Abstract: In general, the subject matter described in this disclosure can be embodied in methods, systems, and program products. A computing system identifies first resources. The computing system identifies one or more search modes. The computing system provides first information for causing a first user interface to present first search results, and a search mode selector for each of the identified search modes. The computing system receives an indication that a user has selected a search mode. The computing system identifies second resources that are responsive to the search query and that are associated with the selected search mode. The computing system provides second information for causing a second user interface to present second search results that identify at least a portion of the second resources, each of the second search results being formatted for presentation according to a presentation template that is specific to the selected search mode.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for leasing tasks from multiple prioritized groups. One of the methods includes separating tasks into multiple groups where each task is associated with a respective group identification. The tasks are prioritized in each of the multiple groups where each task is associated with a respective priority identification. A request is received from a worker process for a number of tasks within a group, and a number of the tasks within the group are leased to the worker process for a first time period such that the leased tasks are unavailable to other worker processes during the first time period.

Abstract: Methods, systems, and computer program products feature determining a plurality of search result items responsive to a search query. A plurality of search modes are identified based on the query or the plurality of search result items or both. Each search mode is associated with a respective collection of records. The plurality of search result items are provided to a user with an indication of each search mode in the plurality of search modes. User input selecting a first search mode is received, where the first search mode is one of the plurality of search modes. One or more mode-specific search result items are determined based on the search query, where each mode-specific search result item is from the collection of records that is associated with the first search mode. The one or more mode-specific search result items are provided to the user.

Abstract: Methods, systems, and computer program products feature determining a plurality of search result items responsive to a search query. A plurality of search modes are identified based on the query or the plurality of search result items or both. Each search mode is associated with a respective collection of records. The plurality of search result items are provided to a user with an indication of each search mode in the plurality of search modes. User input selecting a first search mode is received, where the first search mode is one of the plurality of search modes. One or more mode-specific search result items are determined based on the search query, where each mode-specific search result item is from the collection of records that is associated with the first search mode. The one or more mode-specific search result items are provided to the user.

Abstract: Methods, systems, and computer program products feature determining a plurality of search result items responsive to a search query. A plurality of search modes are identified based on the query or the plurality of search result items or both. Each search mode is associated with a respective collection of records. The plurality of search result items are provided to a user with an indication of each search mode in the plurality of search modes. User input selecting a first search mode is received, where the first search mode is one of the plurality of search modes. One or more mode-specific search result items are determined based on the search query, where each mode-specific search result item is from the collection of records that is associated with the first search mode. The one or more mode-specific search result items are provided to the user.

Abstract: Methods, systems, and computer program products feature determining a plurality of search result items responsive to a search query. A plurality of search modes are identified based on the query or the plurality of search result items or both. Each search mode is associated with a respective collection of records. The plurality of search result items are provided to a user with an indication of each search mode in the plurality of search modes. User input selecting a first search mode is received, where the first search mode is one of the plurality of search modes. One or more mode-specific search result items are determined based on the search query, where each mode-specific search result item is from the collection of records that is associated with the first search mode. The one or more mode-specific search result items are provided to the user.