Cases to test in this sub-task: 

• The hedged read fails first with an ignorable error, and the authoritative read fails with an ignorable error. The counters show: succeeded: 2 and canceled: 0. The ignorable error is seen as the response.
• The hedged read fails first with an ignorable error, and the authoritative read fails with a fatal error. The counters show: succeeded: 2 and canceled: 0. The fatal error is shown as the response.
• The hedged read fails first with an ignorable error, and the authoritative read succeeds. The counters show: success: 1 and failed: 1 and canceled: 0. The success response is shown as the response.
• The hedged read fails with a fatal error, and the authoritative request is canceled. The counters show success: 1 and canceled: 1. The failure is shown as the response.