long executeOp(int daemonId, int inputIdx, String ignore) throws IOException { assert daemonId < numThreads : "Wrong daemonId."; TinyDatanode dn = datanodes[daemonId]; long start = System.currentTimeMillis(); nameNode.blockReport(dn.dnRegistration, BlockListAsLongs.convertToArrayLongs(dn.blocks)); long end = System.currentTimeMillis(); return end - start; }