NamenodeProtocols nnRpc = namenode.getRpcServer();
DataNode dn0 = cluster.getDataNodes().get(0);
String bpid = cluster.getNamesystem().getBlockPoolId();
LinkedList<Long> bogusBlockIds = new LinkedList<Long> ();
bogusBlockIds.add(999999L);
nnRpc.cacheReport(dn0.getDNRegistrationForBP(bpid), bpid, bogusBlockIds);
Path rootDir = helper.getDefaultWorkingDirectory(dfs);
// Create the pool
final String pool = "friendlyPool";
nnRpc.addCachePool(new CachePoolInfo("friendlyPool"));