Reassignment of nodes during query execution

A query processing system, comprising:

• at least one processor;
• and
• a memory storing operational instructions that, when executed by the at least one processor, cause the query processing system to:
• initiate an execution of a query via a subset of a plurality of nodes assigned to execute the query in accordance with a query execution plan;
• after initiating the execution of the query, generate failure detection data indicating a first node included in the subset of the plurality of nodes based on determining execution condition data for the first node compares unfavorably to node execution condition requirements;
• generate node reassignment data based on the failure detection data by assigning a new node in the plurality of nodes to replace the first node in the query execution plan for a remainder of the execution of the query;
• and
• generate a resultant for the query in accordance with completion of the execution of the query, wherein at least a portion of the execution of the query is performed via the new node;
• wherein the query is executed in accordance with one query execution mode of a plurality of query execution modes, wherein the new node is assigned to replace the first node in the query execution plan for the remainder of the execution of the query based on resultant correctness requirement data of the one query execution mode indicating less than a strictest threshold correctness requirement of a plurality of threshold correctness requirements of the plurality of query execution modes, and wherein the node execution condition requirements are determined based on an execution success condition of the one query execution mode.

A non-transitory computer readable storage medium comprising:

• at least one memory section that stores operational instructions that, when executed by a processing module that includes a processor and a memory, cause the processing module to:
• initiate an execution of a query via a subset of a plurality of nodes assigned to execute the query in accordance with a query execution plan;
• after initiating the execution of the query, generate failure detection data indicating a first node included in the subset of the plurality of nodes based on determining execution condition data for the first node compares unfavorably to node execution condition requirements;
• generate node reassignment data based on the failure detection data by assigning a new node in the plurality of nodes to replace the first node in the query execution plan for a remainder of the execution of the query;
• and
• generate a resultant for the query in accordance with completion of the execution of the query, wherein at least a portion of the execution of the query is performed via the new node;
• wherein the query is executed in accordance with one query execution mode of a plurality of query execution modes, wherein the new node is assigned to replace the first node in the query execution plan for the remainder of the execution of the query based on resultant correctness requirement data of the one query execution mode indicating less than a strictest threshold correctness requirement of a plurality of threshold correctness requirements of the plurality of query execution modes, and wherein the node execution condition requirements are determined based on an execution success condition of the one query execution mode.