Postgresql AWS DMS任务在CDC模式下运行一段时间后失败

在初始迁移+CDC模式下，我在设置将RDS数据库（PostgreSQL，engine 10.15）中的数据迁移到S3存储桶的任务时遇到问题。 两个端点都已成功配置和测试。 我已经创建了两次任务，两次都最多运行了几个小时，第一次初始转储正常，一些增量转储也发生了，第二次只有初始转储完成，在任务失败之前没有执行增量转储

错误消息现在为：

Last Error Task 'data-migration-bp-dev' was suspended after 9 successive recovery failures Stop Reason FATAL_ERROR Error Level FATAL_

但就在它第一次失败之后，它是：

Last Error An internal WAL conversational protocol error has occurred. Task error notification received from subtask 0, thread 0 reptask/replicationtask.c:2859 1020452 Error executing source loop; Stream component failed at subtask 0, component st_0_data-migration-rds-bp-dev; Stream component 'st_0_data-migration-rds-bp-dev' terminated reptask/replicationtask.c:2866 1020452 Stop Reason RECOVERABLE_ERROR Error Level RECOVERABLE

在CloudWatch日志中，我看到以下错误消息：

SOURCE_CAPTURE I: Streaming initiated successfully (postgres_pglogical.c:274)
SOURCE_CAPTURE I: #1 : Non-monotonic LSN sequence: Current LSN '00000000/00000000' < Previous LSN '000001E3/94016430'. Event is ignored. (postgres_endpoint_wal_engine.c:710)
SOURCE_CAPTURE I: Unable to resolve attributes for relation id '28804'. Aborting action. (postgres_pglogical.c:1643)
SOURCE_CAPTURE I: End of CDC / CAPTURE events for POSTGRES endpoint. (postgres_endpoint_capture.c:520)
SOURCE_CAPTURE I: CAPTURE ended with exceptions. (postgres_endpoint_capture.c:527)
SOURCE_CAPTURE E: Could not find relation id '28804' in hash. 1020483 (postgres_pglogical.c:1470)
SOURCE_CAPTURE E: Failed to parse relation from dml command 1020483 (postgres_pglogical.c:2515)
SOURCE_CAPTURE E: Failed to find relation id on target while processing message from source 1020452 (postgres_endpoint_wal_engine.c:805)
SOURCE_CAPTURE E: WAL stream loop ended abnormally. (STATUS_PROTOCOL_ERROR) 1020452 (postgres_endpoint_wal_engine.c:992)
SOURCE_CAPTURE E: WAL reader terminated with irrecoverable error. 1020452 (postgres_endpoint_capture.c:496)
TASK_MANAGER I: Task - data-migration-bp-dev is in ERROR state, updating starting status to AR_NOT_APPLICABLE (repository.c:5102)
SOURCE_CAPTURE E: Error executing source loop 1020452 (streamcomponent.c:1870)
TASK_MANAGER E: Stream component failed at subtask 0, component st_0_data-migration-rds-bp-dev 1020452 (subtask.c:1409)
SOURCE_CAPTURE E: Stream component 'st_0_data-migration-rds-bp-dev' terminated 1020452 (subtask.c:1578)
TASK_MANAGER E: Task error notification received from subtask 0, thread 0 1020452 (replicationtask.c:2859)
TASK_MANAGER E: Error executing source loop; Stream component failed at subtask 0, component st_0_data-migration-rds-bp-dev; Stream component 'st_0_data-migration-rds-bp-dev' terminated 1020452 (replicationtask.c:2866)
TASK_MANAGER E: Task 'data-migration-bp-dev' encountered a recoverable error, retry attempt # 0 (repository.c:5184)

DMS任务失败的问题是否与pglogical插件配置有关？如果是这样，我们如何配置它使其工作（我们的db引擎应该与它兼容，不是吗？）？如果没有，如何修复

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提前谢谢你

如果将来有人遇到同样的错误，AWS技术专家告诉我们：

pglogical插件存在已知（AWS）问题。解决方案需要使用测试解码插件

通过在额外连接属性中指定pluginName=test_decoding，在DMS端点上强制使用test_decoding插件

使用此端点创建新的DMS任务（使用旧任务可能会由于任务和日志之间的不同步而导致任务失败）

它确实解决了这个问题，但我们仍然不知道DMS文档中到处强烈建议的插件到底有什么问题（目前）

ERROR: current database is not configured as pglogical node
HINT: create pglogical node first