Abstract: The invention provides a method and system for a blast-induced vibration monitoring of a tunnel in high asymmetric in-situ stresses. According to the method, triaxial vibration sensors are respectively fixed in areas having different radial depths inside surrounding rocks of a stress concentration area behind a tunnel face of the tunnel in high asymmetric in-situ stresses, and each triaxial vibration sensor monitors blast vibration velocity and acceleration at a position thereof. The system comprises a plurality of triaxial vibration sensors which are fixed in areas having different radial depths inside surrounding rocks of a stress concentration area behind a tunnel face of the tunnel in high asymmetric in-situ stresses, and each triaxial vibration sensor is used for monitoring blast vibration velocity and acceleration at a position thereof. The method and system can improve the safety and the efficiency of tunnel excavation construction.

Abstract: The invention provides a method and system for a blast-induced vibration monitoring of a tunnel in high asymmetric in-situ stresses. According to the method, triaxial vibration sensors are respectively fixed in areas having different radial depths inside surrounding rocks of a stress concentration area behind a tunnel face of the tunnel in high asymmetric in-situ stresses, and each triaxial vibration sensor monitors blast vibration velocity and acceleration at a position thereof. The system comprises a plurality of triaxial vibration sensors which are fixed in areas having different radial depths inside surrounding rocks of a stress concentration area behind a tunnel face of the tunnel in high asymmetric in-situ stresses, and each triaxial vibration sensor is used for monitoring blast vibration velocity and acceleration at a position thereof. The method and system can improve the safety and the efficiency of tunnel excavation construction.

Abstract: The present application discloses a data reconstruction method based on erasure coding, an apparatus, a device and a storage medium. The method comprise the following steps: acquiring data offset information of incremental data in a data object; acquiring corresponding data segments from a plurality of source OSDs according to the data offset information; wherein, the source OSDs are target OSDs storing incremental data among respective OSDs storing data objects based on erasure coding, and a quantity of the source OSDs is the same as a quantity of data disks corresponding to the erasure coding; integrating the data segments into an erasure incremental segment, and writing the erasure incremental segment into a to-be-reconstructed OSD, which has no incremental data stored therein, among the respective OSDs. The present method reduces the data volume of data reconstruction, and further ensures the overall efficiency of data reconstruction.

Abstract: Systems and methods are described for provisioning a desktop interface at a cloud service provider. An application service is introduced that selects a cloud service provider for provisioning a virtual machine (“VM”) that hosts the desktop interface. In an example, a user can request access to a virtual desktop from a client device. The application service can retrieve network latency data from multiple cloud service providers and select the provider with the lowest network latency for the client device. In some examples, the application service can select the cloud service provider on additional factors, such as the cost of provisioning the VM at each cloud service provider. The application service can provision the VM at the selected cloud service provider and facilitate access to the virtual desktop for the client device.

Abstract: The present disclosure describes techniques of providing data consistency for hybrid transactional and analytical processing. Logical logs and log serial numbers (LSNs) associated with the logical logs may be generated based on data captured by a first processing engine. The logical logs and the LSNs may be propagated to a storage subsystem configured to be in communication with the first processing engine and a second processing engine. The LSNs and information indicative of LSN schema versions may be stored and distributed by a metadata service. The first processing engine, the second processing engine, the storage subsystem and the metadata service are modularized, and support a LSN mechanism for maintaining data consistency.

Abstract: A capacity expansion method for a storage cluster has the following steps: receiving an expansion instruction and determining a new expansion node corresponding to the instruction; traversing all placement groups to determine reference counts of OSDs corresponding to each of the groups, wherein the reference count of each OSD is the same as the number of groups; setting the OSD with the largest reference count associated with each group as an OSD to be determined; calling a data distribution interface to select an optimal OSD from the new node to replace the OSD to be determined. The OSD with the largest reference count associated with each group can only be replaced by an OSD in the new node, so that the data migration between the old nodes is eliminated, thereby improving expansion and reconstruction efficiency, reducing the resource utilization rate when the system is being expanded, and improving system performance.

Abstract: Provided a bolt-bearing circumferential device for reinforcing and correcting an angle iron of a transmission tower, comprising a reinforcing angle iron, a holding hoop, and a connector; the reinforcing angle iron is arranged at an inner side of two limbs of an angle iron to be reinforced, an axis direction of the reinforcing angle iron is parallel to the angle iron to be reinforced, and an outer wall of two limbs of the reinforcing angle iron are fitted with an inner wall of the angle iron to be reinforced; the holding hoop is arranged at an outer side of the reinforcing angle iron and the angle iron to be reinforced, and each part of the holding hoop are connected together through the high-strength bolts; a side wall of the holding hoop is provided with three groups of threaded holes, wherein an axis of a first group of the threaded holes and an axis of a second group of the threaded holes are perpendicular to each other, a first group of bolts pass through the first group of the threaded holes to apply a r

Abstract: A method and apparatus for processing cluster node failure, a computer device and a readable storage medium. The method includes: circularly acquiring state information of multiple nodes in a cluster, and on the basis of the state information, determining whether a corresponding node fails; in response to failure of the node, sending failure information to multiple OSDs under the node; in response to the multiple OSDs receiving the failure information, according to the failure information, selecting a Monitor to send down information, and setting states of the multiple OSDs to be down; and in response to the Monitor receiving the down information, updating an OSDMap on the basis of the down information, and sending the updated OSDMap to OSDs under other nodes.

Abstract: Provided a bolt-bearing circumferential device for reinforcing and correcting an angle iron of a transmission tower, comprising a reinforcing angle iron, a holding hoop, and a connector; the reinforcing angle iron is arranged at an inner side of two limbs of an angle iron to be reinforced, an axis direction of the reinforcing angle iron is parallel to the angle iron to be reinforced, and an outer wall of two limbs of the reinforcing angle iron are fitted with an inner wall of the angle iron to be reinforced; the holding hoop is arranged at an outer side of the reinforcing angle iron and the angle iron to be reinforced, and each part of the holding hoop are connected together through the high-strength bolts; a side wall of the holding hoop is provided with three groups of threaded holes, wherein an axis of a first group of the threaded holes and an axis of a second group of the threaded holes are perpendicular to each other, a first group of bolts pass through the first group of the threaded holes to apply a r

Abstract: Provided are a method and system for balancing and optimizing a primary placement group, and a device and a storage medium. The method includes: determining a theoretical average value; determining a weight corresponding to each object-based storage device based on an actual capacity occupied by the object-based storage device and the theoretical average value; determining the number of expected balanced primary placement groups based on the total number of current primary placement groups and the weight corresponding to the object-based storage device; obtaining a corresponding base value based on an address of each placement group and an address of the object-based storage device, and determining the placement group as a primary placement group in a case where the base value is less than a preset value; and repeating a previous operation until the number of the determined primary placement groups reaches the number of the expected balanced primary placement groups.

Abstract: A method and apparatus for processing cluster node failure, a computer device and a readable storage medium. The method includes: circularly acquiring state information of multiple nodes in a cluster, and on the basis of the state information, determining whether a corresponding node fails; in response to failure of the node, sending failure information to multiple OSDs under the node; in response to the multiple OSDs receiving the failure information, according to the failure information, selecting a Monitor to send down information, and setting states of the multiple OSDs to be down; and in response to the Monitor receiving the down information, updating an OSDMap on the basis of the down information, and sending the updated OSDMap to OSDs under other nodes.

Abstract: The method includes the following steps: acquiring originally distributed OSD lists of placement groups (PGs) in a cluster storage pool (S1); when disk replacement occurs in the cluster storage pool, acquiring newly distributed OSD lists of the placement groups (PGs) in the cluster storage pool (S2); calculating the difference terms between the originally distributed OSD lists and the newly distributed OSD lists of the placement groups (PGs), and generating a difference comparison table (S3); traversing the difference comparison table to sequentially delete a replacement hard disk, in the corresponding newly distributed OSD list, of the difference term of each placement group(PG), so as to obtain a placement group (PG) with additional OSD changes, and generating a difference correction table(S4); and applying the difference correction table to correct the placement group (PG) with the additional OSD changes to be originally distributed (S5).

Abstract: An abnormal index node (inode) dynamic repair method, system, and apparatus, and a readable memory medium. The method includes: obtaining an overall memory structure of an abnormal inode in a memory, and converting the overall memory structure into an editable file; determining an abnormal field in the editable file according to error reporting information; writing an expected value of a file system to a position of the abnormal field in the editable file to obtain a repaired editable file; and importing the repaired editable file back to the memory.

Abstract: The present disclosure describes techniques of providing data consistency for hybrid transactional and analytical processing. Logical logs and log serial numbers (LSNs) associated with the logical logs may be generated based on data captured by a first processing engine. The logical logs and the LSNs may be propagated to a storage subsystem configured to be in communication with the first processing engine and a second processing engine. The LSNs and information indicative of LSN schema versions may be stored and distributed by a metadata service. The first processing engine, the second processing engine, the storage subsystem and the metadata service are modularized, and support a LSN mechanism for maintaining data consistency.

Abstract: An abnormal index node (inode) dynamic repair method, system, and apparatus, and a readable memory medium. The method includes: obtaining an overall memory structure of an abnormal inode in a memory, and converting the overall memory structure into an editable file; determining an abnormal field in the editable file according to error reporting information; writing an expected value of a file system to a position of the abnormal field in the editable file to obtain a repaired editable file; and importing the repaired editable file back to the memory.

Abstract: A method, apparatus and device for deleting a distributed system file, and a storage medium, comprising: querying whether an incomplete file deletion operation exists under a sub-tree root corresponding to a certain MDS (S102); if there is an incomplete file deletion operation, continuing to delete data under the sub-tree root corresponding to the MDS, and determining whether the sub-tree root is a copy (S103); and if the sub-tree root is a copy, deleting the sub-tree root copy in a memory of the MDS (S104). By means of the steps, the number of copies of the sub-tree root in the distributed file system can be reduced, thereby reducing the number of interaction times of master copy locking between different MDSs, improving the file deletion efficiency, and improving user friendliness and differentiated competitiveness of a product.

Abstract: A MON service migration method, apparatus, and device, and a readable storage medium, for use in any node in a distributed storage system. The method comprises: acquiring historical data of a MON service in a current node; in the node, determining a target magnetic disk for migrating the MON service, and migrating the historical data to the target magnetic disk; creating mount information of the MON service in a configuration file of the distributed storage system; and restarting the MON service according to the configuration file, such that the MON service migrates to the target magnetic disk. The present method does not need to remove nodes in the distributed storage system, and therefore the MON service migration process will not affect front-end services, improving the service capabilities and reliability of the distributed storage system.

Abstract: A data recovery method, apparatus and device, and a readable storage medium are provided. The method comprises: receiving and analyzing a data recovery request, and obtaining a total cluster data recovery amount and a total local data recovery amount; determining a basic recovery speed by means of the total cluster data recovery amount and the total local data recovery amount; performing data recovery, and compiling statistics on a proportion of recovered small files within a specified number of recovery periods; and adjusting the basic recovery speed by means of the proportion of the small files, and performing data recovery according to the adjusted basic recovery speed. In the method, a basic recovery speed can be adjusted in accordance with the small file recovery proportion, such that the overall efficiency of data recovery can be improved, and the influence on a front-end service of a user can also be reduced.

Abstract: A method of establishing a secure communication channel from a first edge device that is in a first network zone across a secure overlay network to a second edge device that is in a second network zone, so that access to a computing device that is in the second network zone can be authenticated by an authentication service that is in the first network zone, includes the steps of establishing a first secure communication channel from the first edge device to the secure overlay network, receiving a request to join the secure overlay network along with administrator credential information and, responsive to the request, transmitting the administrator credential information to the authentication service for authentication through the first secure communication channel and the first edge device, and establishing a second secure communication channel from the second edge device to the secure overlay network if the authentication is received from the authentication service.

Abstract: A method of establishing a secure communication channel from a first edge device that is in a first network zone across a secure overlay network to a second edge device that is in a second network zone, so that access to a computing device that is in the second network zone can be authenticated by an authentication service that is in the first network zone, includes the steps of establishing a first secure communication channel from the first edge device to the secure overlay network, receiving a request to join the secure overlay network along with administrator credential information and, responsive to the request, transmitting the administrator credential information to the authentication service for authentication through the first secure communication channel and the first edge device, and establishing a second secure communication channel from the second edge device to the secure overlay network if the authentication is received from the authentication service.