Declarative cluster management

A method, comprising:

• receiving, at a processor, a planning indication of a declaratively-described operation by a master device of a target massively parallel processing (MPP) database, wherein:
• the declaratively-described operation is described using one or more declarative descriptions;
• the one or more declarative descriptions include a first mid-operation state of a plurality of mid-operation states of the declaratively-described operation, and metadata of each of the plurality of mid-operation states;
• and
• the metadata includes (i) one or more types of devices in the target MPP database which would be affected by each of the plurality of mid-operation states, including a first affected device type of the first mid-operation state, and (ii) a condition of each of the plurality of mid-operation states;
• and
• in response to receiving the planning indication and while the master device is in a planning mode:
• using the processor to determine, without performing the declaratively-described operation on the target MPP database, one or more affected devices in the target MPP database which would be affected by the first mid-operation state if the declaratively-described operation were performed based at least in part on the first set of affected device types, including by processing the declaratively-described operation using one or more declarative primitives stored in the master device in addition to determining the plurality of mid-operation states, wherein the processing includes:
• parsing a structure with one or more components included in the declaratively-described operation from the one or more declarative descriptions in order to obtain the metadata;
• building an internal structure which comprises a sequence of the plurality of mid-operation states and the metadata from parsing the structure with the one or more components;
• and
• identifying the plurality of mid-operation states and the one or more affected devices from the internal structure;
• and
• displaying the plurality of mid-operation states, including the first mid-operation state and the one or more affected devices via a graphical user interface.

A computer program product, the computer program product comprising a non-transitory computer readable storage medium that stores computer instructions which when executed cause a hardware processor to:

• receiving a planning indication of a declaratively-described operation by a master device of a target massively parallel processing (MPP) database, wherein:
• the declaratively-described operation is described using one or more declarative descriptions;
• the one or more declarative descriptions include a first mid-operation state of a plurality of mid-operation states of the declaratively-described operation, and metadata of each of the plurality of mid-operation states;
• and
• the metadata includes (i) one or more types of devices in the target MPP database which would be affected by each of the plurality of mid-operation states, including a first affected device type of the first mid-operation state, and (ii) a condition of each of the plurality of mid-operation states;
• and
• in response to receiving the planning indication and while the master device is in a planning mode:
• determining, without performing the declaratively-described operation on the target MPP database, one or more affected devices in the target MPP database which would be affected by the first mid-operation state if the declaratively-described operation were performed based at least in part on the first set of affected device types, including by processing the declaratively-described operation using one or more declarative primitives stored in the master device in addition to determining the plurality of mid-operation states, wherein the processing includes:
• parsing a structure with one or more components included in the declaratively-described operation from the one or more declarative descriptions in order to obtain the metadata;
• building an internal structure which comprises a sequence of the plurality of mid-operation states and the metadata from parsing the structure with the one or more components;
• and
• identifying the plurality of mid-operation states and the one or more affected devices from the internal structure;
• and
• displaying the plurality of mid-operation states, including the first mid-operation state and the one or more affected devices via a graphical user interface.