MiniDFSNNTopology topology = MiniDFSNNTopology.simpleHATopology();
cluster = new MiniDFSCluster.Builder(conf).nnTopology(topology)
.numDataNodes(0).build();
cluster.waitActive();
// Shutdown and clear the current filebased shared dir.
cluster.shutdownNameNodes();
File shareddir = new File(cluster.getSharedEditsDir(0, 1));
assertTrue("Initial Shared edits dir not fully deleted",
FileUtil.fullyDelete(shareddir));
// Check namenodes should not start without shared dir.