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3.6 KiB
3.6 KiB
一、环境准备
PG版本 >= 9.4
1.修改wal 开启逻辑复制 (需要重启数据库)
编辑 postgresql.conf 文件,配置如下
# 更改wal日志方式为logical(方式有:minimal、replica 、logical )
wal_level = logical
# 更改solts最大数量(默认值为10),flink-cdc默认一张表占用一个slots
max_replication_slots = 20
# 更改wal发送最大进程数(默认值为10),这个值和上面的solts设置一样
max_wal_senders = 20
# 中断那些停止活动超过指定毫秒数的复制连接,可以适当设置大一点(默认60s,0表示禁用)
wal_sender_timeout = 180s
执行语句检查是否修改成功
SHOW wal_level;
2.发布表
-- 设置发布为true
update pg_publication set puballtables=true where pubname is not null;
-- 把所有表进行发布
CREATE PUBLICATION dbz_publication FOR ALL TABLES;
-- 查询哪些表已经发布
select * from pg_publication_tables;
3.更改表的复制标识包含更新和删除的值
-- 更改复制标识包含更新和删除之前值(目的是为了确保表 t_user 在实时同步过程中能够正确地捕获并同步更新和删除的数据变化。如果不执行这两条语句,那么 t_user 表的复制标识可能默认为 NOTHING,这可能导致实时同步时丢失更新和删除的数据行信息,从而影响同步的准确性)
ALTER TABLE t_user REPLICA IDENTITY FULL;
-- 查看复制标识(为f标识说明设置成功,f(表示 full),否则为 n(表示 nothing),即复制标识未设置)
select relreplident from pg_class where relname='t_user';
二、source配置详解
source {
Postgres-CDC {
slot.name = "pgslot01"
base-url = "jdbc:postgresql://10.2.0.5:5432/bjpt_hekou_v3?loggerLevel=OFF"
username = "zr"
password = "root@123"
database-names = ["bjpt_hekou_v3"]
schema-names = ["public"]
table-names = ["bjpt_hekou_v3.public.ms_t_crjry"]
startup.mode = "initial"
table-names-config = [
{
table = "bjpt_hekou_v3.public.ms_t_crjry"
primaryKeys = ["wybs"]
}
]
}
}
三、完整配置示例
env {
parallelism = 1
job.mode = "STREAMING"
}
source {
Postgres-CDC {
slot.name = "pgslot01"
base-url = "jdbc:postgresql://10.2.0.5:5432/bjpt_hekou_v3?loggerLevel=OFF"
username = "zr"
password = "root@123"
database-names = ["bjpt_hekou_v3"]
schema-names = ["public"]
table-names = ["bjpt_hekou_v3.public.ms_t_crjry"]
startup.mode = "initial"
table-names-config = [
{
table = "bjpt_hekou_v3.public.ms_t_crjry"
primaryKeys = ["wybs"]
}
]
}
}
sink {
Doris {
fenodes = "172.31.51.142:8030"
query-port = 9030
username = admin
password = "6G_FahdUxAh@K"
schema_save_mode = "CREATE_SCHEMA_WHEN_NOT_EXIST"
database = "bjbj"
table = "cdc_test_ms_t_crjry_pg"
sink.enable-2pc = "true"
sink.enable-delete = "true"
sink.label-prefix = "cdc_test_ms_t_crjry_pg"
doris.config = {
format="json"
read_json_by_line="true"
}
}
}
四、注意点
- 必须指定slot.name名称,并且重启任务时需要注意slot名称是否存在
!
- 重启任务时如果数据库提示 ‘replication slot xxxx is active’ 查询表查看 active 字段
select * from pg_replication_slots
执行一下语句关闭slot(关闭不是删除)