Schema Evolution means that the schema of a data table can be changed and the data synchronization task can automatically adapt to the changes of the new table structure without any other operations.
ADD COLUMNDROP COLUMNRENAME COLUMNMODIFY COLUMNJdbc-Mysql Jdbc-Oracle Jdbc-Postgres Jdbc-Dameng Jdbc-SqlServer StarRocks Doris Paimon Elasticsearch
Note:
The schema evolution is not support the transform at now. The schema evolution of different types of databases（Oracle-CDC -> Jdbc-Mysql）is currently not supported the default value of the column in ddl.
When you use the Oracle-CDC，you can not use the username named SYS or SYSTEM to modify the table schema, otherwise the ddl event will be filtered out which can lead to the schema evolution not working. Otherwise, If your table name start with ORA_TEMP_ will also has the same problem.
Earlier versions of Dameng databases do not support the change of Varchar type fields to Text type fields.
Schema evolution is disabled by default in CDC source. You need configure schema-changes.enabled = true which is only supported in CDC to enable it.
env {
# You can set engine configuration here
parallelism = 5
job.mode = "STREAMING"
checkpoint.interval = 5000
read_limit.bytes_per_second=7000000
read_limit.rows_per_second=400
}
source {
MySQL-CDC {
server-id = 5652-5657
username = "st_user_source"
password = "mysqlpw"
table-names = ["shop.products"]
url = "jdbc:mysql://mysql_cdc_e2e:3306/shop"
schema-changes.enabled = true
}
}
sink {
jdbc {
url = "jdbc:mysql://mysql_cdc_e2e:3306/shop"
driver = "com.mysql.cj.jdbc.Driver"
user = "st_user_sink"
password = "mysqlpw"
generate_sink_sql = true
database = shop
table = mysql_cdc_e2e_sink_table_with_schema_change_exactly_once
primary_keys = ["id"]
is_exactly_once = true
xa_data_source_class_name = "com.mysql.cj.jdbc.MysqlXADataSource"
}
}
env {
# You can set engine configuration here
parallelism = 1
job.mode = "STREAMING"
checkpoint.interval = 5000
}
source {
# This is a example source plugin **only for test and demonstrate the feature source plugin**
Oracle-CDC {
plugin_output = "customers"
username = "dbzuser"
password = "dbz"
database-names = ["ORCLCDB"]
schema-names = ["DEBEZIUM"]
table-names = ["ORCLCDB.DEBEZIUM.FULL_TYPES"]
url = "jdbc:oracle:thin:@oracle-host:1521/ORCLCDB"
source.reader.close.timeout = 120000
connection.pool.size = 1
schema-changes.enabled = true
}
}
sink {
Jdbc {
plugin_input = "customers"
driver = "oracle.jdbc.driver.OracleDriver"
url = "jdbc:oracle:thin:@oracle-host:1521/ORCLCDB"
user = "dbzuser"
password = "dbz"
generate_sink_sql = true
database = "ORCLCDB"
table = "DEBEZIUM.FULL_TYPES_SINK"
batch_size = 1
primary_keys = ["ID"]
connection.pool.size = 1
}
}
env {
# You can set engine configuration here
parallelism = 1
job.mode = "STREAMING"
checkpoint.interval = 5000
}
source {
# This is a example source plugin **only for test and demonstrate the feature source plugin**
Oracle-CDC {
plugin_output = "customers"
username = "dbzuser"
password = "dbz"
database-names = ["ORCLCDB"]
schema-names = ["DEBEZIUM"]
table-names = ["ORCLCDB.DEBEZIUM.FULL_TYPES"]
url = "jdbc:oracle:thin:@oracle-host:1521/ORCLCDB"
source.reader.close.timeout = 120000
connection.pool.size = 1
schema-changes.enabled = true
}
}
sink {
jdbc {
plugin_input = "customers"
url = "jdbc:mysql://oracle-host:3306/oracle_sink"
driver = "com.mysql.cj.jdbc.Driver"
user = "st_user_sink"
password = "mysqlpw"
generate_sink_sql = true
# You need to configure both database and table
database = oracle_sink
table = oracle_cdc_2_mysql_sink_table
primary_keys = ["ID"]
}
}
env {
# You can set engine configuration here
parallelism = 1
job.mode = "STREAMING"
checkpoint.interval = 5000
}
source {
MySQL-CDC {
username = "st_user_source"
password = "mysqlpw"
table-names = ["shop.products"]
url = "jdbc:mysql://mysql_cdc_e2e:3306/shop"
schema-changes.enabled = true
}
}
sink {
StarRocks {
nodeUrls = ["starrocks_cdc_e2e:8030"]
username = "root"
password = ""
database = "shop"
table = "${table_name}"
base-url = "jdbc:mysql://starrocks_cdc_e2e:9030/shop"
max_retries = 3
enable_upsert_delete = true
schema_save_mode="RECREATE_SCHEMA"
data_save_mode="DROP_DATA"
save_mode_create_template = """
CREATE TABLE IF NOT EXISTS shop.`${table_name}` (
${rowtype_primary_key},
${rowtype_fields}
) ENGINE=OLAP
PRIMARY KEY (${rowtype_primary_key})
DISTRIBUTED BY HASH (${rowtype_primary_key})
PROPERTIES (
"replication_num" = "1",
"in_memory" = "false",
"enable_persistent_index" = "true",
"replicated_storage" = "true",
"compression" = "LZ4"
)
"""
}
}
env {
# You can set engine configuration here
parallelism = 1
job.mode = "STREAMING"
checkpoint.interval = 5000
}
source {
MySQL-CDC {
server-id = 5652-5657
username = "st_user_source"
password = "mysqlpw"
table-names = ["shop.products"]
url = "jdbc:mysql://mysql_cdc_e2e:3306/shop"
schema-changes.enabled = true
}
}
sink {
Doris {
fenodes = "doris_e2e:8030"
username = "root"
password = ""
database = "shop"
table = "products"
sink.label-prefix = "test-cdc"
sink.enable-2pc = "true"
sink.enable-delete = "true"
doris.config {
format = "json"
read_json_by_line = "true"
}
}
}
env { # You can set engine configuration here parallelism = 5 job.mode = "STREAMING" checkpoint.interval = 5000 read_limit.bytes_per_second=7000000 read_limit.rows_per_second=400 } source { MySQL-CDC { server-id = 5652-5657 username = "st_user_source" password = "mysqlpw" table-names = ["shop.products"] url = "jdbc:mysql://mysql_cdc_e2e:3306/shop" schema-changes.enabled = true } } sink { jdbc { url = "jdbc:postgresql://postgresql:5432/shop" driver = "org.postgresql.Driver" user = "postgres" password = "postgres" generate_sink_sql = true database = shop table = "public.sink_table_with_schema_change" primary_keys = ["id"] # Validate ddl update for sink writer multi replica multi_table_sink_replica = 2 } }
env { # You can set engine configuration here parallelism = 5 job.mode = "STREAMING" checkpoint.interval = 5000 read_limit.bytes_per_second=7000000 read_limit.rows_per_second=400 } source { MySQL-CDC { server-id = 5652-5657 username = "st_user_source" password = "mysqlpw" table-names = ["shop.products"] url = "jdbc:mysql://mysql_cdc_e2e:3306/shop" schema-changes.enabled = true } } sink { jdbc { url = "jdbc:dm://e2e_dmdb:5236" driver = "dm.jdbc.driver.DmDriver" connection_check_timeout_sec = 1000 user = "SYSDBA" password = "SYSDBA" generate_sink_sql = true database = "DAMENG" table = "SYSDBA.sink_table_with_schema_change" primary_keys = ["id"] # Validate ddl update for sink writer multi replica multi_table_sink_replica = 2 } }
env { # You can set engine configuration here parallelism = 5 job.mode = "STREAMING" checkpoint.interval = 5000 read_limit.bytes_per_second=7000000 read_limit.rows_per_second=400 } source { MySQL-CDC { server-id = 5652-5657 username = "st_user_source" password = "mysqlpw" table-names = ["shop.products"] url = "jdbc:mysql://mysql_cdc_e2e:3306/shop" schema-changes.enabled = true } } sink { jdbc { url = "jdbc:sqlserver://e2e_sqlserver:1433" driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver" user = "sa" password = "paanssy1234$" generate_sink_sql = true database = master table = "dbo.sink_table_with_schema_change" primary_keys = ["id"] # Validate ddl update for sink writer multi replica multi_table_sink_replica = 2 } }