Diagnosing Vitess Query Routing Failures: 'No Tablets Available'
Learn how to diagnose and fix 'No tablets available' errors in Vitess by validating topology state, clearing vtgate caches, and verifying shard mappings.
Loading…
ReadMeFeed / Community knowledge
#vttablet
Real questions. Useful conversations. Find the people who know your stack.
vitessDiagnosing Vitess 'No Healthy Tablet Available' Errors from vtgate
A diagnostic guide for Vitess 'no healthy tablet available' errors: how to tell real tablet failures from stale discovery and planned reparent windows, with ordered checks and fixes.
Does VTTablet credential caching delay password expiration enforcement?
Vitess delegates authentication to the underlying MySQL server, where least-privilege access is managed via standard MySQL user privileges. When a user's password expires on the MySQL server, VTGate typically forwards the authentication request, and the connection fails with MySQL error 1820. However, VTTablet maintains a cache of connections to the underlyi
vtgate to vttablet: expired MySQL backend credentials and sandbox-mode error propagation across the connection pool
In a Vitess cluster, vtgate terminates the client MySQL protocol while vttablet brokers queries to a backing MySQL instance using its own configured application and administrative accounts. When a backend MySQL account is subject to password expiration or is scoped to a least-privilege role, the failure mode at the vtgate-to-vttablet boundary is not obvious: