Abstract: Disclosed systems, methods and components or features thereof generally enable redesign of a legacy non-IoT device or appliance into an IoT device and incorporation into an IoT system. A communication module receives from an appliance a message with which the IoT system identifies the appliance. The communication module is provided with appliance-specific data with which it can control the appliance as an IoT device. A parser in an IoT platform uses rules and a schema to parse the appliance messages. New rules can be added for handling new communication modules for new appliances. Other features are also described.

Abstract: Disclosed systems, methods and components or features thereof generally enable redesign of a legacy non-IoT device or appliance into an IoT device and incorporation into an IoT system. A communication module receives from an appliance a message with which the IoT system identifies the appliance. The communication module is provided with appliance-specific data with which it can control the appliance as an IoT device. A parser in an IoT platform uses rules and a schema to parse the appliance messages. New rules can be added for handling new communication modules for new appliances. Other features are also described.

Abstract: A data processing apparatus, comprising a metadata store storing information about files that are stored in a distributed data storage system, and comprising a class database; one or more processing units; logic configured for receiving and storing in the class database a definition of a class of data storage servers comprising one or more subclasses each comprising one or more server selection criteria; associating the class with one or more directories of the data storage system; in response to a data client storing a data file in a directory, binding the class to the data file, determining and storing a set of identifiers of one or more data storage servers in the system that match the server selection criteria, and providing the set of identifiers to the data client.

Abstract: A data processing apparatus, comprising a metadata store storing information about files that are stored in a distributed data storage system, and comprising a class database; one or more processing units; logic configured for receiving and storing in the class database a definition of a class of data storage servers comprising one or more subclasses each comprising one or more server selection criteria; associating the class with one or more directories of the data storage system; in response to a data client storing a data file in a directory, binding the class to the data file, determining and storing a set of identifiers of one or more data storage servers in the system that match the server selection criteria, and providing the set of identifiers to the data client.

Abstract: A data processing apparatus, comprising a metadata store storing information about files that are stored in a distributed data storage system, and comprising a class database; one or more processing units; logic configured for receiving and storing in the class database a definition of a class of data storage servers comprising one or more subclasses each comprising one or more server selection criteria; associating the class with one or more directories of the data storage system; in response to a data client storing a data file in a directory, binding the class to the data file, determining and storing a set of identifiers of one or more data storage servers in the system that match the server selection criteria, and providing the set of identifiers to the data client.

Abstract: A method for notifying an application coupled to a distributed file system is described. A command for a file for a distributed file system is received. The distributed file system stores portions of files across a plurality of distinct physical storage locations. The command for the file is compared with a notification table of the distributed file system of the distributed file system. At least one application communicates with the distributed file system. The notification system notifies the corresponding application associated with the command with the notification system.

Abstract: A data processing apparatus, comprising a metadata store storing information about files that are stored in a distributed data storage system, and comprising a class database; one or more processing units; logic configured for receiving and storing in the class database a definition of a class of data storage servers comprising one or more subclasses each comprising one or more server selection criteria; associating the class with one or more directories of the data storage system; in response to a data client storing a data file in a directory, binding the class to the data file, determining and storing a set of identifiers of one or more data storage servers in the system that match the server selection criteria, and providing the set of identifiers to the data client.

Abstract: A method for notifying an application coupled to a distributed file system is described. A command for a file for a distributed file system is received. The distributed file system stores portions of files across a plurality of distinct physical storage locations. The command for the file is compared with a notification table of the distributed file system of the distributed file system. At least one application communicates with the distributed file system. The notification system notifies the corresponding application associated with the command with the notification system.