TestDFSIO 之 热点分析

      while (actualSize < totalSize) {
        int curSize = in.read(buffer, 0, bufferSize);
        if(curSize < 0) break;
        actualSize += curSize;
        reporter.setStatus("reading " + name + "@" + 
                           actualSize + "/" + totalSize 
                           + " ::host = " + hostName);
      }

这里的代码存在 8% 的性能热点