Abstract:
A processing device translates a set of federated queries submitted to a federated data source server into a set of native data source queries for the particular type of data source using a federated data source connector for a particular type of data source, inputs the set of native data source queries for the particular type of data source into a component corresponding to the particular type of data source, marks the component in view of the set of native data source queries, and generates output indicating whether one or more of the set of native data source queries is not acceptable as input for the component. The marked component and the output indicate whether the federated data source connector for the particular type of data source includes an error.
Abstract:
Methods, systems, and computer program products for implementing a stability measurement are provided. A computer-implemented method for measuring stability may include creating a destabilized data source for a data source, wherein errors are injected into the destabilized data source; sending test queries to the destabilized data source and the data source; and comparing results of the test queries in order to calculate a stability measurement.
Abstract:
An example method of submitting a federated query to one or more data sources belonging to a federation includes splitting a zone into a plurality of zone subsets. The zone includes a plurality of data sources belonging to a federation. The plurality of zone subsets has disjoint sets of data sources belonging to the federation. The method also includes receiving a federated query from a client. The federated query includes a plurality of source queries. Each source query of the plurality of source queries is specific to an autonomous data source belonging to the federation. The method further includes determining the client's assigned zone subset of the plurality of zone subsets. The method also includes submitting the federated query to the client's assigned zone subset. The plurality of source queries is submitted to one or more data sources in the zone subset to which the client is assigned.
Abstract:
Systems and methods are provided for data federation query suggestion. An example system includes a query constraint database including at least one query constraint and a query constraint resolving module that receives from a user a query to search a federated database using a federated database search engine and determines if the query satisfies at least one query constraints. The system further includes a query suggestion module that determines a query suggestion if the query does not satisfy at least one query constraints.
Abstract:
A system and method of managing immutable objects includes monitoring new object construction, detecting construction of an object, determining a key for the object, looking the key up in a persistent storage system, when the key is found in the persistent storage system, loading the object from the persistent storage system, and when the key is not found in the persistent storage system constructing the object, determining whether the object is immutable, and storing the object in the persistent storage system when the object is immutable. In some examples, determining whether the object is immutable includes examining each primitive type data member of the object, examining each reference type constructor parameter of the object to determine whether the reference type constructor parameter is defensively copied, examining all function calls used by the object to determine whether the function calls preserve immutability, and recursively examining each reference type data member of the object.
Abstract:
A method includes consulting a database that includes a first entry indicating amounts of time that a first service provider machine takes to perform individual actions of the plurality of actions and a second entry indicating amounts of time that a second service provider machine takes to perform individual actions of the plurality of actions; generating a first estimate for the amount of time the first service provider machine is expected to take in processing the requested service, wherein generating the first estimate includes summing times associated with the plurality of actions from the first entry; and generating a second estimate for the amount of time the second service provider machine is expected to take in processing the requested service, wherein generating the second estimate includes summing times associated with the plurality of actions from the second entry.