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A system and method for reducing the amount of data transferred during streaming of an application upgrade. The system includes a server that streams application upgrades to a client. The client determines that an application upgrade is available and receives a first map from the server that corresp

A system and method for reducing the amount of data transferred during streaming of an application upgrade. The system includes a server that streams application upgrades to a client. The client determines that an application upgrade is available and receives a first map from the server that corresponds to an upgraded version of the application. The client generates a second map of the currently installed application. The client compares the first map to a second map that corresponds to the application currently installed on the client to determine that one or more data blocks corresponding to the upgraded version of the application are not present in the application currently installed on the client. The client requests the one or more data blocks from the server. Both maps include entries that include data describing a size, a location, and a hash value of a corresponding data block.

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1. A computing system comprising: a client; anda server configured to stream application upgrades to the client;wherein the client is configured to: determine that an upgrade to an application currently installed on the client is available;receive a first map from the server that corresponds to an u

1. A computing system comprising: a client; anda server configured to stream application upgrades to the client;wherein the client is configured to: determine that an upgrade to an application currently installed on the client is available;receive a first map from the server that corresponds to an upgraded version of the application, wherein the upgraded version of the application includes a first data block and a second data block that differ from corresponding first and second data blocks in the application currently installed on the client;determine which data blocks of the upgraded version of the application are needed for execution on the client, wherein said determining includes determining that the first data block is needed and the second data block is not needed;compare the first map to a second map that corresponds to the application currently installed on the client to determine that one or more of the data blocks of the upgraded version of the application that are needed for execution on the client are not present in the application currently installed on the client; andrequest the one or more data blocks from the server, wherein the one or more data blocks include the first data block, wherein the client is configured to not request the second data block from the server. 2. The computing system of claim 1, wherein: the first and second maps each include a plurality of entries;entries in the first map correspond to data blocks that correspond to the upgraded version of the application;entries in the second map correspond to data blocks that correspond to the application currently installed on the client; andeach entry includes data describing a size, a location, and a hash value of a corresponding data block. 3. The computing system of claim 2, wherein: said one or more data blocks comprise variable sized portions of a data file; anda boundary defining a size of a given data block is determined by identifying that a predetermined pattern of data exists in the data file. 4. The computing system of claim 1, wherein: the upgraded version of the application includes a plurality of files; andthe first map includes a plurality of separate maps, each of which corresponds to a respective one of the plurality of files. 5. The computing system of claim 1, wherein in performing said determining which data blocks of the upgraded version of the application are needed, the client is further configured to receive information from the server identifying data blocks of the upgraded version of the application that are needed for execution on the client. 6. The computing system of claim 1, wherein in performing said determining that the upgrade to the currently installed application is available, the client is further configured to request upgrade information from the server in response to a user attempting to execute the currently installed application. 7. A computer-implemented method for upgrading an application, the method comprising: determining that an upgrade to a currently installed application is available;receiving a first map from a server, wherein the first map corresponds to an upgraded version of the application, wherein the upgraded version of the application includes a first data block and a second data block that differ from corresponding first and second data blocks in the currently installed application;determine which data blocks of the upgraded version of the application are needed for execution of the upgraded version of the application, wherein said determining includes determining that the first data block is needed and the second data block is not needed;comparing the first map to a second map that corresponds to the currently installed application to determine that one or more of the data blocks of the upgraded version of the application that are needed for execution are not present in the currently installed application; and;requesting the one or more data blocks from the server, wherein the one or more data blocks include the first data block, wherein the second data block is not requested from the server. 8. The method of claim 7, wherein: the first and second maps each include a plurality of entries;entries in the first map correspond to data blocks that correspond to the upgraded version of the application;entries in the second map correspond to data blocks that correspond to the currently installed application; andeach entry includes data describing a size, a location, and a hash value of a corresponding data block. 9. The method of claim 8, wherein: said one or more data blocks comprise variable sized portions of a data file; anda boundary defining a size of a given data block is determined by identifying that a predetermined pattern of data exists in the data file. 10. The method of claim 7, wherein: the upgraded version of the application includes a plurality of files; andthe first map includes a plurality of separate maps, each of which corresponds to a respective one of the plurality of files. 11. The method of claim 7, wherein said determining which data blocks of the upgraded version of the application are needed comprises receiving information from the server identifying data blocks of the upgraded version of the application that are needed for execution of the upgraded version of the application. 12. The method of claim 7, wherein said determining that the upgrade to the currently installed application is available comprises requesting upgrade information from the server in response to a user attempting to execute the currently installed application. 13. A non-transitory computer readable storage medium storing program instructions executable by a client computing system to: determine that an upgrade to an application currently installed on the client computing system is available;receive a first map from a server that corresponds to an upgraded version of the application, wherein the upgraded version of the application includes a first data block and a second data block that differ from corresponding first and second data blocks in the application currently installed on the client computing system;determine which data blocks of the upgraded version of the application are needed for execution on the client computing system, wherein said determining includes determining that the first data block is needed and the second data block is not needed;compare the first map to a second map that corresponds to the application currently installed on the client computing system to determine that one or more of the data blocks of the upgraded version of the application that are needed for execution on the client computing system are not present in the application currently installed on the client computing system; andrequest the one or more data blocks from the server, wherein the one or more data blocks include the first data block, wherein the second data block is not requested from the server. 14. The non-transitory computer readable storage medium of claim 13, wherein: the first and second maps each include a plurality of entries;entries in the first map correspond to data blocks that correspond to the upgraded version of the application;entries in the second map correspond to data blocks in that correspond to the currently installed application; andeach entry includes data describing a size, a location, and a hash value of a corresponding data block. 15. The non-transitory computer readable storage medium of claim 14, wherein: said one or more data blocks comprise variable sized portions of a data file; anda boundary defining a size of a given data block is determined by identifying that a predetermined pattern of data exists in the data file. 16. The non-transitory computer readable storage medium of claim 13, wherein: the upgraded version of the application includes a plurality of files; andthe first map includes a plurality of separate maps, each of which corresponds to a respective one of the plurality of files. 17. The non-transitory computer readable storage medium of claim 13, wherein in performing said determining which data blocks of the upgraded version of the application are needed, the program instructions are further executable by the client computing system to receive information from the server identifying data blocks of the upgraded version of the application that are needed for execution on the client computing system.