Spatial search using key-value store
A spatial search may be performed using representations of geometric shapes stored in a key-value store. A request to perform a spatial search may be received, the request including a geometric shape composed of one or more points. The points of the geometrical shape may be translated into one or more spatial indexes representing spatial cells using a space-filling curve. A key-value store may then be incrementally searched for each spatial index to identify spatial cells intersecting the geometric shape for which other known geometric shapes exist. The key-value store may then be searched to identify the known geometric shapes intersecting the geometric shape included in the search.
1. A system, comprising:
a key-value data store comprising a plurality of spatial cell indexes and a plurality of cell membership indexes;
at least one processor; and
a memory, storing program instructions that when executed cause the at least one processor to implement a query processor configured to:
receive a request from a client to perform a search, the request identifying one or more indexes encoded using a space-filling curve that defines points within a multi-dimensional space as locations along a single-dimensional path that fills the multi-dimensional space;
for individual indexes of the one or more indexes:
apply respective sliding windows to the individual indexes to subdivide respective searches of the individual indexes into respective pluralities of search ranges; and
perform respective pluralities of queries of a key-value store using individual ones of the respective pluralities of search ranges to identify cells intersecting the respective individual indexes; and
send a response to the request to perform the search, the response based at least in part on the identified cells for the of the one or more indexes.
2. The system of claim 1 , wherein the requested search comprises a geometric shape, and wherein the one or more indexes are identified according to the geometric shape.
3. The system of claim 2 , wherein the response comprises one or more geometric shapes that are members of the identified cells, and wherein the query processor is further configured to query the key-value store to determine the one or more geometric shapes, the key-value store further comprising a plurality of cell membership indexes.
4. The system of claim 1 , wherein the receiving, applying, performing and sending are performed by a geofencing service that supports a plurality of clients, and wherein at least one of the plurality of cell indexes comprises an identifier associated with a client of the plurality of clients submitting the request.
5. A method, comprising:
receiving a request from a client to perform a search, the request identifying one or more indexes encoded using a space-filling curve that defines points within a multi-dimensional space as locations along a single-dimensional path that fills the multi-dimensional space;
for individual indexes of the one or more indexes:
applying respective sliding windows to the individual indexes to subdivide respective searches of the individual indexes into respective pluralities of search ranges; and
performing respective pluralities of queries of a key-value store using individual ones of the respective pluralities of search ranges to identify cells intersecting the respective individual indexes; and
sending a response to the request to perform the search, the response based at least in part on the identified cells for the of the one or more indexes.
6. The method of claim 5 , wherein the requested search comprises a geometric shape, and wherein the one or more indexes are identified according to the geometric shape.
7. The method of claim 6 , wherein the geometric shape comprises multiple points and wherein the spatial search identifies geometric shapes that contain or intersect the geometric shape.
8. The method of claim 6 , wherein the response comprises one or more geometric shapes that are members of the identified cells, and wherein the method further comprises querying the key-value store to determine the one or more geometric shapes, the key-value store further comprising a plurality of cell membership indexes.
9. The method of claim 6 , wherein the geometric shape is a point, and wherein the search identifies one or more geometric shapes that contain or intersect the point.
10. The method of claim 5 , wherein the geometric shape comprises two or more spatial dimensions.
11. The method of claim 5 , wherein the spatial search is a spatiotemporal search.
12. The method of claim 5 , wherein the receiving, the identifying, the querying and the sending are performed by a geofencing service, wherein the geofencing service supports a plurality of clients, and wherein at least one of the plurality of cell indexes comprises an identifier associated with the client of the plurality of clients submitting the request.
13. One or more non-transitory, computer-readable storage media, storing program instructions that when executed on or across one or more computing devices cause the one or more computing devices to implement:
receiving a request from a client to perform a search, the request identifying one or more indexes encoded using a space-filling curve that defines points within a multi-dimensional space as locations along a single-dimensional path that fills the multi-dimensional space;
for individual indexes of the one or more indexes:
applying respective sliding windows to the individual indexes to subdivide respective searches of the individual indexes into respective pluralities of search ranges; and
performing respective pluralities of queries of a key-value store using individual ones of the respective pluralities of search ranges to identify cells intersecting the respective individual indexes; and
sending to the client a response to the request to perform the spatial search based at least in part on the cells for the of the one or more indexes.
14. The one or more non-transitory, computer-readable storage media of claim 13 , wherein the requested search comprises a geometric shape, and wherein the one or more indexes are identified according to the geometric shape.
15. The one or more non-transitory, computer-readable storage media of claim 14 , wherein the geometric shape comprises multiple points and wherein the spatial search identifies geometric shapes that contain or intersect the geometric shape.
16. The one or more non-transitory, computer-readable storage media of claim 14 , wherein the response comprises one or more geometric shapes that are members of the identified cells, and wherein the method further comprises querying the key-value store to determine the one or more geometric shapes, the key-value store further comprising a plurality of cell membership indexes.
17. The one or more non-transitory, computer-readable storage media of claim 14 , wherein the geometric shape is a point, and wherein the search identifies one or more geometric shapes that contain or intersect the point.
18. The one or more non-transitory, computer-readable storage media of claim 13 , wherein the geometric shape comprises two or more spatial dimensions.
19. The one or more non-transitory, computer-readable storage media claim 13 , wherein the spatial search is a spatiotemporal search.
20. The one or more non-transitory, computer-readable storage media of claim 13 , wherein the receiving, the identifying, the querying and the sending are performed by a geofencing service, wherein the geofencing service supports a plurality of clients, and wherein at least one of the plurality of cell indexes comprises an identifier associated with the client of the plurality of clients submitting the request.