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File sharing system and file sharing method

  • US 9,251,163 B2
  • Filed: 08/20/2014
  • Issued: 02/02/2016
  • Est. Priority Date: 04/15/2011
  • Status: Active Grant
First Claim
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1. A file sharing system comprising:

  • a plurality of master servers each configured to provide one or more master file systems each including a directory and a file each being an object; and

    a plurality of slave servers each configured to acquire a copy file system of a part or whole of a master file system provided by the plurality of master servers, wherein;

    a first slave server of the plurality of slave servers includes copy management information including entries each associating a master file system identifier, an identifier of a version of a master file system identified by the master file system identifier and an identifier of a slave server which checked out of a copy file system of a part or whole of the master file system identified by the master file system identifier;

    the first slave server acquires a first copy file system of a part of a first master file system of the one or more master file systems, the first copy file system including a stub-state object;

    the first slave server, using an identifier of the first master file system and an identifier of a version of the first master file system, searches the copy management information for a slave server to be queried regarding cached information for materializing the stub-state object and performs the searches simultaneously to verify the presence or absence of the cached information and issues an object acquisition to the slave server being the first to return a cache present designation, and the number of slave servers to be queried being based on a version of the copy management information;

    on condition that the search result indicates a slave server to be queried of the slave servers, the first slave server queries the slave server to be queried regarding the cached information for materialization;

    on condition that the slave server to be queried includes the information for materialization, the first slave server materializes the stub-state object using the information for materialization acquired from the slave server to be queried; and

    wherein, on condition that the information for materialization is not acquired from any slave server in the copy management information, the first slave server acquires the information for materialization from one of the plurality of master servers.

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