EC
HV00B
PostgreSQLERRORNotableForeign Data Wrapper ErrorHIGH confidence

fdw_invalid_handle

What this means

A foreign data wrapper received an invalid or expired handle reference, typically a connection or statement handle that is no longer valid.

Why it happens
  1. 1Connection handle to remote server was closed or invalidated before use
  2. 2Statement handle was freed prematurely in FDW C code
  3. 3Handle value is NULL when a valid handle is required
  4. 4FDW lifecycle management bug — handle used after end of its valid scope
How to reproduce

FDW operations that rely on persistent handles to remote connections or statements

trigger — this will error
trigger — this will error
SELECT * FROM foreign_table_with_broken_connection;

expected output

ERROR:  HV00B: fdw_invalid_handle

Fix

Recreate the foreign server connection

WHEN Handle became invalid due to remote server restart

Recreate the foreign server connection
ALTER SERVER myserver OPTIONS (SET host 'newhost');

Why this works

Forces FDW to establish a fresh connection with a valid handle

What not to do

✕ Do not ignore handle errors in FDW C code

Using an invalid handle leads to undefined behaviour and crashes

Sources
Official documentation ↗

https://www.postgresql.org/docs/current/errcodes-appendix.html

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