Patent ID: 9348847
Filing Date: 2016-05-24
CPC Classification: G06F

Claim Text:
1. A data access control apparatus that controls access to data stored in a plurality of storage nodes, comprising: a processor configured to perform a procedure comprising: determining, when a reference condition and a first reference request are received, whether the reference condition is registered in a management information table; transmitting, if the reference condition is not registered in the management information table, the reference condition and the first reference request to all of the plurality of storage nodes; determining a first storage node which does not transmit data matching the reference condition in response to the first reference request among the plurality of storage nodes; registering identification information of the first storage node in the management information table in association with the reference condition; determining, when the reference condition and a second reference request are received after the registering, whether the reference condition is registered in the management information table; and transmitting, when determining that the reference condition is registered in the management information table in association with the first storage node, the reference condition and the second reference request to a second storage node different from the first storage node in the plurality of storage nodes.