合 PG数据同步到kafka
👉 本文共约2362个字，系统预计阅读时间或需9分钟。
目录
简介
目前CDC（Change Data Capture）工具还是比较多的 ，现在有部分增量数据同步工具是基于触发器实现的，把数据库的变化记录到某个系统表中，然后在客户端建立缓冲，并定期将变化push到接收端，接收端和发送端建立通道，并定期pull新的数据变化，并在目标数据库回放 。
但因为使用了触发器会影响生产环境的性能，这点可能无法接受 ，其他的增量数据同步工具中占比比较大的一类，是基于kafka来实现的。例如RedHat开源的 Debezium。通过抽取数据库日志来获取变更，实现增量数据同步。
其它工具也可以将PG同步到kafka，搜索了一下，列举如下：
debezium：https://debezium.io/ ，https://github.com/debezium/debezium 一直在更新
BottledWater，地址：https://github.com/confluentinc/bottledwater-pg ，6年未更新，且官方明确说明不再维护
amazonriver，地址：https://github.com/hellobike/amazonriver , 3年未更新
tunnel，地址：https://github.com/hellobike/tunnel , 3年未更新
flinkx，地址：https://github.com/flinkx/flinkx ，2年未更新
下面是一个PostgreSQL数据同步至kafka 的例子。
环境申请
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | -- PG数据库 docker rm -f lhrpg2kafka docker run -d --name lhrpg2kafka -h lhrpg2kafka \ -p 5432:5432 \ -v /sys/fs/cgroup:/sys/fs/cgroup \ --privileged=true lhrbest/lhrpgall:2.0 \ /usr/sbin/init docker exec -it lhrpg2kafka bash -- kafka环境 docker rm -f lhrkafka docker run -itd --name lhrkafka -h lhrkafka \ -p 9092:9092 -p 2181:2181 \ -v /sys/fs/cgroup:/sys/fs/cgroup \ --privileged=true lhrbest/lhrcentos76:9.0 \ /usr/sbin/init docker exec -it lhrkafka bash -- PG操作 systemctl stop pg94 pg96 pg10 pg11 pg12 pg13 systemctl disable pg94 pg96 pg10 pg11 pg12 pg13 systemctl status postgresql-13 |
安装kafka环境
1 | docker exec -it lhrkafka bash |
安装java
1 2 3 4 5 6 7 | yum install -y java-1.8.0-openjdk* [root@test ~]# java -version openjdk version "1.8.0_332" OpenJDK Runtime Environment (build 1.8.0_332-b09) OpenJDK 64-Bit Server VM (build 25.332-b09, mixed mode) [root@test ~]# |
安装kafka
从kafka 2.8.0开始，自带zookeeper，无需额外安装ZooKeeper。
下载：https://kafka.apache.org/downloads.html , 大约100MB
1 2 3 4 5 6 7 8 9 10 11 | wget https://dlcdn.apache.org/kafka/3.2.0/kafka_2.13-3.2.0.tgz --no-check-certificate tar -zxvf kafka_2.13-3.2.0.tgz -C /usr/local/ cd /usr/local/ mv /usr/local/kafka_2.13-3.2.0/ /usr/local/kafka-2.13-3.2.0 ln -s /usr/local/kafka-2.13-3.2.0 /usr/local/kafka -- 启动zk和kfk /usr/local/kafka/bin/zookeeper-server-start.sh /usr/local/kafka/config/zookeeper.properties & /usr/local/kafka/bin/kafka-server-start.sh /usr/local/kafka/config/server.properties & jps |
查看java进程：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | [root@lhrkafka bin]# netstat -tulnp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:34707 0.0.0.0:* LISTEN 24770/java tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 152/sshd tcp 0 0 0.0.0.0:9092 0.0.0.0:* LISTEN 25868/java tcp 0 0 0.0.0.0:2181 0.0.0.0:* LISTEN 24770/java tcp 0 0 0.0.0.0:35591 0.0.0.0:* LISTEN 25868/java tcp6 0 0 127.0.0.1:3350 :::* LISTEN 154/xrdp-sesman tcp6 0 0 :::22 :::* LISTEN 152/sshd tcp6 0 0 :::3389 :::* LISTEN 155/xrdp [root@lhrkafka bin]# jps 24770 QuorumPeerMain 26340 Jps 25868 Kafka [root@lhrkafka bin]# ps -ef|grep java root 24770 165 1 17:40 pts/1 00:00:03 java -Xmx512M -Xms512M -server -XX:+UseG1GC -XX:MaxGCPauseMillis=20 -XX:InitiatingHeapOccupancyPercent=35 -XX:+ExplicitGCInvokesConcurrent -XX:MaxInlineLevel=15 -Djava.awt.headless=true -Xloggc:/usr/local/kafka/bin/../logs/zookeeper-gc.log -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=100M -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dkafka.logs.dir=/usr/local/kafka/bin/../logs -Dlog4j.configuration=file:/usr/local/kafka/bin/../config/log4j.properties -cp /usr/local/kafka/bin/../libs/activation-1.1.1.jar:/usr/local/kafka/bin/../libs/aopalliance-repackaged-2.6.1.jar:/usr/local/kafka/bin/../libs/argparse4j-0.7.0.jar:/usr/local/kafka/bin/../libs/audience-annotations-0.5.0.jar:/usr/local/kafka/bin/../libs/commons-cli-1.4.jar:/usr/local/kafka/bin/../libs/commons-lang3-3.8.1.jar:/usr/local/kafka/bin/../libs/connect-api-3.2.0.jar:/usr/local/kafka/bin/../libs/connect-basic-auth-extension-3.2.0.jar:/usr/local/kafka/bin/../libs/connect-json-3.2.0.jar:/usr/local/kafka/bin/../libs/connect-mirror-3.2.0.jar:/usr/local/kafka/bin/../libs/connect-mirror-client-3.2.0.jar:/usr/local/kafka/bin/../libs/connect-runtime-3.2.0.jar:/usr/local/kafka/bin/../libs/connect-transforms-3.2.0.jar:/usr/local/kafka/bin/../libs/hk2-api-2.6.1.jar:/usr/local/kafka/bin/../libs/hk2-locator-2.6.1.jar:/usr/local/kafka/bin/../libs/hk2-utils-2.6.1.jar:/usr/local/kafka/bin/../libs/jackson-annotations-2.12.6.jar:/usr/local/kafka/bin/../libs/jackson-core-2.12.6.jar:/usr/local/kafka/bin/../libs/jackson-databind-2.12.6.1.jar:/usr/local/kafka/bin/../libs/jackson-dataformat-csv-2.12.6.jar:/usr/local/kafka/bin/../libs/jackson-datatype-jdk8-2.12.6.jar:/usr/local/kafka/bin/../libs/jackson-jaxrs-base-2.12.6.jar:/usr/local/kafka/bin/../libs/jackson-jaxrs-json-provider-2.12.6.jar:/usr/local/kafka/bin/../libs/jackson-module-jaxb-annotations-2.12.6.jar:/usr/local/kafka/bin/../libs/jackson-module-scala_2.13-2.12.6.jar:/usr/local/kafka/bin/../libs/jakarta.activation-api-1.2.1.jar:/usr/local/kafka/bin/../libs/jakarta.annotation-api-1.3.5.jar:/usr/local/kafka/bin/../libs/jakarta.inject-2.6.1.jar:/usr/local/kafka/bin/../libs/jakarta.validation-api-2.0.2.jar:/usr/local/kafka/bin/../libs/jakarta.ws.rs-api-2.1.6.jar:/usr/local/kafka/bin/../libs/jakarta.xml.bind-api-2.3.2.jar:/usr/local/kafka/bin/../libs/javassist-3.27.0-GA.jar:/usr/local/kafka/bin/../libs/javax.servlet-api-3.1.0.jar:/usr/local/kafka/bin/../libs/javax.ws.rs-api-2.1.1.jar:/usr/local/kafka/bin/../libs/jaxb-api-2.3.0.jar:/usr/local/kafka/bin/../libs/jersey-client-2.34.jar:/usr/local/kafka/bin/../libs/jersey-common-2.34.jar:/usr/local/kafka/bin/../libs/jersey-container-servlet-2.34.jar:/usr/local/kafka/bin/../libs/jersey-container-servlet-core-2.34.jar:/usr/local/kafka/bin/../libs/jersey-hk2-2.34.jar:/usr/local/kafka/bin/../libs/jersey-server-2.34.jar:/usr/local/kafka/bin/../libs/jetty-client-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-continuation-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-http-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-io-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-security-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-server-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-servlet-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-servlets-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-util-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-util-ajax-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jline-3.21.0.jar:/usr/local/kafka/bin/../libs/jopt-simple-5.0.4.jar:/usr/local/kafka/bin/../libs/jose4j-0.7.9.jar:/usr/local/kafka/bin/../libs/kafka_2.13-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-clients-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-log4j-appender-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-metadata-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-raft-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-server-common-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-shell-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-storage-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-storage-api-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-streams-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-streams-examples-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-streams-scala_2.13-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-streams-test-utils-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-tools-3.2.0.jar:/usr/local/kafka/bin/../libs/lz4-java-1.8.0.jar:/usr/local/kafka/bin/../libs/maven-artifact-3.8.4.jar:/usr/local/kafka/bin/../libs/metrics-core-2.2.0.jar:/usr/local/kafka/bin/../libs/metrics-core-4.1.12.1.jar:/usr/local/kafka/bin/../libs/netty-buffer-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/netty-codec-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/netty-common-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/netty-handler-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/netty-resolver-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/netty-tcnative-classes-2.0.46.Final.jar:/usr/local/kafka/bin/../libs/netty-transport-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/netty-transport-classes-epoll-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/netty-transport-native-epoll-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/netty-transport-native-unix-common-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/osgi-resource-locator-1.0.3.jar:/usr/local/kafka/bin/../libs/paranamer-2.8.jar:/usr/local/kafka/bin/../libs/plexus-utils-3.3.0.jar:/usr/local/kafka/bin/../libs/reflections-0.9.12.jar:/usr/local/kafka/bin/../libs/reload4j-1.2.19.jar:/usr/local/kafka/bin/../libs/rocksdbjni-6.29.4.1.jar:/usr/local/kafka/bin/../libs/scala-collection-compat_2.13-2.6.0.jar:/usr/local/kafka/bin/../libs/scala-java8-compat_2.13-1.0.2.jar:/usr/local/kafka/bin/../libs/scala-library-2.13.8.jar:/usr/local/kafka/bin/../libs/scala-logging_2.13-3.9.4.jar:/usr/local/kafka/bin/../libs/scala-reflect-2.13.8.jar:/usr/local/kafka/bin/../libs/slf4j-api-1.7.36.jar:/usr/local/kafka/bin/../libs/slf4j-reload4j-1.7.36.jar:/usr/local/kafka/bin/../libs/snappy-java-1.1.8.4.jar:/usr/local/kafka/bin/../libs/trogdor-3.2.0.jar:/usr/local/kafka/bin/../libs/zookeeper-3.6.3.jar:/usr/local/kafka/bin/../libs/zookeeper-jute-3.6.3.jar:/usr/local/kafka/bin/../libs/zstd-jni-1.5.2-1.jar org.apache.zookeeper.server.quorum.QuorumPeerMain /usr/local/kafka/config/zookeeper.properties root 25868 165 27 17:43 pts/1 00:00:13 java -Xmx1G -Xms1G -server -XX:+UseG1GC -XX:MaxGCPauseMillis=20 -XX:InitiatingHeapOccupancyPercent=35 -XX:+ExplicitGCInvokesConcurrent -XX:MaxInlineLevel=15 -Djava.awt.headless=true -Xloggc:/usr/local/kafka/bin/../logs/kafkaServer-gc.log -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=100M -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dkafka.logs.dir=/usr/local/kafka/bin/../logs -Dlog4j.configuration=file:/usr/local/kafka/bin/../config/log4j.properties -cp /usr/local/kafka/bin/../libs/activation-1.1.1.jar:/usr/local/kafka/bin/../libs/aopalliance-repackaged-2.6.1.jar:/usr/local/kafka/bin/../libs/argparse4j-0.7.0.jar:/usr/local/kafka/bin/../libs/audience-annotations-0.5.0.jar:/usr/local/kafka/bin/../libs/commons-cli-1.4.jar:/usr/local/kafka/bin/../libs/commons-lang3-3.8.1.jar:/usr/local/kafka/bin/../libs/connect-api-3.2.0.jar:/usr/local/kafka/bin/../libs/connect-basic-auth-extension-3.2.0.jar:/usr/local/kafka/bin/../libs/connect-json-3.2.0.jar:/usr/local/kafka/bin/../libs/connect-mirror-3.2.0.jar:/usr/local/kafka/bin/../libs/connect-mirror-client-3.2.0.jar:/usr/local/kafka/bin/../libs/connect-runtime-3.2.0.jar:/usr/local/kafka/bin/../libs/connect-transforms-3.2.0.jar:/usr/local/kafka/bin/../libs/hk2-api-2.6.1.jar:/usr/local/kafka/bin/../libs/hk2-locator-2.6.1.jar:/usr/local/kafka/bin/../libs/hk2-utils-2.6.1.jar:/usr/local/kafka/bin/../libs/jackson-annotations-2.12.6.jar:/usr/local/kafka/bin/../libs/jackson-core-2.12.6.jar:/usr/local/kafka/bin/../libs/jackson-databind-2.12.6.1.jar:/usr/local/kafka/bin/../libs/jackson-dataformat-csv-2.12.6.jar:/usr/local/kafka/bin/../libs/jackson-datatype-jdk8-2.12.6.jar:/usr/local/kafka/bin/../libs/jackson-jaxrs-base-2.12.6.jar:/usr/local/kafka/bin/../libs/jackson-jaxrs-json-provider-2.12.6.jar:/usr/local/kafka/bin/../libs/jackson-module-jaxb-annotations-2.12.6.jar:/usr/local/kafka/bin/../libs/jackson-module-scala_2.13-2.12.6.jar:/usr/local/kafka/bin/../libs/jakarta.activation-api-1.2.1.jar:/usr/local/kafka/bin/../libs/jakarta.annotation-api-1.3.5.jar:/usr/local/kafka/bin/../libs/jakarta.inject-2.6.1.jar:/usr/local/kafka/bin/../libs/jakarta.validation-api-2.0.2.jar:/usr/local/kafka/bin/../libs/jakarta.ws.rs-api-2.1.6.jar:/usr/local/kafka/bin/../libs/jakarta.xml.bind-api-2.3.2.jar:/usr/local/kafka/bin/../libs/javassist-3.27.0-GA.jar:/usr/local/kafka/bin/../libs/javax.servlet-api-3.1.0.jar:/usr/local/kafka/bin/../libs/javax.ws.rs-api-2.1.1.jar:/usr/local/kafka/bin/../libs/jaxb-api-2.3.0.jar:/usr/local/kafka/bin/../libs/jersey-client-2.34.jar:/usr/local/kafka/bin/../libs/jersey-common-2.34.jar:/usr/local/kafka/bin/../libs/jersey-container-servlet-2.34.jar:/usr/local/kafka/bin/../libs/jersey-container-servlet-core-2.34.jar:/usr/local/kafka/bin/../libs/jersey-hk2-2.34.jar:/usr/local/kafka/bin/../libs/jersey-server-2.34.jar:/usr/local/kafka/bin/../libs/jetty-client-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-continuation-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-http-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-io-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-security-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-server-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-servlet-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-servlets-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-util-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jetty-util-ajax-9.4.44.v20210927.jar:/usr/local/kafka/bin/../libs/jline-3.21.0.jar:/usr/local/kafka/bin/../libs/jopt-simple-5.0.4.jar:/usr/local/kafka/bin/../libs/jose4j-0.7.9.jar:/usr/local/kafka/bin/../libs/kafka_2.13-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-clients-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-log4j-appender-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-metadata-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-raft-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-server-common-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-shell-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-storage-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-storage-api-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-streams-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-streams-examples-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-streams-scala_2.13-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-streams-test-utils-3.2.0.jar:/usr/local/kafka/bin/../libs/kafka-tools-3.2.0.jar:/usr/local/kafka/bin/../libs/lz4-java-1.8.0.jar:/usr/local/kafka/bin/../libs/maven-artifact-3.8.4.jar:/usr/local/kafka/bin/../libs/metrics-core-2.2.0.jar:/usr/local/kafka/bin/../libs/metrics-core-4.1.12.1.jar:/usr/local/kafka/bin/../libs/netty-buffer-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/netty-codec-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/netty-common-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/netty-handler-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/netty-resolver-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/netty-tcnative-classes-2.0.46.Final.jar:/usr/local/kafka/bin/../libs/netty-transport-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/netty-transport-classes-epoll-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/netty-transport-native-epoll-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/netty-transport-native-unix-common-4.1.73.Final.jar:/usr/local/kafka/bin/../libs/osgi-resource-locator-1.0.3.jar:/usr/local/kafka/bin/../libs/paranamer-2.8.jar:/usr/local/kafka/bin/../libs/plexus-utils-3.3.0.jar:/usr/local/kafka/bin/../libs/reflections-0.9.12.jar:/usr/local/kafka/bin/../libs/reload4j-1.2.19.jar:/usr/local/kafka/bin/../libs/rocksdbjni-6.29.4.1.jar:/usr/local/kafka/bin/../libs/scala-collection-compat_2.13-2.6.0.jar:/usr/local/kafka/bin/../libs/scala-java8-compat_2.13-1.0.2.jar:/usr/local/kafka/bin/../libs/scala-library-2.13.8.jar:/usr/local/kafka/bin/../libs/scala-logging_2.13-3.9.4.jar:/usr/local/kafka/bin/../libs/scala-reflect-2.13.8.jar:/usr/local/kafka/bin/../libs/slf4j-api-1.7.36.jar:/usr/local/kafka/bin/../libs/slf4j-reload4j-1.7.36.jar:/usr/local/kafka/bin/../libs/snappy-java-1.1.8.4.jar:/usr/local/kafka/bin/../libs/trogdor-3.2.0.jar:/usr/local/kafka/bin/../libs/zookeeper-3.6.3.jar:/usr/local/kafka/bin/../libs/zookeeper-jute-3.6.3.jar:/usr/local/kafka/bin/../libs/zstd-jni-1.5.2-1.jar kafka.Kafka /usr/local/kafka/config/server.properties root 26391 12262 0 17:44 pts/2 00:00:00 grep --color=auto java [root@lhrkafka bin]# |
kafka默认占用9092端口，ZK默认占用2181端口。
kafka日志：
1 | tailf /usr/local/kafka/logs/server.log |
测试一下，在服务器上创建一个topic为test，然后生产几条信息：
1 2 3 4 5 6 7 8 9 10 | -- 生产者 /usr/local/kafka/bin/kafka-console-producer.sh --broker-list 127.0.0.1:9092 --topic test >hello >world -- 在另一台机器上，开启消费者控制台，监听test的topic，发现可以收到数据 /usr/local/kafka/bin/kafka-console-consumer.sh --bootstrap-server 172.17.0.3:9092 --topic test --from-beginning hello word |
数据库端操作
postgres 逻辑解码, 可以用jsonc或wal2json。
程序 jsoncdc（https://pgxn.org/dist/jsoncdc/）依赖于rust， 需要先安装 rust。
这里使用wal2json插件。
数据库安装wal2json
github：https://github.com/eulerto/wal2json
wal2json is an output plugin for logical decoding. It means that the plugin have access to tuples produced by INSERT and UPDATE. Also, UPDATE/DELETE old row versions can be accessed depending on the configured replica identity. Changes can be consumed using the streaming protocol (logical replication slots) or by a special SQL API.
wal2json可以提供基于PG库级别的DML日志挖掘工作。
1 2 3 4 5 6 7 8 | yum install -y wal2json_13 su - postgres psql alter system set shared_preload_libraries = 'wal2json.so' ; alter system set wal_level = logical ; systemctl restart postgresql-13 |
postgresql.conf里添加shared_preload_libraries = 'wal2json.so’并修改wal_level = logical，之后重启数据库。
1 2 3 4 5 6 7 8 | shared_preload_libraries = 'wal2json.so' wal_level = logical # # these parameters only need to set in versions 9.4, 9.5 and 9.6 # default values are ok in version 10 or later # max_replication_slots = 10 max_wal_senders = 10 |
如果是rpm安装的pg，最好使用rpm安装wal2json。如果是源码编译安装的pg，最好源码安装wal2json。
In Red Hat/CentOS:
1 | $ sudo yum install wal2json_13 |
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