摘要:
A system, method and computer-readable medium for optimizing recovery logging is provided. A calling component stably logs a message from a called component only when sending a second message or sending a second message after a log force that writes the return message from the first message to the stable log. The called component stably logs its return message before the return message is sent.
摘要:
Persistent components are provided across both process and server failures, without the application programmer needing take actions for component recoverability. Application interactions with a stateful component are transparently intercepted and stably logged to persistent storage. A “virtual” component isolates an application from component failures, permitting the mapping of a component to an arbitrary “physical” component. Component failures are detected and masked from the application. A virtual component is re-mapped to a new physical component, and the operations required to recreate a component and reinstall state up to the point of the last logged interaction is replayed from the log automatically.
摘要:
Persistent components are provided across both process and server failures, without the application programmer needing take actions for component recoverability. Application interactions with a stateful component are transparently intercepted and stably logged to persistent storage. A “virtual” component isolates an application from component failures, permitting the mapping of a component to an arbitrary “physical” component. Component failures are detected and masked from the application. A virtual component is re-mapped to a new physical component, and the operations required to recreate a component and reinstall state up to the point of the last logged interaction is replayed from the log automatically.
摘要:
Persistent components are provided across both process and server failures, without the application programmer needing take actions for component recoverability. Application interactions with a stateful component are transparently intercepted and stably logged to persistent storage. A “virtual” component isolates an application from component failures, permitting the mapping of a component to an arbitrary “physical” component. Component failures are detected and masked from the application. A virtual component is re-mapped to a new physical component, and the operations required to recreate a component and reinstall state up to the point of the last logged interaction is replayed from the log automatically.
摘要:
The subject invention pertains to data store corruption recovery. More specifically, the invention concerns systems and methods for identifying corrupt data in a manner that prevents de-committing or removal of valid or consistent transactions from a database. This can be accomplished at least in part by logging the identities of data items that a transaction reads. Furthermore, the subject invention provides for employment of a multi-version (or transaction-time) database to reduce significantly reduce any down time or database unavailability caused by a corrupt transaction and associated corrupt data items. Accordingly, no backups need to be installed and only updates by the original corrupt transaction and transactions that read corrupt data need to be de-committed or removed.
摘要:
A single device that receives communications, resources, data, and/or other information intended for a user having multiple contact addresses is provided. The single device can receive various information intended for multiple telephone numbers, email aliases, screen names, aliases, other means of contact, or combinations thereof. The device can selectively forward the information to the user based on a current user role, user preferences, contact information, or based on other criteria. If information is to be forwarded to the user at substantially the same time as receipt, automatic means of notifying the user of the role for which the communication is intended are provided.
摘要:
A distributed event processing system that can organize (e.g., order) input streams regardless of actual time of receipt is provided. This order may simply be arrival order or given explicitly on a specific event attribute, such as a timestamp or sequence number. Traditional standing event queries, such as a temporal correlation of events across multiple streams, often block if an input stream is slow or may produce an incorrect answer if events fail to arrive within the fixed time interval. In response to this situation, the subject innovation employs punctuation and heartbeats in connection with a robust and scalable event processing system. The innovation discloses mechanisms by which heartbeats and timestamps can be regularly generated by low-level nodes (e.g., sources) and propagated through the network, to unblock standing event pattern queries and align events from multiple distributed streams.
摘要:
Aspects of the subject matter described herein relate to workflows. In aspects, an activity of a workflow may request data and provide a logical handle. In response, distributed workflow components use the logical handle to determine whether the requested data is available locally or remotely. If the data is available remotely, the components may obtain the data for the requesting entity. In the process of obtaining the data, the data may be serialized and deserialized. After the data is available locally, it is provided to the requesting entity.
摘要:
A streaming operator assignment system and method for determining a streaming operator assignment that minimizes overload in a data processing system. Embodiments of the streaming operator assignment system include an optimization goals definition module, which defines optimization goals in terms of fundamental quantities that system administrators and application writers want to control, such as minimizing the worst case latency over all periods of time, or minimizing how much the system is backlogged with work. Embodiments of the streaming operator assignment system also include an optimization goals solution module that optimizes and solves a selected optimization goal. A specialized optimization technique is used to find the best operator (or load) assignment using the optimization goals to measure of the value of the assignment. This technique minimizes an optimization goal by iterating over all possible operators assignments over all possible nodes to find the operator assignment that minimizes the desired optimization goal.
摘要:
A single device that receives communications intended for a user having multiple contact addresses associated with different user roles is provided. The single device can receive communications intended for multiple telephone numbers, email aliases, screen names, aliases, other means of contact, or combinations thereof. Since a user engaged in a particular role might not desire to be interrupted with communications intended for a different role, the communications for the other roles can be maintained until the user is actively engaged in the role for which the communication was intended. In situations where there is an important communication sent to a non-active role, selective convergence between roles is initiated and the important communication is presented to the user.