Abstract: Exposing existing database server attributes that are used for load balancing, accounting, log filtering, problem determination, and end user identification as tenant identifiers. An example of such attribute is the values in existing client information fields that are available to applications for passing additional information to the database server via connections. These values are then used by the database server for enhanced operational functions of load balancing, accounting, log filtering, problem determination, and end user identification.

Abstract: A software-defined networking (SDN) controller communicatively coupled with a cloud orchestrator enables live migration of a virtual machine from a first network device to a second network device. The SDN controller receives from the cloud orchestrator an indication that migration of the virtual machine is to be initiated. In response to receiving the indication, a third network device is caused to forward flows towards the first network device by passing through the second network device. The SDN controller transmits to the cloud orchestrator an indication that the migration of the virtual machine can be performed, causing the cloud orchestrator to complete the migration of the virtual machine to the second network device. In response to the migration of the virtual machine, the second network device processes the flows locally instead of forwarding them to the first network device.

Abstract: Systems and methods of obtaining and recording fundus images by minimally trained persons, which includes a camera for obtaining images of a fundus of a subject's eye, in combination with mathematical methods to assign real time image quality classification to the images obtained based upon a set of criteria. The classified images will be further processed if the classified images are of sufficient image quality for clinical interpretation by machine-coded and/or human-based methods. Such systems and methods can thus automatically determine whether the quality of a retinal image is sufficient for computer-based eye disease screening. The system integrates global histogram features, textural features, and vessel density, as well as a local non-reference perceptual sharpness metric. A partial least square (PLS) classifier is trained to distinguish low quality images from normal quality images.

Abstract: Disclosed aspects relate to using a database driver to manage application resiliency with respect to a shared pool of configurable computing resources. A transaction request having a set of command data is received. The set of command data for the transaction request is captured in a memory device coupled with the database driver. The transaction request is connected with a first asset of the shared pool of configurable computing resources. An error event is detected related to the first asset. It is ascertained that the error event indicates a configuration for an automatic client reroute (ACR) operation. Using the ACR operation, the transaction request is connected with a second asset of the shared pool of configurable computing resources. The set of command data for the transaction request is transmitted from the memory device coupled with the database driver to the second asset.

Abstract: A method is performed by a network device acting as a controller in a software defined networking (SDN) network. The method detects control path loops in the SDN network. The method includes receiving a Packet-In message from a switch, where the Packet-In message includes a packet. The method further includes determining a packet identifier associated with the packet, determining a key based on the packet identifier associated with the packet, determining whether an entry associated with the key exists in a loop detection cache, updating a counter value associated with the entry in response to determining that the entry associated with the key exists in the loop detection cache, and determining that the packet is in a control path loop in response to determining that the counter value associated with the entry reaches a threshold value.

Abstract: Disclosed aspects relate to using a database driver to manage application resiliency with respect to a shared pool of configurable computing resources. A transaction request having a set of command data may be received. An updated set of global property data for the database driver may be detected. The updated set of global property data for the database driver may be captured in a memory device coupled with the database driver. An operational member asset of the shared pool of configurable computing resources may be determined to process the transaction request. The transaction request may be connected with the operational member asset of the shared pool of configurable computing resources. The set of command data for the transaction request may be transmitted to the operational member of the shared pool of configurable computing resources.

Abstract: Disclosed aspects relate to using a database driver to manage application resiliency with respect to a shared pool of configurable computing resources. A transaction request having a set of command data is received. The set of command data for the transaction request is captured in a memory device coupled with the database driver. The transaction request is connected with a first asset of the shared pool of configurable computing resources. An error event is detected related to the first asset. It is ascertained that the error event indicates a configuration for an automatic client reroute (ACR) operation. Using the ACR operation, the transaction request is connected with a second asset of the shared pool of configurable computing resources. The set of command data for the transaction request is transmitted from the memory device coupled with the database driver to the second asset.

Abstract: A standby database cluster takes on the role of the primary database cluster if the primary database cluster becomes unavailable using the following steps: (i) operating a database management system (DBMS) including an initial primary cluster and a plurality of standby clusters; (ii) communicating to a set of client driver(s) connecting a first application to the initial primary cluster an identity of the plurality of standby clusters; (iii) on condition that the initial primary cluster becomes unavailable, assigning a selected standby cluster of the plurality of standby clusters to be assigned as a new primary cluster in place of the initial primary cluster; and (iv) in response to assignment of the new primary cluster, seamlessly moving the first application from the initial primary cluster to the new primary cluster without any substantial human intervention.

Abstract: A method for path monitoring is disclosed. The method includes receiving, at the network device, a packet from a SDN controller to monitor a path for a service between the network device and another network device. The method includes sending the packet to at least a first and a second port, where a first instance of the packet is transmitted to the first port to the other network device to monitor the path, and a second instance is transmitted to the second port that loops back the second instance to the network device at a transmission interval so that the packet is sent to the first port repetitively at the transmission interval. The method also includes determining whether or not the packet is received from the other network device within a timeout interval and discarding the packet upon determination that the packet is received within the timeout interval.

Abstract: A method for generating a high-precision packet train includes configuring an initial packet generation flow of duration T in a network node and sending a packet to a loopback port to initiate the initial packet generation flow in the network node, where the loopback port loops packets back to the network node or recirculates packets within the network node, and where the loopback port is configured for traffic shaping that establishes a pre-determined inter-packet gap for packets output by the loopback port. The method further includes configuring a main packet generation flow having a duration t1 that commences on expiration of the duration T. Looped back packets in the network node are sent to the loopback port for the entirety of durations T and t1, while one copy of each looped back packet in the network node is sent to a network port during the duration t1.

Abstract: Methods for delay measurement in a software-defined networking (SDN) system are disclosed. In one embodiment, one packet each is received from a first and a second network device. The time stamps of these packets are recorded in a set of ingress time stamps and a set of egress time stamps respectively if the first and second network devices are the ingress and egress network devices of a traffic flow and if both packets include indications for delay measurement. Then the method continues with a delay measure for the traffic flow based on at least the sets of the ingress time stamps and egress time stamps associated with the flow identifier of the traffic flow, and a measurement noise the electronic device obtained from sending measurement packets to the first and second network devices.

Abstract: A standby database cluster takes on the role of the primary database cluster if the primary database cluster becomes unavailable using the following steps: (i) operating a database management system (DBMS) including an initial primary cluster and a plurality of standby clusters; (ii) communicating to a set of client driver(s) connecting a first application to the initial primary cluster an identity of the plurality of standby clusters; (iii) on condition that the initial primary cluster becomes unavailable, assigning a selected standby cluster of the plurality of standby clusters to be assigned as a new primary cluster in place of the initial primary cluster; and (iv) in response to assignment of the new primary cluster, seamlessly moving the first application from the initial primary cluster to the new primary cluster without any substantial human intervention.

Abstract: A method in a computing device for locality sensitive load balancing between servers includes receiving a packet and querying a plurality of Bloom filters, using keys based upon a plurality of header field values of the packet, to generate a plurality of candidate servers. A subset of the candidate servers were generated due to false positive matches occurring from some of the plurality of Bloom filters. One server of the plurality of servers is identified as the destination for the packet based upon identifying the subset of candidate servers within an entry of a false positive table. Each false positive table entry identifies, for a flow of packets, servers that are falsely included in sets of candidate servers generated by the plurality of Bloom filters for packets of that flow. The packet is transmitted to the first server.

Abstract: Methods for delay measurement in a software-defined networking (SDN) system are disclosed. In one embodiment, one packet each is received from a first and a second network device. The time stamps of these packets are recorded in a set of ingress time stamps and a set of egress time stamps respectively if the first and second network devices are the ingress and egress network devices of a traffic flow and if both packets include indications for delay measurement. Then the method continues with a delay measure for the traffic flow based on at least the sets of the ingress time stamps and egress time stamps associated with the flow identifier of the traffic flow, and a measurement noise the electronic device obtained from sending measurement packets to the first and second network devices.

Abstract: In one embodiment, a packet from a SDN controller is received at a network device. The packet is processed according to a flow table, which contains at least two entries that each matches the packet. The entries contain instructions to forward the packet according to group tables, and the entries are to expire after different time durations. The packet is to be forwarded according to a first group table and gets duplicated into two: one is transmitted to a first packet queue that transmits packets in a fixed interval to a loopback port that loops back the packets, while the other is forwarded to a first packet buffer that randomly drops packets at a probability prior to transmitting the remaining packets to generate a traffic pattern. The packet is received from the loopback port, and then forwarded according to a second group table to generate another traffic pattern.

Abstract: A method and system are implemented by a controller in a software defined networking (SDN) network. The SDN network includes a set of nodes. The controller is in communication with a server providing information about environmental events affecting the SDN network. The method includes receiving information about an environmental event affecting the SDN network, identifying a subset of the nodes in the SDN network affected by the environmental event based on location information for the subset of nodes, determining a degree of impact caused by the environmental event for each node in the subset of nodes, and configuring the SDN network to diminish an impact of the environmental event on the SDN network performance.

Abstract: A method for path monitoring is disclosed. The method includes receiving, at the network device, a packet from a SDN controller to monitor a path for a service between the network device and another network device. The method includes sending the packet to at least a first and a second port, where a first instance of the packet is transmitted to the first port to the other network device to monitor the path, and a second instance is transmitted to the second port that loops back the second instance to the network device at a transmission interval so that the packet is sent to the first port repetitively at the transmission interval. The method also includes determining whether or not the packet is received from the other network device within a timeout interval and discarding the packet upon determination that the packet is received within the timeout interval.

Abstract: In one embodiment, a packet from a SDN controller is received at a network device. The packet is processed according to a flow table, which contains at least two entries that each matches the packet. The entries contain instructions to forward the packet according to group tables, and the entries are to expire after different time durations. The packet is to be forwarded according to a first group table and gets duplicated into two: one is transmitted to a first packet queue that transmits packets in a fixed interval to a loopback port that loops back the packets, while the other is forwarded to a first packet buffer that randomly drops packets at a probability prior to transmitting the remaining packets to generate a traffic pattern. The packet is received from the loopback port, and then forwarded according to a second group table to generate another traffic pattern.

Abstract: Systems and methods of obtaining and recording fundus images by minimally trained persons, which includes a camera for obtaining images of a fundus of a subject's eye, in combination with mathematical methods to assign real time image quality classification to the images obtained based upon a set of criteria. The classified images will be further processed if the classified images are of sufficient image quality for clinical interpretation by machine-coded and/or human-based methods. Such systems and methods can thus automatically determine whether the quality of a retinal image is sufficient for computer-based eye disease screening. The system integrates global histogram features, textural features, and vessel density, as well as a local non-reference perceptual sharpness metric. A partial least square (PLS) classifier is trained to distinguish low quality images from normal quality images.

Abstract: Exposing existing database server attributes that are used for load balancing, accounting, log filtering, problem determination, and end user identification as tenant identifiers. An example of such attribute is the values in existing client information fields that are available to applications for passing additional information to the database server via connections. These values are then used by the database server for enhanced operational functions of load balancing, accounting, log filtering, problem determination, and end user identification.