fdw_unable_to_create_reply
Production Risk
High — foreign table queries fail to return data; application may see empty or error results.
A foreign data wrapper failed to construct a reply to send back from the remote side, typically indicating a protocol or memory error during FDW communication.
- 1FDW implementation encountered an unexpected error while preparing a response tuple.
- 2Out-of-memory condition on the remote server while building the reply.
- 3Network-level or protocol mismatch between FDW versions.
- 4Bug in a custom FDW when constructing return values.
SELECT * FROM my_foreign_table; -- custom FDW with reply-construction bug
expected output
ERROR: HV00R: fdw_unable_to_create_reply
Fix 1
Update the FDW extension to a newer version
ALTER EXTENSION my_fdw UPDATE;
Why this works
Replaces buggy reply-construction code in the FDW shared library.
Fix 2
Check remote server memory and logs
-- Review remote server PostgreSQL log for OOM or protocol errors
Why this works
Identifies if a resource exhaustion on the remote side is causing the reply failure.
✕ Do not ignore this error silently in application code
It indicates the FDW could not return data; results may be incomplete or absent
PostgreSQL 17 — HV00R fdw_unable_to_create_reply
Content generated with AI assistance and reviewed for accuracy. Found an error? hello@errcodes.dev