This project is used for flume-ng to communicate with sql databases
- After the last update the code has been integrated with hibernate, so all databases supported by this technology should work.
$ mvn package
Copy flume-ng-sql-source-.jar in target folder into flume plugins dir folder
$ mkdir -p $FLUME_HOME/plugins.d/sql-source/lib $FLUME_HOME/plugins.d/sql-source/libext
$ cp flume-ng-sql-source-0.8.jar $FLUME_HOME/plugins.d/sql-source/lib
Download the official mysql jdbc driver and copy in libext flume plugins directory:
$ wget https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-5.1.35.tar.gz
$ tar xzf mysql-connector-java-5.1.35.tar.gz
$ cp mysql-connector-java-5.1.35-bin.jar $FLUME_HOME/plugins.d/sql-source/libext
Download the official Microsoft 4.1 Sql Server jdbc driver and copy in libext flume plugins directory:
Download URL: https://www.microsoft.com/es-es/download/details.aspx?id=11774
$ tar xzf sqljdbc_4.1.5605.100_enu.tar.gz
$ cp sqljdbc_4.1/enu/sqljdbc41.jar $FLUME_HOME/plugins.d/sql-source/libext
Download the official IBM DB2 jdbc driver and copy in libext flume plugins directory: Download URL: http://www-01.ibm.com/support/docview.wss?uid=swg21363866
Mandatory properties in bold
| Property Name | Default | Description |
|---|---|---|
| channels | - | Connected channel names |
| type | - | The component type name, needs to be org.keedio.flume.source.SQLSource |
| hibernate.connection.url | - | Url to connect with the remote Database |
| hibernate.connection.user | - | Username to connect with the database |
| hibernate.connection.password | - | Password to connect with the database |
| table | - | Table to export data |
| status.file.name | - | Local file name to save last row number read |
| status.file.path | /var/lib/flume | Path to save the status file |
| start.from | 0 | Start value to import data |
| delimiter.entry | , | delimiter of incoming entry |
| enclose.by.quotes | true | If Quotes are applied to all values in the output. |
| columns.to.select | * | Which colums of the table will be selected |
| run.query.delay | 10000 | ms to wait between run queries |
| batch.size | 100 | Batch size to send events to flume channel |
| max.rows | 10000 | Max rows to import per query |
| read.only | false | Sets read only session with DDBB |
| custom.query | - | Custom query to force a special request to the DB, be carefull. Check below explanation of this property. |
| hibernate.connection.driver_class | - | Driver class to use by hibernate, if not specified the framework will auto asign one |
| hibernate.dialect | - | Dialect to use by hibernate, if not specified the framework will auto asign one. Check https://docs.jboss.org/hibernate/orm/4.3/manual/en-US/html/ch03.html#configuration-optional-dialects for a complete list of available dialects |
| hibernate.connection.provider_class | - | Set to org.hibernate.connection.C3P0ConnectionProvider to use C3P0 connection pool (recommended for production) |
| hibernate.c3p0.min_size | - | Min connection pool size |
| hibernate.c3p0.max_size | - | Max connection pool size |
| default.charset.resultset | UTF-8 | Result set from DB converted to charset character encoding |
If no custom query is set, SELECT <columns.to.select> FROM <table> will be executed each run.query.delay milliseconds configured
A custom query is supported to bring the possibility of using the entire SQL language. This is powerful, but risky, be careful with the custom queries used.
To avoid row export repetitions use the
IMPORTANT: For proper operation of Custom Query ensure that incremental field will be returned in the first position of the Query result.
Example:
agent.sources.sql-source.custom.query = SELECT incrementalField,field2 FROM table1 WHERE incrementalField > $@$
# For each one of the sources, the type is defined
agent.sources.sqlSource.type = org.keedio.flume.source.SQLSource
agent.sources.sqlSource.hibernate.connection.url = jdbc:db2://192.168.56.70:50000/sample
# Hibernate Database connection properties
agent.sources.sqlSource.hibernate.connection.user = db2inst1
agent.sources.sqlSource.hibernate.connection.password = db2inst1
agent.sources.sqlSource.hibernate.connection.autocommit = true
agent.sources.sqlSource.hibernate.dialect = org.hibernate.dialect.DB2Dialect
agent.sources.sqlSource.hibernate.connection.driver_class = com.ibm.db2.jcc.DB2Driver
#agent.sources.sqlSource.table = employee1
# Columns to import to kafka (default * import entire row)
#agent.sources.sqlSource.columns.to.select = *
# Query delay, each configured milisecond the query will be sent
agent.sources.sqlSource.run.query.delay=10000
# Status file is used to save last readed row
agent.sources.sqlSource.status.file.path = /var/log/flume
agent.sources.sqlSource.status.file.name = sqlSource.status
# Custom query
agent.sources.sqlSource.start.from = 19700101000000000000
agent.sources.sqlSource.custom.query = SELECT * FROM (select DECIMAL(test) * 1000000 AS INCREMENTAL, EMPLOYEE1.* from employee1 UNION select DECIMAL(test) * 1000000 AS INCREMENTAL, EMPLOYEE2.* from employee2) WHERE INCREMENTAL > $@$ ORDER BY INCREMENTAL ASC
agent.sources.sqlSource.batch.size = 1000
agent.sources.sqlSource.max.rows = 1000
agent.sources.sqlSource.delimiter.entry = |
agent.sources.sqlSource.hibernate.connection.provider_class = org.hibernate.connection.C3P0ConnectionProvider
agent.sources.sqlSource.hibernate.c3p0.min_size=1
agent.sources.sqlSource.hibernate.c3p0.max_size=10
# The channel can be defined as follows.
agent.sources.sqlSource.channels = memoryChannelAn issue with Java SQL Types and Hibernate Types could appear Using SQL Server databases and SQL Server Dialect coming with Hibernate.
Something like:
org.hibernate.MappingException: No Dialect mapping for JDBC type: -15
Use org.keedio.flume.source.SQLServerCustomDialect in flume configuration file to solve this problem.
I used flume-ng-kafka to guide me (https://github.com/baniuyao/flume-ng-kafka-source.git). Thanks to Frank Yao.
- Version 1.5.1 added charset encoding for result set is now configurable.
- Stable version is 1.5.0 (compatible with Apache Flume 1.8.0)
- Previous stable version is 1.4.3 (compatible with Apache Flume prior to 1.7.0)