Abstract: Embodiments of the present application provide a data local recovery method, a device and a storage medium. A global parity block and a local parity block in any data group of a data set are obtained by encoding a data block, and when any data block within the data group is lost, the data block can be recovered according to remaining data blocks, the global and local parity blocks. When the local parity block is lost, the local parity block can be recovered according to the data block within the data group. The local parity block includes encoding information of the global parity block, and when the global parity block is lost, the global parity block can be recovered according to the data block and the local parity block.

Abstract: Encoding methods based on erasure code are disclosed, and a distributed system, a device and a storage medium are provided. The method comprises: acquiring K data blocks of data to be processed; dividing the K data blocks into L data groups, wherein each data group at least comprises K encoding parameters respectively corresponding to the K data blocks, and K and L are integers greater than 1; and for each data group, performing encoding by using at least part of data blocks in other data groups and encoding parameters, which correspond to the at least part of data blocks, in the present data group, to generate a local reconstruction parity block of the present data group. The data groups and the local reconstruction parity blocks are stored in data nodes of a distributed system.

Abstract: A parity block generation method and apparatus. The method comprises: for a plurality of original data blocks for which parity blocks are to be generated, determining (102) a global coding matrix for the plurality of original data blocks; for each local domain that is obtained by dividing the plurality of original data blocks, determining (104) a local coding matrix of the local domain on the basis of the global coding matrix, wherein each local domain comprises original data blocks that belong to the local domain; and generating (106), on the basis of the global coding matrix, global parity blocks for the plurality of original data blocks, and generating, on the basis of the local coding matrix of each local domain, a local reconstruction parity block of each local domain, such that the global parity blocks have a derivation relationship with the local reconstruction parity block of each local domain.

Abstract: Embodiments of the present invention disclose a push information pre-selecting method and apparatus. The method includes: based on historical push data of push information including a plurality of push information items, determining a feature for calculating a predicted value, and a weight corresponding to the feature; calculating a standard deviation of the feature; determining a fluctuation probability of the standard deviation; calculating the predicted value based on the weight, the standard deviation, and the fluctuation probability, the standard deviation and the fluctuation probability being used for calculating a fluctuation value for correcting the weight; based on the predicted value, selecting push information items satisfying a preset condition; and pushing the selected push information items to a target user.