Status Codes

A sample solution as IoTDB requires registering the time series first before writing data is:

try {
    writeData();
} catch (SQLException e) {
  // the most case is that the time series does not exist
  if (e.getMessage().contains("exist")) {
      //However, using the content of the error message is not so efficient
      registerTimeSeries();
      //write data once again
      writeData();
  }
}

With Status Code, instead of writing codes like if (e.getErrorMessage().contains("exist")), we can simply use e.getErrorCode() == TSStatusCode.TIME_SERIES_NOT_EXIST_ERROR.getStatusCode().

Here is a list of Status Code and related message:

Status Code	Status Type	Meanings
200	SUCCESS_STATUS
201	INCOMPATIBLE_VERSION	Incompatible version
202	CONFIGURATION_ERROR	Configuration error
203	START_UP_ERROR	Meet error while starting
204	SHUT_DOWN_ERROR	Meet error while shutdown
300	UNSUPPORTED_OPERATION	Unsupported operation
301	EXECUTE_STATEMENT_ERROR	Execute statement error
302	MULTIPLE_ERROR	Meet error when executing multiple statements
303	ILLEGAL_PARAMETER	Parameter is illegal
304	OVERLAP_WITH_EXISTING_TASK	Current task has some conflict with existing tasks
305	INTERNAL_SERVER_ERROR	Internal server error
306	DISPATCH_ERROR	Meet error while dispatching
400	REDIRECTION_RECOMMEND	Recommend Client redirection
500	DATABASE_NOT_EXIST	Database does not exist
501	DATABASE_ALREADY_EXISTS	Database already exist
502	SERIES_OVERFLOW	Series number exceeds the threshold
503	TIMESERIES_ALREADY_EXIST	Timeseries already exists
504	TIMESERIES_IN_BLACK_LIST	Timeseries is being deleted
505	ALIAS_ALREADY_EXIST	Alias already exists
506	PATH_ALREADY_EXIST	Path already exists
507	METADATA_ERROR	Meet error when dealing with metadata
508	PATH_NOT_EXIST	Path does not exist
509	ILLEGAL_PATH	Illegal path
510	CREATE_TEMPLATE_ERROR	Create schema template error
511	DUPLICATED_TEMPLATE	Schema template is duplicated
512	UNDEFINED_TEMPLATE	Schema template is not defined
513	TEMPLATE_NOT_SET	Schema template is not set
514	DIFFERENT_TEMPLATE	Template is not consistent
515	TEMPLATE_IS_IN_USE	Template is in use
516	TEMPLATE_INCOMPATIBLE	Template is not compatible
517	SEGMENT_NOT_FOUND	Segment not found
518	PAGE_OUT_OF_SPACE	No enough space on schema page
519	RECORD_DUPLICATED	Record is duplicated
520	SEGMENT_OUT_OF_SPACE	No enough space on schema segment
521	SCHEMA_FILE_NOT_EXISTS	SchemaFile does not exist
522	OVERSIZE_RECORD	Size of record exceeds the threshold of page of SchemaFile
523	SCHEMA_FILE_REDO_LOG_BROKEN	SchemaFile redo log has broken
524	TEMPLATE_NOT_ACTIVATED	Schema template is not activated
600	SYSTEM_READ_ONLY	IoTDB system is read only
601	STORAGE_ENGINE_ERROR	Storage engine related error
602	STORAGE_ENGINE_NOT_READY	The storage engine is in recovery, not ready fore accepting read/write operation
603	DATAREGION_PROCESS_ERROR	DataRegion related error
604	TSFILE_PROCESSOR_ERROR	TsFile processor related error
605	WRITE_PROCESS_ERROR	Writing data related error
606	WRITE_PROCESS_REJECT	Writing data rejected error
607	OUT_OF_TTL	Insertion time is less than TTL time bound
608	COMPACTION_ERROR	Meet error while merging
609	ALIGNED_TIMESERIES_ERROR	Meet error in aligned timeseries
610	WAL_ERROR	WAL error
611	DISK_SPACE_INSUFFICIENT	Disk space is insufficient
700	SQL_PARSE_ERROR	Meet error while parsing SQL
701	SEMANTIC_ERROR	SQL semantic error
702	GENERATE_TIME_ZONE_ERROR	Meet error while generating time zone
703	SET_TIME_ZONE_ERROR	Meet error while setting time zone
704	QUERY_NOT_ALLOWED	Query statements are not allowed error
705	LOGICAL_OPERATOR_ERROR	Logical operator related error
706	LOGICAL_OPTIMIZE_ERROR	Logical optimize related error
707	UNSUPPORTED_FILL_TYPE	Unsupported fill type related error
708	QUERY_PROCESS_ERROR	Query process related error
709	MPP_MEMORY_NOT_ENOUGH	Not enough memory for task execution in MPP
710	CLOSE_OPERATION_ERROR	Meet error in close operation
711	TSBLOCK_SERIALIZE_ERROR	TsBlock serialization error
712	INTERNAL_REQUEST_TIME_OUT	MPP Operation timeout
713	INTERNAL_REQUEST_RETRY_ERROR	Internal operation retry failed
714	NO_SUCH_QUERY	Cannot find target query
715	QUERY_WAS_KILLED	Query was killed when execute
800	UNINITIALIZED_AUTH_ERROR	Failed to initialize auth module
801	WRONG_LOGIN_PASSWORD	Username or password is wrong
802	NOT_LOGIN	Not login
803	NO_PERMISSION	No permisstion to operate
804	USER_NOT_EXIST	User not exists
805	USER_ALREADY_EXIST	User already exists
806	USER_ALREADY_HAS_ROLE	User already has target role
807	USER_NOT_HAS_ROLE	User not has target role
808	ROLE_NOT_EXIST	Role not exists
809	ROLE_ALREADY_EXIST	Role already exists
810	ALREADY_HAS_PRIVILEGE	Already has privilege
811	NOT_HAS_PRIVILEGE	Not has privilege
812	CLEAR_PERMISSION_CACHE_ERROR	Failed to clear permission cache
813	UNKNOWN_AUTH_PRIVILEGE	Unknown auth privilege
814	UNSUPPORTED_AUTH_OPERATION	Unsupported auth operation
815	AUTH_IO_EXCEPTION	IO Exception in auth module
900	MIGRATE_REGION_ERROR	Error when migrate region
901	CREATE_REGION_ERROR	Create region error
902	DELETE_REGION_ERROR	Delete region error
903	PARTITION_CACHE_UPDATE_ERROR	Update partition cache failed
904	CONSENSUS_NOT_INITIALIZED	Consensus is not initialized and cannot provide service
905	REGION_LEADER_CHANGE_ERROR	Region leader migration failed
906	NO_AVAILABLE_REGION_GROUP	Cannot find an available region group
907	LACK_DATA_PARTITION_ALLOCATION	Lacked some data partition allocation result in the response
1000	DATANODE_ALREADY_REGISTERED	DataNode already registered in cluster
1001	NO_ENOUGH_DATANODE	The number of DataNode is not enough, cannot remove DataNode or create enough replication
1002	ADD_CONFIGNODE_ERROR	Add ConfigNode error
1003	REMOVE_CONFIGNODE_ERROR	Remove ConfigNode error
1004	DATANODE_NOT_EXIST	DataNode not exist error
1005	DATANODE_STOP_ERROR	DataNode stop error
1006	REMOVE_DATANODE_ERROR	Remove datanode failed
1007	REGISTER_DATANODE_WITH_WRONG_ID	The DataNode to be registered has incorrect register id
1008	CAN_NOT_CONNECT_DATANODE	Can not connect to DataNode
1100	LOAD_FILE_ERROR	Meet error while loading file
1101	LOAD_PIECE_OF_TSFILE_ERROR	Error when load a piece of TsFile when loading
1102	DESERIALIZE_PIECE_OF_TSFILE_ERROR	Error when deserialize a piece of TsFile
1103	SYNC_CONNECTION_ERROR	Sync connection error
1104	SYNC_FILE_REDIRECTION_ERROR	Sync TsFile redirection error
1105	SYNC_FILE_ERROR	Sync TsFile error
1106	CREATE_PIPE_SINK_ERROR	Failed to create a PIPE sink
1107	PIPE_ERROR	PIPE error
1108	PIPESERVER_ERROR	PIPE server error
1109	VERIFY_METADATA_ERROR	Meet error in validate timeseries schema
1200	UDF_LOAD_CLASS_ERROR	Error when loading UDF class
1201	UDF_DOWNLOAD_ERROR	DataNode cannot download UDF from ConfigNode
1202	CREATE_UDF_ON_DATANODE_ERROR	Error when create UDF on DataNode
1203	DROP_UDF_ON_DATANODE_ERROR	Error when drop a UDF on DataNode
1300	CREATE_TRIGGER_ERROR	ConfigNode create trigger error
1301	DROP_TRIGGER_ERROR	ConfigNode delete Trigger error
1302	TRIGGER_FIRE_ERROR	Error when firing trigger
1303	TRIGGER_LOAD_CLASS_ERROR	Error when load class of trigger
1304	TRIGGER_DOWNLOAD_ERROR	Error when download trigger from ConfigNode
1305	CREATE_TRIGGER_INSTANCE_ERROR	Error when create trigger instance
1306	ACTIVE_TRIGGER_INSTANCE_ERROR	Error when activate trigger instance
1307	DROP_TRIGGER_INSTANCE_ERROR	Error when drop trigger instance
1308	UPDATE_TRIGGER_LOCATION_ERROR	Error when move stateful trigger to new datanode
1400	NO_SUCH_CQ	CQ task does not exist
1401	CQ_ALREADY_ACTIVE	CQ is already active
1402	CQ_AlREADY_EXIST	CQ is already exist
1403	CQ_UPDATE_LAST_EXEC_TIME_ERROR	CQ update last execution time failed

All exceptions are refactored in the latest version by extracting uniform message into exception classes. Different error codes are added to all exceptions. When an exception is caught and a higher-level exception is thrown, the error code will keep and pass so that users will know the detailed error reason.
A base exception class "ProcessException" is also added to be extended by all exceptions.