# eXtremeDB HA Error Codes

> The following error codes indicate non-fatal error conditions that might be returned by the eXtremeDB High Availability runtime while processing HA operations:

> Mnemonic Constant Name
> Value
> Meaning
> MCO_E_HA
> 400
> HA Error Code base
> MCO_E_HA_PROTOCOLERR
> 401
> Error in protocol
> MCO_E_HA_TIMEOUT
> 402
> Timeout
> MCO_E_HA_IOERROR
> 403
> Input / output error
> MCO_E_HA_MAXREPLICAS
> 404
> Too many replicas requested
> MCO_E_HA_INIT
> 405
> Unable to initialize HA
> MCO_E_HA_RECEIVE
> 406
> Error receiving HA message
> MCO_E_HA_NO_AUTO_OID
> 407
> No `auto_oid` index declared in the database schema
> MCO_E_HA_NOT_INITIALIZED
> 408
> HA was not initialized
> MCO_E_HA_INVALID_MESSAGE
> 409
> Invalid HA message ID
> MCO_E_HA_INVALID_PARAMETER
> 410
> Invalid parameter
> MCO_E_HA_INVCHANNEL
> 411
> Invalid channel handler
> MCO_E_HA_INCOMPATIBLE_MODES
> 412
> Incompatible HA mode
> MCO_E_HA_CLOSE_TEMP
> 413
> Close temporary multicast channel
> MCO_E_HA_MULTICAST_NOT_SUPP
> 414
> Multicast is not configured
> MCO_E_HA_HOTSYNCH_NOT_SUPP
> 415
> Hot synchronization is not configured
> MCO_E_HA_ASYNCH_NOT_SUPP
> 416
> Asynchronous replication is not configured
> MCO_E_HA_NO_MEM
> 417
> Not enough memory to create communication layer descriptors
> MCO_E_HA_BAD_DESCRIPTOR
> 418
> `ha_t` structure is not cleared before creation of base channel
> MCO_E_HA_CANCEL
> 419
> Connection was canceled
> MCO_E_HA_WRONG_DB_MAGIC
> 420
> Wrong DB magic value
> MCO_E_HA_COMMIT
> 421
> Master commit error, break commit loop
> MCO_E_HA_MANYREPLICAS
> 422
> Attempt to attach too many replicas
> MCO_E_NOT_MASTER
> 423
> Master-mode was not set
> MCO_E_HA_STOPPED
> 424
> Replication was stopped
> MCO_E_HA_NOWRITETXN
> 425
> Read-write transactions are prohibited on replica
> MCO_E_HA_PM_BUFFER
> 426
> Page memory buffer error
> MCO_E_HA_NOT_REPLICA
> 427
> Not Currently in replica-mode
> MCO_E_HA_BAD_DICT
> 428
> Master's db dictionary is incompatible with replica's
> MCO_E_HA_BINEV_NOT_SUPP
> 429
> Binary schema evolution is not configured
> MCO_E_HA_CHANNEL_NOT_REGISTERED
> 430
> Channel implementation is not registered
> MCO_E_HA_DDL_NOT_SUPPORTED
> 431
> DDL is not supported by HA
> MCO_E_HA_NO_QUORUM
> 432
> Number of active replicas is less than `master_params::quorum`
> MCO_S_HA_REPLICA_DETACH
> 433
> Replica was detached during transaction commit
> Invalid return codes
> 432-499
> Values between 432 and 499 are not valid eXtremeDB return codes

> Related Topics