The Windows Azure Diagnostics configuration file specifies a schedule in which the various data buffers are persisted to the Windows Azure Storage Service. The on-demand transfer capability in Windows Azure Diagnostics allows a transfer to be requested outside this schedule. This is useful if a problem occurs with an instance and it becomes necessary to look at the captured logs before the next scheduled transfer.
An on-demand transfer is requested for a specific data buffer in a specific instance. This request is inserted into the diagnostics configuration for the instance stored in a blob in wad-control-container. This is an asynchronous operation whose completion is indicated by the insertion of a message in a specified notification queue. The on-demand transfer is configured using an OnDemandTransferOptions instance that specifies the DateTime range for the transfer, a LogLevelFilter that filters the data to be transferred, and the name of the notification...