invalid input syntax for type json aws dms postgres

Question

I'm running a task that migrates all data from a postgres 10.4 to a RDS postgres 10.4. Not able to migrate tables which have jsonb column. After error, whole table is getting suspended.Table contain 449 rows only.

I have made following error policy, still whole table suspended. "DataErrorPolicy": "IGNORE_RECORD", "DataTruncationErrorPolicy": "IGNORE_RECORD", "DataErrorEscalationPolicy": "SUSPEND_TABLE", "DataErrorEscalationCount": 1000,

My expectation is that whole table should be transferred, it can ignore record if any json is wrong. I dont know why its giving this error 'invalid input syntax for type json' , i have checked all json and all jsons are valid.

After debugging more, this error has been considered as TABLE error , but why ? Thats why table got suspended since TableErrorPolicy is 'SUSPEND_TABLE'. Why this error considered as table error instead of record error?

Is JSONB column not supported by DMS thats why we are getting below error?

Logs :-

2020-09-01T12:10:04 https://forums.aws.amazon.com/I: Next table to load 'public'.'TEMP_TABLE' ID = 1, order = 0 (tasktablesmanager.c:1817)
2020-09-01T12:10:04 https://forums.aws.amazon.com/I: Start loading table 'public'.'TEMP_TABLE' (Id = 1) by subtask 1. 
Start load timestamp 0005AE3F66381F0F (replicationtask_util.c:755)
2020-09-01T12:10:04 https://forums.aws.amazon.com/I: REPLICA IDENTITY information for table 'public'.'TEMP_TABLE': Query status='Success' Type='DEFAULT' 
Description='Old values of the Primary Key columns (if any) will be captured.' (postgres_endpoint_unload.c:191)
2020-09-01T12:10:04 https://forums.aws.amazon.com/I: Unload finished for table 'public'.'TEMP_TABLE' (Id = 1). 449 rows sent. (streamcomponent.c:3485)
2020-09-01T12:10:04 https://forums.aws.amazon.com/I: Table 'public'.'TEMP_TABLE' contains LOB columns, change working mode to default mode (odbc_endpoint_imp.c:4775)
2020-09-01T12:10:04 https://forums.aws.amazon.com/I: Table 'public'.'TEMP_TABLE' has Non-Optimized Full LOB Support (odbc_endpoint_imp.c:4788)
2020-09-01T12:10:04 https://forums.aws.amazon.com/I: Load finished for table 'public'.'TEMP_TABLE' (Id = 1). 449 rows received. 0 rows skipped.
Volume transferred 190376. (streamcomponent.c:3770)
2020-09-01T12:10:04 https://forums.aws.amazon.com/E: RetCode: SQL_ERROR SqlState: 22P02 NativeError: 1 Message: ERROR: invalid input syntax for type json; 
Error while executing the query https://forums.aws.amazon.com/ (ar_odbc_stmt.c:2648)
2020-09-01T12:10:04 https://forums.aws.amazon.com/W: Table 'public'.'TEMP_TABLE' (subtask 1 thread 1) is suspended (replicationtask.c:2471)

Edit- after debugging more, this error has been considered as TABLE error , but why ?

Answer 1

JSONB column data type must be nullable in target DB.

Note- In my case, after making JSONB column as nullable, this error disappeared.

As mentioned in AWS documentation-

In this case, AWS DMS treats JSONB data as if it were a LOB column. During the full load phase of a migration, the target column must be nullable.

https://docs.aws.amazon.com/dms/latest/userguide/CHAP_Source.PostgreSQL.html#CHAP_Source.PostgreSQL.Prerequisites

https://aws.amazon.com/premiumsupport/knowledge-center/dms-error-null-value-column/

Answer 2

AWS DMS treats the JSON data type in PostgreSQL as a LOB data type column. This means that the LOB size limitation when you use limited LOB mode applies to JSON data. For example, suppose that limited LOB mode is set to 4,096 KB. In this case, any JSON data larger than 4,096 KB is truncated at the 4,096 KB limit and fails the validation test in PostgreSQL.

Reference: AWS DMS - JSON data types being truncated

Update: You can tweak the error handling task settings to skip erroneous rows by setting the value for DataErrorPolicy to IGNORE_RECORD which determines the action AWS DMS takes when there is an error related to data processing at the record level. Some examples of data processing errors include conversion errors, errors in transformation, and bad data. The default is LOG_ERROR. IGNORE_RECORD, the task continues and the data for that record is ignored.

Reference: AWS DMS - Error handling task settings