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DBZ-619 Document wal2json on RDS limitations #1

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DBZ-619 Document wal2json on RDS limitations #1

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7 changes: 7 additions & 0 deletions docs/connectors/postgresql.asciidoc
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Expand Up @@ -53,6 +53,13 @@ It is possible to monitor PostgreSQL database running in https://aws.amazon.com/
* Set `plugin.name` Debezium parameter to `wal2json`. Note that RDS is running older version of the plug-in. We are trying to detect that it is the case but the detection is not 100 % reliable. In case of problems use `wal2json_rds` value to manually override the detection routine.
* Use database master account for replication as RDS currently does not support setting of `REPLICATION` privilege for another account.

==== Known limitations
The `wal2json` plug-in used in Amazon RDS environment is not fully up-to-date with the recent additions to the upstream project.
Till the plug-in is updated please expect certain limits in capabilities vs the plug-in version used by Debezium.

* The replication message does not carry information about type contraints like length or scale or `NULL`/`NOT NULL`.
Debezium is thus not able to detect changes in type constraints (https://issues.jboss.org/browse/DBZ-504[DBZ-504]).

[[output-plugin]]
=== Installing the logical decoding output plugin

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