HV00MERRORTier 2 — Caution✅ HIGH confidencefdw_unable_to_create_reply
Category: Foreign Data Wrapper ErrorVersions: PostgreSQL 9.1+
What this means
A foreign data wrapper was unable to create a reply object to receive results from the remote server after initiating query execution.
Why it happens
- 1Memory allocation failure when creating the reply structure
- 2Remote server closed the connection immediately after execution started
- 3FDW implementation error in the reply creation path
- 4Protocol mismatch between FDW and remote server version
How to reproduce
FDW query execution when result retrieval infrastructure cannot be created
trigger — this will ERROR
SELECT * FROM my_foreign_table;ERROR: HV00M: fdw_unable_to_create_reply
Fix 1: Check remote server version compatibility
Protocol mismatch suspected
fix
SELECT version() FROM foreign_version_table;Why this works
Confirms FDW and remote server are using compatible protocol versions
What not to do
✗
Do not assume the issue is local
Why it's wrong: This error originates at the FDW-to-remote boundary, not in local PostgreSQL
Sources
📚 Official docs: https://www.postgresql.org/docs/current/fdw-error-handling.html
🔧 Source ref: https://www.postgresql.org/docs/current/errcodes-appendix.html
Confidence assessment
✅ HIGH confidence
Standard FDW error code from official PostgreSQL appendix.
See also
📄 Reference pages
Writing a Foreign Data Wrapper
⚙️ This error reference was generated with AI assistance and reviewed for accuracy. Examples are provided to illustrate common scenarios and may not cover every case. Always test fixes in a development environment before applying to production. Spotted an error? Suggest a correction →