How to use

calculateShouldScan

method

in

org.apache.hadoop.hdfs.server.datanode.VolumeScanner

expireOldScannedBytesRecords(monotonicMs);
if (!calculateShouldScan(volume.getStorageID(), conf.targetBytesPerSec,
  scannedBytesSum, startMinute, curMinute)) {

@Test(timeout=120000)
public void testCalculateNeededBytesPerSec() throws Exception {
 // If we didn't check anything the last hour, we should scan now.
 Assert.assertTrue(
   VolumeScanner.calculateShouldScan("test", 100, 0, 0, 60));
 // If, on average, we checked 101 bytes/s checked during the last hour,
 // stop checking now.
 Assert.assertFalse(VolumeScanner.
   calculateShouldScan("test", 100, 101 * 3600, 1000, 5000));
 // Target is 1 byte / s, but we didn't scan anything in the last minute.
 // Should scan now.
 Assert.assertTrue(VolumeScanner.
   calculateShouldScan("test", 1, 3540, 0, 60));
 // Target is 1000000 byte / s, but we didn't scan anything in the last
 // minute.  Should scan now.
 Assert.assertTrue(VolumeScanner.
   calculateShouldScan("test", 100000L, 354000000L, 0, 60));
 Assert.assertFalse(VolumeScanner.
   calculateShouldScan("test", 100000L, 365000000L, 0, 60));
}

expireOldScannedBytesRecords(monotonicMs);
if (!calculateShouldScan(volume.getStorageID(), conf.targetBytesPerSec,
  scannedBytesSum, startMinute, curMinute)) {

expireOldScannedBytesRecords(monotonicMs);
if (!calculateShouldScan(volume.getStorageID(), conf.targetBytesPerSec,
  scannedBytesSum, startMinute, curMinute)) {