52results about How to "Solve the overload" patented technology

The invention relates to a computer HDFS field and discloses an improved method aimed at small files of an HDFS. Partial authority of a Namenode is delegated to a Datanode which caches element data information of part of small files and the Datanode is used for processing the writing and reading request of most small files. Burdens of the Namenode are reduced to the utmost. The new processing method is provided for solving the problem that the efficiency in processing the small files by the HDFS is low. The improved method aimed at the small files of the HDFS can effectively solve the problem that burdens of a single node, namely the Datanode are excessively large and pressure of the small files is distributed to the Datanode. Thus, large file and small file processing efficiency and performance of the integral large data processing colony are quite ideal.

The invention provides a high-concurrency scene processing method and device based on a Redis and Kafka online snap-up system; the method comprises the following steps: generating a login token basedon a user login request, writing the login token into caches of front-end Cookie and rear-end Redis, checking whether the front-end login token is matched with the rear-end login token; if not, returning an operation failure result; if yes, judging whether the user login token is valid; if not, returning an operation failure result; if yes, judging whether a commodity lock of a corresponding commodity is obtained or not; if not, returning an operation failure result; if yes, pushing request data of snap-up success to a Kafka information queue. According to the method and the device in the invention, loading pressure of a server and a database is effectively reduced through current-limiting peak-clipping processing; a large number of concurrent requests can be borne in short time; the throughput capacity of the cluster is greatly increased; through front-rear end check on the number of user access times, a cheating user can be quickly found out, so that the event is guaranteed to be carried out stably and fairly.

The embodiment of the invention provides a data reading method and device and a distributed storage system. The data reading method comprises the steps that a server where a primary copy is located receives a data reading request of a user; the server where a copy with the smallest load is located is selected according to load information of servers where all copies are located; if the server where the primary copy is located is not the server with the smallest load, the data reading request is sent to a server where a standby copy with the smallest load is located, so that data reading operation is carried out; data read by the server where the standby copy with the smallest load is located is received and shown to the user. According to the technical scheme, the server where the copy with the smallest load is located is selected for data reading operation, data reading operation is not all carried out by the server where the primary copy is located, therefore, load balance of the servers where the copies are located can be achieved, data reading efficiency is improved, and the problems of resource waste of the server where the standby copy is located and too heavy loads of the server where the primary copy is located in the prior art are solved.

The embodiment of the invention discloses a database synchronization method and device, a storage medium and a terminal. According to the invention, when the archived log in the source database is updated, an incremental log record in the archived log file is obtained, a plurality of SQL statements are generated according to each incremental log record, the plurality of SQL statements are sent toa target database, then, the target database is operated based on the SQL statement; in order to solve the problem that in the prior art, the target database is overloaded due to the fact that the target database inquires the source database in a polling mode, the incremental log in the archived log file is obtained from the source database and sent to the source database on the basis of the incremental log, so that the inquiry expenditure of the source database is reduced.

The invention provides a performance testing system and method for an MS (Media Server) clustered system. The performance testing system comprises an MS clustered system, a set top box simulating device, IPQAM (Internet Protocol Quadrature Amplitude Modulation) equipment and a playing terminal; the set top box simulating device is used for simulating a test case and analyzing relevant performances of the MS clustered system according to time information on signalling interaction between the set top box simulating device and the MS clustered system; and the playing terminal is used for receiving and playing a media stream which is selected and sent by the MS clustered system according to a request of the set top box simulating device, and obtaining performance data of the MS clustered system according to a playing result. According to the performance testing system provided by the invention, a media stream playing process and a signalling processing process can be separated, the problem of overweight load of a testing machine in the traditional testing system is solved, and the analysis and the processing to the media stream are facilitated; and the set top box simulating device in the system can be used for simulating a plurality of set top boxes, so that the number of user loads contained by the test case is greatly increased, and the testing cost is greatly saved.

The multi-motor oil-free dry frame head and frame tail drafting drive system for ring spinning frame includes front roller motor, front roller gear box, middle and rear roller motor, middle and rear roller gear box, and three roller trains. The front roller motor is connected via a synchronizing belt to the front roller gear box, and the two output shafts of the front roller gear box are connected via synchronizing belts to the right and left front rollers separately. The middle and rear roller motor is connected via a synchronizing belt to the middle and rear roller gear box, and the four output shafts of the middle and rear roller gear box are connected via synchronizing belts to the right and left middle rollers and right and left rear rollers separately. The present invention adopts triphase permanent magnetic sync motor for driving and open-loop control, and has simple structure, smooth driving, high precision, easy regulation in spinning process and expanded technological application range.

The invention discloses a big data security framework system based on identity authentication, and relates to the technical field of big data security. The system comprises at least one big data server, the big data server is utilized to distribute the intelligent cards to the clients; the big data server creates a public key, defines operational rules, the big data server acquires an identifier and a client password of the client; a secret key needing to be authenticated of the client is encrypted by utilizing the public secret key and the identifier, the identifier and the client password are encrypted by utilizing an operation rule, the random parameter is simultaneously encrypted, and the secret key needing to be authenticated of the client, the encrypted identifier and the client password, the encrypted random parameter and the operation rule are put into the intelligent card to be sent to the client; and the big data server and the client are used for mutual authentication through the intelligent card so as to establish a session.

The invention discloses a data gathering method with privacy protection and load balancing in smart grid. Sensitive data generated by a user is disturbed in the smart ammeter end by means of a randomized response technology, the data is compressed and transmitted by a compressed sensing technology, and a reconstruction recovery algorithm is used to gather privacy data. Compared with a common centralized data gathering privacy protection method, the method of the invention can ensure the data effectiveness and improve the privacy protection degree. In the realization end of the method, computing in the local end includes simple mathematical operation but not complex operation as encryption and decryption, and power consumption of the smart ammeter is reduced greatly.

The invention relates to a walking mechanism of a bridge detection vehicle and the bridge detection vehicle. The walking mechanism of the bridge detection vehicle comprises a frame, a first oil cylinder, a second oil cylinder and a walking part; one end of the first oil cylinder is hinged to the frame, the other end of the first oil cylinder is hinged to the walking part, one end of the second oil cylinder is hinged to the frame, the other end of the second oil cylinder is hinged to a cylinder barrel of the first oil cylinder, the second oil cylinder drives the first oil cylinder to be obliquely and upwards lifted or to be downwards vertical to the ground, and the first oil cylinder drives the walking part to be upwards retracted or downwards grounded. Accordingly, the phenomenon that the problem that the on-vehicle rotary space is influenced due to the fact that the stroke of a single oil cylinder is too long is generated for meeting the rising height requirements can be avoided, and the problems that too large loads are generated at the hinged joints, and a local structure is cracked and damaged can be solved.

The invention relates to spraying equipment, in particular to a series connection nine-degree-of-freedom spraying robot. The spraying robot comprises a work execution mechanism, a work positioning mechanism and an auxiliary supporting mechanism, wherein the work execution mechanism is connected with the work positioning mechanism in series. According to the series connection nine-degree-of-freedomspraying robot, a form in which a 9R main body structure and an auxiliary supporting device are combined is adopted in the aspect of the structure, so that the operation flexibility is met, and the problem that part of the joint load is too large is solved; a special 9-shaft series connection design is adopted in the aspect of motion space so that the robot ca enter a semi-closed space for spraying operation, and a larger flexible working space is achieved; in the aspect of driving control, the joint control is easy, and different modes of control schemes can be realized; the working positioning mechanism and the auxiliary supporting mechanism are controlled in a cooperative mode, and the work execution mechanism is independently controlled; and fixed region detection and trajectory prediction are combined on the anti-collision design.

The invention belongs to the technical field of automobile bus automatic diagnosis and relates to a fault detection system and method for a bus to cyclically send fault codes of a controller, and mainly aims to cyclically send the fault codes. The system comprises a fault detection module and a fault sending module. The system is characterized in that the fault detection module is used for detecting fault states of all fault nodes of the controller; the fault sending module is used for sending fault information of all fault nodes of the controller to a serial bus according to a detection result of the fault detection module; and the duration of occupying the bus by the fault information of fault nodes with the faults is longer than the duration of occupying the bus by the fault information of fault nodes without faults. According to the method and the device, the fault codes are circularly sent, the problem that the network load is too large when multiple pieces of fault information are sent is solved, and the time of sending the fault information of the fault nodes occupying the serial bus is longer than the time of sending the fault information of the fault nodes without the faults.

The embodiment of the invention discloses a method and system for realizing load balancing and switching of uplink and downlink data of a mobile node (MN). The method includes the following steps that: a bidirectional tunnel is established between each local mobility anchor (LMA) and mobile access gateways (MAG); each local mobility anchor (LMA) automatically checks a load status at preset time intervals and sends the load status of the local mobility anchor (LMA) itself to a route management entity (RMS); the route management entity (RMS) receives the load status of each local mobility anchor (LMA) and stores the load status to a load list maintained by the route management entity (RMS) itself; the route management entity (RMS) traverses the load list maintained by the route management entity (RMS) itself, and adjusts data forwarding paths of the mobile access gateways (MAG) in real time according to the load status of each local mobility anchor (LMA); when the mobile node (MN) is switched to a current mobile access gateway (MAG), the current mobile access gateway (MAG) completes standard proxy binding update (PBU)/proxy binding acknowledgement (PBA) switch, and then, forwards routing update signaling to each local mobility anchor (LMA) through the route management entity (RMS); and each local mobility anchor (LMA) adjusts corresponding routing items respectively and forwards obtained data of the mobile node (MN) to the current mobile access gateway (MAG) through a tunnel portal. The embodiment of the invention also discloses a system for realizing load balancing and switching of uplink and downlink data of a mobile node (MN).

The invention discloses an SRAM (Static Random Access Memory) unit. A first transmission transistor comprises a first source and a first gate; a first pull-down transistor comprises a second source; a second transmission transistor comprises a third source and a second gate; a second pull-down transistor comprises a fourth source electrode; a first pull-up transistor comprises a fifth source; a second pull-up transistor comprises a sixth source; in first and second interconnection line layers, one interconnection line layer comprises a word line and a power supply connection line, the other interconnection line layer comprises first and second bit lines and a grounding line, or one interconnection line layer comprises the word line and the grounding line, and the other interconnection line layer comprises the first and second bit lines and the power supply connection line; the word line is electrically connected with the first and second gates; the first bit line is electrically connected with the first source; the second bit line is electrically connected with the third source; the power supply connection line is electrically connected with the fifth and sixth sources; and the grounding line is electrically connected with the second and fourth sources. According to the scheme, the number of peripheral control circuits arranged on the first interconnection line layer is the same as the number of peripheral control circuits arranged on the second interconnection line layer; and supported lead tasks are basically balanced.

The invention discloses a network remote control system comprising a remote control base terminal and a control terminal, wherein the control terminal controls the remote control base terminal throughwireless transmission. The invention further provides an implementation method of the network remote control system for quickly and flexibly performing remote network control through the remote control system. According to the network remote control system disclosed by the invention, a user can control a mobile phone and other smart devices to move ( perform displacement or action) through a network by additionally mounting a base for the mobile phone and other smart devices. By additionally mounting the device for the mobile phone and other smart devices, the mobile phone and other smart devices can have brand new functions such as remote visit, remote display and remote commentary. Compared with the remote control devices currently on the market, the device disclosed by the invention has the advantages of low cost, high adaptability, convenient application, diverse functions or the like. Furthermore, by means of the remote visit/display/commentary functions, the manpower and the travel expenses of personnel can be greatly reduced, and the efficiency is higher.

The invention provides an intelligent power grid consistency privacy protection method and system based on state decomposition, and belongs to the field of information transmission and privacy protection. The method mainly comprises the processes of user-side electric meter data preprocessing and data distribution. Firstly, measured intelligent electric meter data are decomposed, one part is used for conducting data transmission with adjacent users, the other part is used for conducting internal calculation, and internal and external weights needed when information is transmitted are generated; in the data distribution process, an improved push-sum algorithm is adopted, a user carries out aggregation operation on data sent by adjacent users, information data of the user is weighted and sent to neighbors, and a final consistent value is achieved. According to the method, on the basis of ensuring that each user obtains an average consistency result, the personal privacy of each user can be protected.