A method, system, and computer program product for maintaining data centers obtain input data; communicate an update request associated with the input data to a node of a plurality of nodes; receive an indication that the update request failed; communicate a result request for result data associated with processing of the input data to the node of the plurality of nodes until the result data associated with processing of the input data is received; and in response to receiving the result data associated with processing of the input data from the node, process the result data.

Techniques are described herein that are capable of performing metadata extraction based on resource attributes and user-defined policy and topology. A hierarchical resource-grouping construct, which is selected from hierarchical resource-grouping constructs in a user-defined hierarchical resource-grouping topology of a cloud computing service account, is registered by enumerating at least a subset of the constructs. The subset includes the selected construct and each other construct encompassed by the selected construct. Metadata is selectively extracted from the constructs that are included in the subset to provide extracted metadata based at least in part on one or more user-defined policies, which are assigned among the constructs that are included in the subset, indicating whether the metadata is to be extracted as a result of resources associated with the constructs included in the subset having specified attributes. A searchable catalog is generated that includes the extracted metadata.

A method, system, and computer program product for maintaining data centers obtain input data; communicate an update request associated with the input data to a node of a plurality of nodes; receive an indication that the update request failed; communicate a result request for result data associated with processing of the input data to the node of the plurality of nodes until the result data associated with processing of the input data is received; and in response to receiving the result data associated with processing of the input data from the node, process the result data.

Methods, systems, and apparatus, including computer-readable media, for a hierarchical multi-tenant data access platforms. In some implementations, the a server system stores data collected through a multi-tenant data access platform configured to collect data for each of multiple tenant organizations and to selectively make the collected data available according to policies associated with the respective tenant organizations. The server system receives a request associated with a user, and the server system generates and provides a response according to the organization hierarchy data and policy data for the unit of the organization that has data that would be used in generating the response to the request.

Reconciliation and subscription-model permissions of data stored across independent ledger instances of a database. A system includes a resource manager coupled to a plurality of client accounts. The system includes an execution platform and a shared permissioned ledger comprising independent processing and storage nodes for executing data operations for the plurality of client accounts. The resource manager defines a settlement group comprising one or more client accounts and authenticates an observer node associated with the settlement group. The resource manager assigns ingested data an encryption level on a key hierarchy based on content of the ingested data.

A control device may be configured to form a network at a unique coordinated startup time. The control device may identify a role assigned to the control device in a previously-formed network that the control device was attached to. The control device may determine a unique coordinated startup time for the control device based on the role assigned to the control device in the previously-formed network. The control device may initiate a network formation procedure at the unique coordinated startup time for the device. For example, the network formation procedure may cause the control device to attach to another control device in the network. The network formation procedure is configured to enable the control device to assume the role assigned to the control device in the previously-formed network in the new network.

Reconciliation and subscription-model permissions of data stored across independent ledger instances of a database. A system includes a resource manager coupled to a plurality of client accounts. The system includes an execution platform and a shared permissioned ledger comprising independent processing and storage nodes for executing data operations for the plurality of client accounts. The resource manager defines a settlement group comprising one or more client accounts and authenticates an observer node associated with the settlement group. The resource manager assigns ingested data an encryption level on a key hierarchy based on content of the ingested data.

A set of computers can be grouped into a first group and second group of computers to receive a file object. The first group of computers are commanded to perform a peer-to-peer download of the file object from a source. The second group of computers are commanded to perform a peer-to-peer download of the file object from a computer in the first group of computers.

Methods, systems, and apparatus for optimizing communication in a blockchain network. An example method includes establishing, by a first relay node in the blockchain network, a connection with a first blockchain node in the blockchain network in response to a connection request of the first blockchain node; receiving, by the first relay node, a registration request transmitted by the first blockchain node; generating, by the first relay node, a registration event based on the registration request; updating, by the first relay node, a local routing table based on the registration event; and forwarding, by the first relay node, a message of the first blockchain node to another relay node or another blockchain node in the blockchain network that is connected to the first relay node based on the local routing table.

Some embodiments of the invention provide a method for processing requests for performing operations on resources in a software defined datacenter (SDDC). The resources are software-defined (SD) resources in some embodiments. The method initially receives a request to perform an operation with respect to a first resource in the SDDC. The method identifies a policy that matches (i.e., is applicable to) the received request for the first resource by comparing a set of attributes of the request with sets of attributes of a set of policies that place constraints on operations specified for resources. In some embodiments, several sets of attributes for several policies can be expressed for resources at different hierarchal resource levels of the SDDC. The method rejects the received request when the identified policy specifies that the requested operation violates a constraint on operations specified for the first resource.