cluster = new MiniDFSCluster.Builder(conf).numDataNodes(4).build();
String topDir = "/srcdat";
fs = cluster.getFileSystem();
cluster.waitActive();
util.createFiles(fs, topDir);
util.waitReplication(fs, topDir, (short)3);
String outStr = runFsck(conf, 0, true, "/");
assertTrue(outStr.contains(NamenodeFsck.HEALTHY_STATUS));
// Corrupt a block by deleting it
String[] fileNames = util.getFileNames(topDir);