EC
1455
MariaDBERRORNotableStorage EngineHIGH confidence

Data source specified for FEDERATED table does not exist

Production Risk

High — all queries against the federated table will fail.

What this means

ER_FOREIGN_DATA_SOURCE_DOESNT_EXIST (1455, SQLSTATE HY000) is raised when a FEDERATED table cannot connect to its remote data source because the source does not exist or is unreachable.

Why it happens
  1. 1Remote MySQL server specified in the CONNECTION string is down or unreachable
  2. 2Remote database or table does not exist
  3. 3Firewall blocking the connection to the remote server
How to reproduce
trigger — this will error
trigger — this will error
CREATE TABLE federated_table (id INT)
ENGINE=FEDERATED
CONNECTION='mysql://user:pass@nonexistent-host/db/table';

expected output

ERROR 1455 (HY000): Data source error: 'nonexistent-host' doesn't exist

Fix

Verify the remote server is accessible

Verify the remote server is accessible
-- Test connectivity from command line:
-- mysql -h remote-host -u user -p db -e "SELECT 1"

-- Check the connection string format:
CONNECTION='mysql://user:password@host:3306/database/tablename'

Why this works

The FEDERATED engine requires the remote server to be running and accessible with the provided credentials.

Sources
Official documentation ↗

MySQL 8.0 — 1455 ER_FOREIGN_DATA_SOURCE_DOESNT_EXIST

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