\n* \u003ca target=\"_blank\" href=\"https://siddhi-io.github.io/siddhi-io-cdc/api/2.0.17/#cdc-source\"\u003ecdc\u003c/a\u003e *(\u003ca target=\"_blank\" href=\"http://siddhi.io/en/v5.1/docs/query-guide/#source\"\u003eSource\u003c/a\u003e)*\u003cbr\u003e \u003cdiv style=\"padding-left: 1em;\"\u003e\u003cp\u003e\u003cp style=\"word-wrap: break-word;margin: 0;\"\u003eThe CDC source receives events when change events (i.e., INSERT, UPDATE, DELETE) are triggered for a database table. Events are received in the 'key-value' format.\u003cbr\u003e\u003cbr\u003eThere are two modes you could perform CDC: Listening mode and Polling mode.\u003cbr\u003e\u003cbr\u003eIn polling mode, the datasource is periodically polled for capturing the changes. The polling period can be configured.\u003cbr\u003eIn polling mode, you can only capture INSERT and UPDATE changes.\u003cbr\u003e\u003cbr\u003eOn listening mode, the Source will keep listening to the Change Log of the database and notify in case a change has taken place. Here, you are immediately notified about the change, compared to polling mode.\u003cbr\u003e\u003cbr\u003eThe key values of the map of a CDC change event are as follows.\u003cbr\u003e\u003cbr\u003eFor 'listening' mode: \u003cbr\u003e\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;For insert: Keys are specified as columns of the table.\u003cbr\u003e\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;For delete: Keys are followed by the specified table columns. This is achieved via 'before_'. e.g., specifying 'before_X' results in the key being added before the column named 'X'.\u003cbr\u003e\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;For update: Keys are followed followed by the specified table columns. This is achieved via 'before_'. e.g., specifying 'before_X' results in the key being added before the column named 'X'.\u003cbr\u003e\u003cbr\u003eFor 'polling' mode: Keys are specified as the columns of the table.In order to connect in to the database table for receive CDC events, url, username, password and driverClassName(in polling mode) can be provided in deployment.yaml file under the siddhi namespace as below,  \u003c/p\u003e\u003cpre\u003e\n  siddhi:\n    extensions:\n      -\n        extension:\n          name: 'cdc'\n          namespace: 'source'\n          properties:\n            url: jdbc:sqlserver://localhost:1433;databaseName=CDC_DATA_STORE\n            password: \u0026lt;password\u0026gt;\n            username: \u0026lt;\u0026gt;\n            driverClassName: com.microsoft.sqlserver.jdbc.SQLServerDriver  \u003c/pre\u003e\u003cp style=\"word-wrap: break-word;margin: 0;\"\u003e\u003cbr\u003e\u003cbr\u003e***Preparations required for working with Oracle Databases in listening mode***\u003cbr\u003e\u003cbr\u003eUsing the extension in Windows, Mac OSX and AIX are pretty straight forward inorder to achieve the required behaviour please follow the steps given below\u003cbr\u003e\u003cbr\u003e\u0026nbsp;\u0026nbsp;- Download the compatible version of oracle instantclient for the database version from [here](https://www.oracle.com/database/technologies/instant-client/downloads.html) and extract\u003cbr\u003e\u0026nbsp;\u0026nbsp;- Extract and set the environment variable \u003ccode\u003eLD_LIBRARY_PATH\u003c/code\u003e to the location of instantclient which was exstracted as shown below\u003cbr\u003e\u0026nbsp;\u0026nbsp;\u003c/p\u003e\u003cpre\u003e\n    export LD_LIBRARY_PATH=\u0026lt;path to the instant client location\u0026gt;\n  \u003c/pre\u003e\u003cp style=\"word-wrap: break-word;margin: 0;\"\u003e\u003cbr\u003e\u0026nbsp;\u0026nbsp;- Inside the instantclient folder which was download there are two jars \u003ccode\u003exstreams.jar\u003c/code\u003e and \u003ccode\u003eojdbc\u0026lt;version\u0026gt;.jar\u003c/code\u003e convert them to OSGi bundles using the tools which were provided in the \u003ccode\u003e\u0026lt;distribution\u0026gt;/bin\u003c/code\u003e for converting the \u003ccode\u003eojdbc.jar\u003c/code\u003e use the tool \u003ccode\u003espi-provider.sh|bat\u003c/code\u003e and for the conversion of \u003ccode\u003exstreams.jar\u003c/code\u003e use the jni-provider.sh as shown below(Note: this way of converting Xstreams jar is applicable only for Linux environments for other OSs this step is not required and converting it through the \u003ccode\u003ejartobundle.sh\u003c/code\u003e tool is enough)\u003cbr\u003e\u0026nbsp;\u0026nbsp;\u003c/p\u003e\u003cpre\u003e\n    ./jni-provider.sh \u0026lt;input-jar\u0026gt; \u0026lt;destination\u0026gt; \u0026lt;comma seperated native library names\u0026gt;\n  \u003c/pre\u003e\u003cp style=\"word-wrap: break-word;margin: 0;\"\u003e\u003cbr\u003e\u0026nbsp;\u0026nbsp;once ojdbc and xstreams jars are converted to OSGi copy the generated jars to the \u003ccode\u003e\u0026lt;distribution\u0026gt;/lib\u003c/code\u003e. Currently siddhi-io-cdc only supports the oracle database distributions 12 and above\u003cbr\u003e\u003cbr\u003e*** Configurations for PostgreSQL***\u003cbr\u003eWhen using listening mode with PostgreSQL, following properties has to be configured accordingly to create the connection.\u003cbr\u003e\u003cbr\u003e\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;***slot.name***: (default value = debezium) in postgreSQL only one connection can be created from single slot, so to create multiple connection custom slot.name should be provided.\u003cbr\u003e\u0026nbsp;\u003cbr\u003e\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;***plugin.name***: (default value = decoderbufs ) Logical decoding output plugin name which the database is configured with. Other supported values are pgoutput, decoderbufs, wal2json.\u003cbr\u003e\u003cbr\u003e\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;***table.name***: table name should be provided as \u0026lt;schema_name\u0026gt;.\u0026lt;table_name\u0026gt;. As an example, public.customer \u003cbr\u003e\u003cbr\u003e\u003cbr\u003eSee parameter: mode for supported databases and change events.\u003c/p\u003e\u003c/p\u003e\u003c/div\u003e\n\n## Dependencies \nJDBC connector jar should be added to the runtime. Download the JDBC connector jar based on the database type that is being used.\n\nTo identify the required JDBC connector jar, please refer to this debezium release \u003ca href=\"https://debezium.io/releases/1.9/\"\u003edocumentation\u003c/a\u003e  \n\nIn addition to that, there are some prerequisites that need to be met based on the CDC mode used. Please find them below.\n\n**Default mode (Listening mode):**\n\nCurrently MySQL, PostgreSQL and SQLServer are supported in Listening Mode.\nTo capture the change events, databases have to be configured as shown below.\n\n* MySQL - https://debezium.io/documentation/reference/connectors/mysql.html#setup-the-mysql-server\n* PostgreSQL - https://debezium.io/docs/connectors/postgresql/#setting-up-PostgreSQL\n* SQLServer - https://debezium.io/docs/connectors/sqlserver/#setting-up-sqlserver\n\n**Polling mode:**\n\n* Change data capturing table should be have a polling column. Auto Incremental column or Timestamp can be used.\n\nPlease see API docs for more details about change data capturing modes.\n\n## Installation\n\nFor installing this extension on various siddhi execution environments refer Siddhi documentation section on \u003ca target=\"_blank\" href=\"https://siddhi.io/redirect/add-extensions.html\"\u003eadding extensions\u003c/a\u003e.\n\n## Running Integration tests in docker containers(Optional)\n\nThe CDC functionality are tested with the docker base integration test framework.\nThe test framework initialize a docker container with required configuration before execute the test suit.\n\n**Start integration tests**\n\n 1. Install and run docker\n\n 2. To run the integration tests, navigate to the siddhi-io-cdc/ directory and issue the following commands.\n\n    * H2 default:\n\n            mvn clean install\n\n    * MySQL 5.7:\n\n             mvn verify -P local-mysql -Dskip.surefire.test=true\n\n    * Postgres 9.6:\n\n             mvn verify -P local-postgres -Dskip.surefire.test=true\n\n    * MSSQL:\n\n             mvn verify -P local-mssql -Dskip.surefire.test=true\n\n    * Oracle 11.2.0.2-xe:\n\n             mvn verify -P local-oracle -Dskip.surefire.test=true\n\n## Support and Contribution\n\n* We encourage users to ask questions and get support via \u003ca target=\"_blank\" href=\"https://stackoverflow.com/questions/tagged/siddhi\"\u003eStackOverflow\u003c/a\u003e, make sure to add the `siddhi` tag to the issue for better response.\n\n* If you find any issues related to the extension please report them on \u003ca target=\"_blank\" href=\"https://github.com/siddhi-io/siddhi-execution-string/issues\"\u003ethe issue tracker\u003c/a\u003e.\n\n* For production support and other contribution related information refer \u003ca target=\"_blank\" href=\"https://siddhi.io/community/\"\u003eSiddhi Community\u003c/a\u003e documentation.\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsiddhi-io%2Fsiddhi-io-cdc","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fsiddhi-io%2Fsiddhi-io-cdc","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsiddhi-io%2Fsiddhi-io-cdc/lists"}