[HDFS-13513] BenchmarkThroughput.readFile hangs with misconfigured BUFFER_SIZE

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Fix Version/s: 2.5.0
• Component/s: test
• Assignee: Unassigned
• Reporter: John Doe
• Created: 27/Apr/18 19:46
• Updated: 03/Sep/19 04:28

Description

When the BUFFER_SIZE is configured to be 0, the while loop in BenchmarkThroughput.readFile function hangs endlessly.
This is because when the data.size (i.e., BUFFER_SIZE) is 0, the val will always be 0 by invoking val=in.read(data).
Here is the code snippet.

  BUFFER_SIZE = conf.getInt("dfsthroughput.buffer.size", 4 * 1024);//when dfsthroughput.buffer.size is configued to be 0

  private void readFile(FileSystem fs, Path f, String name, Configuration conf ) throws IOException {
    System.out.print("Reading " + name);
    resetMeasurements();
    InputStream in = fs.open(f);
    byte[] data = new byte[BUFFER_SIZE];
    long val = 0;
    while (val >= 0) {
      val = in.read(data);
    }
    in.close();
    printMeasurements();
  }

The similar case is HDFS-13514

Issue Links

• links to: GitHub Pull Request #375
• links to: GitHub Pull Request #375