thanks Hongshun for your response ! Le ven. 17 mai 2024 à 07:51, Hongshun Wang <loserwang1...@gmail.com> a écrit :
> Hi Thomas, > > In debezium dos says: For the connector to detect and process events from > a heartbeat table, you must add the table to the PostgreSQL publication > specified by the publication.name > <https://debezium.io/documentation/reference/stable/connectors/postgresql.html#postgresql-property-publication-name> > property. > If this publication predates your Debezium deployment, the connector uses > the publications as defined. If the publication is not already configured > to automatically replicate changes FOR ALL TABLES in the database, you > must explicitly add the heartbeat table to the publication[2]. > > Thus, if you want use heart beat in cdc: > > 1. add a heartbeat table to publication: ALTER PUBLICATION > *<publicationName>* ADD TABLE *<heartbeatTableName>*; > 2. set heartbeatInterval > 3. add debezium.heartbeat.action.query > > <https://debezium.io/documentation/reference/stable/connectors/postgresql.html#postgresql-property-heartbeat-action-query> > [3] > > However, when I use it it CDC, some exception occurs: > > Caused by: java.lang.NullPointerException > at > io.debezium.heartbeat.HeartbeatFactory.createHeartbeat(HeartbeatFactory.java:55) > at io.debezium.pipeline.EventDispatcher.<init>(EventDispatcher.java:127) > at io.debezium.pipeline.EventDispatcher.<init>(EventDispatcher.java:94) > > > > > It seems CDC don't add a HeartbeatConnectionProvider when configure > PostgresEventDispatcher: > > //org.apache.flink.cdc.connectors.postgres.source.fetch.PostgresSourceFetchTaskContext#configurethis.postgresDispatcher > = > new PostgresEventDispatcher<>( > dbzConfig, > topicSelector, > schema, > queue, > dbzConfig.getTableFilters().dataCollectionFilter(), > DataChangeEvent::new, > metadataProvider, > schemaNameAdjuster); > > > In debezium, when PostgresConnectorTask start, it will do it > > //io.debezium.connector.postgresql.PostgresConnectorTask#start final > PostgresEventDispatcher<TableId> dispatcher = new PostgresEventDispatcher<>( > connectorConfig, > topicNamingStrategy, > schema, > queue, > connectorConfig.getTableFilters().dataCollectionFilter(), > DataChangeEvent::new, > PostgresChangeRecordEmitter::updateSchema, > metadataProvider, > connectorConfig.createHeartbeat( > topicNamingStrategy, > schemaNameAdjuster, > () -> new > PostgresConnection(connectorConfig.getJdbcConfig(), > PostgresConnection.CONNECTION_GENERAL), > exception -> { > String sqlErrorId = exception.getSQLState(); > switch (sqlErrorId) { > case "57P01": > // Postgres error admin_shutdown, see > https://www.postgresql.org/docs/12/errcodes-appendix.html > throw new DebeziumException("Could not execute heartbeat > action query (Error: " + sqlErrorId + ")", exception); > case "57P03": > // Postgres error cannot_connect_now, > see https://www.postgresql.org/docs/12/errcodes-appendix.html > throw new RetriableException("Could not execute > heartbeat action query (Error: " + sqlErrorId + ")", exception); > default: > break; > } > }), > schemaNameAdjuster, > signalProcessor); > > Thus, I have create a new jira[4] to fix it. > > > > [1] > https://nightlies.apache.org/flink/flink-cdc-docs-master/docs/connectors/legacy-flink-cdc-sources/postgres-cdc/ > > [2] > https://debezium.io/documentation/reference/stable/connectors/postgresql.html#postgresql-property-heartbeat-interval-ms > > [3] > https://debezium.io/documentation/reference/stable/connectors/postgresql.html#postgresql-property-heartbeat-action-query > > [4] https://issues.apache.org/jira/browse/FLINK-35387 > > > Best > > Hongshun > > On Thu, May 16, 2024 at 9:03 PM Thomas Peyric <thomas.pey...@asklocala.com> > wrote: > >> Hi Flink Community ! >> >> I am using : >> * Flink >> * Flink CDC posgtres Connector >> * scala + sbt >> >> versions are : >> * orgApacheKafkaVersion = "3.2.3" >> * flinkVersion = "1.19.0" >> * flinkKafkaVersion = "3.0.2-1.18" >> * flinkConnectorPostgresCdcVersion = "3.0.1" >> * debeziumVersion = "1.9.8.Final" >> * scalaVersion = "2.12.13" >> * javaVersion = "11" >> >> >> the problem >> ----------- >> >> I have a problem with the heartbeat interval feature: >> * when I am querying PG with `select * from pg_replication_slots;` for >> checking if information are updated on each replication slots at defined >> interval >> * then confirmed_flush_lsn values are never updated >> PS: i have other replication slots managed directly with debezium >> (without flink) and their confirmed_flush_lsn values are updated correctly >> (same pg DB) depending of their own interval >> >> ``` >> slot_name | plugin | slot_type | datoid | >> database | temporary | active | active_pid | xmin | catalog_xmin | >> restart_lsn | confirmed_flush_lsn >> >> ----------------------------+----------+-----------+-----------+-------------------+-----------+--------+------------+------+--------------+--------------+--------------------- >> slot_table1 | pgoutput | logical | 811518778 | the_db >> | f | t | 10870 | | 1630392036 | >> 712/697C0DB8 | 712/697C0DF0 >> slot_table2 | pgoutput | logical | 811518778 | the_db >> | f | t | 10894 | | 1630392033 | >> 712/697AD0A8 | 712/697AD0E0 >> slot_table3 | pgoutput | logical | 811518778 | the_db >> | f | t | 10978 | | 1630392034 | >> 712/697AD0A8 | 712/697AD0A8 >> ``` >> >> >> >> My setup >> -------- >> >> I have configured 3 distinct DataStreamSource on 3 pg database tables >> using this common method : >> >> ``` >> private def initEntityDataSource(conf: Config, env: >> StreamExecutionEnvironment, entityName: String, columnList: String) = { >> >> val dbzProps: Properties = new Properties() >> dbzProps.setProperty("column.include.list", columnList) >> // "public.tableX.column1,public.tableX.column2" >> >> val postgresIncrementalSource: >> PostgresSourceBuilder.PostgresIncrementalSource[String] = >> PostgresSourceBuilder.PostgresIncrementalSource.builder() >> .hostname(conf.getString("pg.hostname")) >> .port(conf.getInt("pg.port")) >> .database(conf.getString("pg.database")) >> .username(conf.getString("pg.username")) >> .password(conf.getString("pg.password")) >> .slotName(conf.getString(s"flink.${entityName}.slot_name")) >> // slot_tableX >> .decodingPluginName("pgoutput") >> .includeSchemaChanges(true) >> .deserializer(new JsonDebeziumDeserializationSchema()) >> .closeIdleReaders(true) >> .heartbeatInterval(Duration.ofMillis(10000)) >> // <-- // 10 seconds >> .connectTimeout(Duration.ofSeconds(10)) >> // 10 Seconds >> .startupOptions(StartupOptions.initial()) >> .schemaList("public") >> .tableList("public." + >> conf.getString(s"flink.${entityName}.table_name")) // public.tableX >> .debeziumProperties(dbzProps) >> // <-- // dbzProps >> .build() >> >> env.fromSource(postgresIncrementalSource, >> WatermarkStrategy.noWatermarks[String](), s"pg-projector-${entityName}") >> .setParallelism(1) >> >> } >> ``` >> >> After that I have converted each DataStreamSource into Table >> And I join those 3 Table and convert result into a DataStream[Row] >> >> On this new DataStream I do a keyBy for processing a custom >> KeyedProcessFunction function >> >> All of this is working fine and do its job >> >> But heartbeat seems to not refresh values into >> pg_replication_slots.confirmed_flush_lsn column >> >> >> PS: I also try this : >> >> 1) instead of using the .heartbeatInterval() method to set the value of >> interval ... i use debezium properties like this >> >> ``` >> dbzProps.setProperty("heartbeat.interval.ms", "10000") // and also >> "PT10S" >> ``` >> >> it seems there is no effect with this >> >> 2) it seems that debezium needs to create a kafka topic for managing >> heartbeat. In theory, If the topic does not exist it will be automaitcally >> created >> But my kafka server does not authorize this auto creation ... so i create >> this topic mannually with this name : >> `__flink-heartbeat.postgres_cdc_source` >> >> i also add this dbzProps for setting the good topic prefix >> >> ``` >> dbzProps.setProperty("topic.heartbeat.prefix", "__flink-heartbeat") >> ``` >> >> it seems there is no effect with this too >> >> >> >> >> So ... Do you have any ideas ? >> >> Thanks, >> >> Thomas >> >> ------------------------------ >> You received this electronic message as part of a business or employment >> relationship with one or several Ask Locala entities. Its content is >> strictly confidential and is covered by the obligation of confidentiality >> and business secrecy. Any dissemination, copying, printing distribution, >> retention or use of the message’s content or any attachments that could be >> detrimental to Ask Locala is forbidden, even if it was forwarded by mailing >> lists. >> >> If you are not the intended recipient, please notify the sender of the >> error without delay and delete permanently this email and any files from >> your system and destroy any printed copies. >> > -- [image: Locala] <https://www.asklocala.com/> Thomas PEYRIC BACKEND ENGINEER thomas.pey...@asklocala.com Docks de la Joliette Atrium 10.8, 4eme étage droite. 10 Place de la Joliette, 13002 Marseille - FRANCE. -- You received this electronic message as part of a business or employment relationship with one or several Ask Locala entities. Its content is strictly confidential and is covered by the obligation of confidentiality and business secrecy. 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