// When reading again, it should start from a fresh failure count, since
// we're starting a new operation on the user level.
doAnswer(new FailNTimesAnswer(preSpyNN, numDataNode,
Math.min(maxBlockAcquires, numDataNode)))
.when(spyNN).openAndFetchMetaInfo(anyString(), anyLong(), anyLong());
is.openInfo();
// Seek to beginning forces a reopen of the BlockReader - otherwise it'll
// just keep reading on the existing stream and the fact that we've poisoned
// the block info won't do anything.
is.seek(0);
IOUtils.readFully(is, buf, 0, buf.length);