Here Data Technology

Other

Zhongshan Winstar Electrical Co., Ltd.

Shenzhen Jinzhou Precision Technology Corporation

Jian Zhu

Bin Hao

Jingyao Zhang

Yu Ngok Li

Wei Bin Lin

Junli Liu

Qinghong Han

Zhi Zhuan Liao

Disclosed is a data encoding, decoding and recovering method of a distributed storage system for data protection of the distributed storage system. The methods include using local recoverable coding, and calling Reed-Solomon coding on data blocks obtained from divisions of file segments based on coding parameters to generate global coding blocks, locally coding to data blocks and global coding blocks respectively to generate local coding blocks. The methods can also include computing decoded block indices and recovered block indices according to current node state, reading block data of assistant node, and implementing decoding of file segments and recovery of failed blocks. The coding method of the present disclosure can reduce the amount of data that needs to be transmitted when recovering a failed node by increasing local coding blocks and speed up the node recovery speed.

Data encoding, decoding and recovering method for a distributed storage system

A method of data recovery for a distributed storage system is a method of recovering multiple failed nodes concurrently with the minimum feasible bandwidth when failed nodes exist in a distributed storage system. By means of selecting assistant nodes, obtaining helper data sub-blocks through computing the selected assistant nodes, then computing a repair matrix and finally multiple the repair matrix and the helper data sub-blocks, the missing data blocks are reconstructed; or the missing data blocks are reconstructed by decoding. The method is applicable to data recovery in the case of any number of failed nodes and any reasonable combinations of coding parameters. The data recovery herein can reach the theoretical lower limit of the minimum recovery bandwidth.

Methods for data recovery of a distributed storage system and storage medium thereof

Disclosed is a systems and methods of distributed data storage using multi-layers consistent hashing comprising: a plurality of storage nodes providing data storage and redundancy protection; a plurality of management nodes maintaining the properties of the storage nodes and mapping information from virtual groups to storage nodes; a plurality of monitor nodes maintaining the state of storage nodes and handling the changes of states of storage nodes including joining, decommissioning and failure; and one or more clients providing entries for applications or users to access the storage system. The storage nodes is in a hierarchical tree arrangement, and each storage node in each layer of the tree is allocated with a plurality of identities and configured for remaining hash space with consistency. Instead of sharing one hash space among all storage nodes, there are a plurality of hash spaces kept consistent in each layer of the storage hierarchical tree.

Systems and methods of handling node failure in a distributed data storage using multi-layer consistent hashing

The present disclosure discloses an integrated rotary cutting tool manufacturing device and method, the integrated rotary cutting tool manufacturing device comprises a workpiece transfer device, a machine body, a feeding device, grinding devices and a discharge device. The grinding devices comprise a rough grinding device used for carrying out primary grinding on a vertically arranged workpiece and a fine grinding device used for carrying out secondary grinding on the vertically arranged workpiece. The integrated rotary cutting tool manufacturing device is adopted by the rotary cutting tool manufacturing method. The device according to the present disclosure is compact in structure, high in machining efficiency and precision, and low in costs, the maximum values, the minimum values and the average values of the roundness and the concentricity of machined micro drill bits are closer to the standard values, and the stabilization process capability indexes of the roundness.

Integrated rotary cutting tool manufacturing device and method

Disclosed is a method of distributed data redundancy storage using consistent hashing, which is used for selection of pre-stored data in the distributed position in storage cluster. The method is implemented by establishing a logical topology for each storage node in a distributed storage system, determining the position of each node in a storage node sequence corresponding to each hash subspace by using consistent hashing, and then determining a number of data copies and each piece of stored data according to the redundant storage policy of pre-stored data; and storing each piece of stored data in a different storage node according to storage rules.

Method of distributed data redundancy storage using consistent hashing

Disclosed is a method of data concurrent recovery for a distributed storage system, that is, a method for synchronous repair of multiple failed nodes with a minimum recovery bandwidth when a node in a distributed storage system fails. First an assistant node is selected to get helper data sub-block, then the repair matrix related to the data block stored in the node to be repaired is constructed, and finally the lost data block is reconstructed by multiplying the repair matrix and the helper data helper data sub-block; the missing data block is reconstructed by decoding, wherein the node to be recovered includes all failed systematical nodes, or all or partly failed parity nodes. The method is applicable to concurrently recover multiple failed nodes at minimal recovery bandwidth, and the nodes to be recovered are selected according to the demand to reduce the recovery bandwidth as much as possible.

Methods of data concurrent recovery for a distributed storage system and storage medium thereof

The present invention discloses a quickly clampable and dismountable lamp connection structure, wherein a buckle linkage assembly that fastens the lamp housing body onto the fixed connecting seat in a dismountable manner is arranged between opposite junction surfaces of the fixed connecting seat and the lamp housing body, and comprises a locking groove, a hook that can snap into the locking groove in a resilient manner so that the lamp housing body is fastened on the fixed connecting seat, a linkage part that can stretch out or draw back and move together with the hook, and a guide slope for pushing the linkage part to move when the lamp housing body rotates relative to the fixed connecting seat, thereby driving the hook to retreat and break away from the locking groove.

Quickly clampable and dismountable lamp connection structure

A living tissue ligation device, comprising a clamp (), an operating device () and a conveying device (); the clamp () comprising an elastic clip () and a tightening tube () to receive the elastic clip () therein; the operating device () comprise a handle () and a slider () capable of sliding on the handle (); and the conveying device () comprises an outer connecting mechanism () and an inner connecting mechanism (). The device can be widely used at various positions in the alimentary canal, can be repeatedly opened and closed, and is simple to operate.

Living tissue ligation device

A clamping and ligation device, comprising a ligation unit (), a conveying unit (), a protective sleeve (), a connecting unit (), a operation unit (), and a traction unit (); the connecting unit () connects the conveying unit () with the ligation unit (), and can be disengaged to separate the conveying unit () from the ligation unit (); the traction unit () controls the ligation unit () via push and pull movement; the end of the traction unit () connected to the ligation unit () is breakable, so that the traction unit () can be broken away from the ligation unit () under a definite force; the protective sleeve pipe () can accommodate the whole ligation unit () therein, thus, during endoscope penetration, avoiding the damage to the endoscope tube wall and the increase of penetration force.

Growing community of inventors

Guangdong, China

Jian Zhu