Patent application number | Description | Published |
20080294701 | ITEM-SET KNOWLEDGE FOR PARTIAL REPLICA SYNCHRONIZATION - A system is disclosed for synchronizing partially-replicated collections while keeping synchronization overhead low by using the concept of item-set knowledge. Item-set knowledge uses knowledge fragments, which associate knowledge vectors with item-sets. An item-set consists of an explicitly represented list of items. In a partial replica, this item set may be the items known to a replica within which a filter is applied limiting the items known to some subset of the overall items in the collection. | 11-27-2008 |
20080320299 | ACCESS CONTROL POLICY IN A WEAKLY-COHERENT DISTRIBUTED COLLECTION - A system is disclosed for creating and implementing an access control policy framework in a weakly coherent distributed collection. A collection manager may sign certificates forming equivalence classes of replicas that share a specific authority. The collection manager and/or certain privileged replicas may issue certificates that delegate authority for control of item policy and replica policy. Further certificates may be signed that create one or more items, set policy for these one or more items, and define a set of operations authorized on the one or more items. The certificates issued according to the present system for creating and implementing a control policy framework cannot be modified or simply overridden. Once a policy certificate is issued, it may only be revoked by the collection manager or by a replica having revocation authority. | 12-25-2008 |
20090006489 | HIERARCHICAL SYNCHRONIZATION OF REPLICAS - A hierarchical system is disclosed for synchronizing partially-replicated collections that provides guaranteed paths of information to all replicas in a collection. Each partial replica is assigned a parent replica to act as a proxy on its behalf, and with which the replica synchronizes regularly. Each parent replica is responsible for one or more child replicas. Parent replicas have filters which are either the same as, or more inclusive than, their child replicas, and parent replicas thus store and synchronize all objects that are of interest to their one or more child replicas. | 01-01-2009 |
20090006495 | MOVE-IN/MOVE-OUT NOTIFICATION FOR PARTIAL REPLICA SYNCHRONIZATION - A system is disclosed for synchronizing partially-replicated collections using the concept of item-set knowledge and move-out notifications. Move-out notifications are provided to allow removal of changed items from replicas when the change in the item takes that item outside of the interest set of the replicas. | 01-01-2009 |
20090240719 | ACCUMULATING STAR KNOWLEDGE IN REPLICATED DATA PROTOCOL - A distributed system includes full and partial replicas of a set of data items that may be inserted, modified, or deleted by any replica. Replicas may occasionally synchronize with other arbitrarily chosen replicas to learn about updates. A replica's knowledge includes of one or more knowledge fragments, where each fragment indicates a set of items. A type of knowledge fragment, called a star knowledge fragment, contains versions associated with all items in the system. Star knowledge fragments are compact because the set of items stored at a replica need not be explicitly listed. Once all replicas know of all updates in the system, partial and full replicas will have the same compact star knowledge fragment. | 09-24-2009 |
20110016100 | MULTIPLE FIDELITY LEVEL ITEM REPLICATION AND INTEGRATION - A distributed system synchronizes replica devices with respect to items that may be inserted, modified, or deleted by any of the replica devices. Replicas may synchronize with other replicas to learn about updates to items. Each replica device may include a high-fidelity replication platform and/or a low-fidelity replication platform. The low-fidelity replication platforms may synchronize low-fidelity versions of items among the replica devices, and the high-fidelity replication platforms may synchronize high-fidelity versions of items among the replica devices. Each replica device may include a fidelity manager that copies high-fidelity versions of items from the high-fidelity replication platform, generates low-fidelity versions of the items from the high-fidelity versions of the items, and adds the low-fidelity versions of the items to the low-fidelity replication platforms. The fidelity managers may further integrate changes made to low-fidelity versions of items into the corresponding high-fidelity versions of the items. | 01-20-2011 |
20130188486 | DATA CENTER NETWORK USING CIRCUIT SWITCHING - A circuit-based digital communications network is provided for a large data center environment that utilizes circuit switching in lieu of packet switching in order to lower the cost of the network and to gain performance efficiencies. A method for transmitting data in such a network comprises sending a setup request for a path for transmitting the data to a destination node and then speculatively sending the data to the destination node before the setup request is completed. | 07-25-2013 |
20140164773 | OFFLINE DATA ACCESS USING TRUSTED HARDWARE - A cryptographically-secure component provides access-undeniability and verifiable revocation for clients with respect to downloaded content items from a server. A cryptographically-secure component is implemented in a client. When the client wants to purchase and download a content item from the server, the server requests an encryption key from the client. The client generates an encryption key that is bound to a state of the client that is associated with decrypting the content item. The server encrypts the content item using the encryption key and sends the encrypted content item to the client. Because the encryption key used to encrypt the content item is bound to the state associated with the client decrypting the content item, if the client desires to view the content item the client may first advance its state to the bound state to retrieve the decryption key. | 06-12-2014 |