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db_mysql: recover from ER_UNKNOWN_STMT_HANDLER (1243) #3865

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db_mysql: recover from ER_UNKNOWN_STMT_HANDLER (1243) #3865

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9 changes: 9 additions & 0 deletions modules/db_mysql/dbase.c
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Original file line number Diff line number Diff line change
Expand Up @@ -164,6 +164,15 @@ static inline int wrapper_single_mysql_stmt_execute(const db_con_t *conn,
* while MariaDB has it as ER_REFERENCED_TRG_DOES_NOT_EXIST
*/
case 4031:
/* The server-side prepared-statement cache no longer knows
* about our stmt handle - e.g. after a managed-DB transparent
* failover or a zero-downtime minor version upgrade (AWS Aurora),
* where the backing instance is replaced while the client TCP
* connection is preserved. libmysqlclient auto-reprepare (which
* handles the related ER_NEED_REPREPARE case) does not kick in
* here because the server has no record of the handle at all.
* Fall back to the existing reconnect + re-prepare path. */
case ER_UNKNOWN_STMT_HANDLER:
return -1; /* reconnection error -> <0 */
default:
LM_CRIT("driver error (%i): %s\n", error, mysql_stmt_error(stmt));
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