Abstract: Disclosed are a method and a device for downloading a file. The method includes: when receiving a download request of a file, acquiring attribute information about the file, and learning information about the length of the file according to the attribute information about the file; when the length of the file goes beyond a preset value, segmenting the download request into at least two fragments of download requests; sending the at least two fragments of download requests to at least two data nodes to request to download corresponding fragments, and obtaining the at least two fragments; and according to the at least two fragments obtained by download, obtaining the file. By segmenting the download request into a plurality of fragments of requests, the present invention achieves the parallel download of the plurality of fragments of requests, thereby greatly improving the download efficiency of a file.

Abstract: The provided is a distributed file system, file access method and a client device. The file access method includes: accessing a file catalog stored by a master server, and obtaining routing information of a meta server associated with a to-be-accessed file from the master server; accessing the meta server according to the obtained routing information, and obtaining meta information of the to-be-accessed file from the meta server; and accessing the to-be-accessed file from multiple node servers according to the obtained meta information.

Abstract: Disclosed are a method and a device for downloading a file. The method includes: when receiving a download request of a file, acquiring attribute information about the file, and learning information about the length of the file according to the attribute information about the file; when the length of the file goes beyond a preset value, segmenting the download request into at least two fragments of download requests; sending the at least two fragments of download requests to at least two data nodes to request to download corresponding fragments, and obtaining the at least two fragments; and according to the at least two fragments obtained by download, obtaining the file. By segmenting the download request into a plurality of fragments of requests, the present invention achieves the parallel download of the plurality of fragments of requests, thereby greatly improving the download efficiency of a file.

Abstract: The invention relates to a road traffic control method and corresponding traffic facilities. The method includes: setting roads mounted or vehicles mounted devices for controlling queens passing; setting associated traffic facilities which assist controlling queens; guiding, including and controlling to vehicle flows in various directions by the above devices and facilities; arranging the vehicle queens into sequential array at the same time or by turns in roads and crosses according to preset procedure. By the method, the vehicle flows can pass continuously or non-continuously without crossing or with less crossing in multi-driveway road. The invention has small investment, wide application and can greatly improve the cross passing ability.

Abstract: The invention relates to a road traffic control method and corresponding traffic facilities. The method includes: setting roads mounted or vehicles mounted devices for controlling queens passing; setting associated traffic facilities which assist controlling queens; guiding, including and controlling to vehicle flows in various directions by the above devices and facilities; arranging the vehicle queens into sequential array at the same time or by turns in roads and crosses according to preset procedure. By the method, the vehicle flows can pass continuously or non-continuously without crossing or with less crossing in multi-driveway road. The invention has small investment, wide application and can greatly improve the cross passing ability.