How to use

getVolumeStats

method

in

org.apache.hadoop.hdfs.server.datanode.BlockScanner

 @Override
 public Boolean get() {
  synchronized (info) {
   Statistics stats = ctx.blockScanner.getVolumeStats(
     ctx.volumes.get(0).getStorageID());
   if (stats.scansSinceRestart < 3) {
    LOG.info("Waiting for scansSinceRestart to reach 3 (it is {})",
      stats.scansSinceRestart);
    return false;
   }
   if (!stats.eof) {
    LOG.info("Waiting for eof.");
    return false;
   }
   return true;
  }
 }
}, 3, 30000);

 assertEquals(NUM_EXPECTED_BLOCKS, info.blocksScanned);
Statistics stats = ctx.blockScanner.getVolumeStats(
  ctx.volumes.get(0).getStorageID());
assertEquals(5 * NUM_EXPECTED_BLOCKS, stats.bytesScannedInPastHour);

Statistics stats = ctx.blockScanner.getVolumeStats(
  ctx.volumes.get(0).getStorageID());
assertEquals(TOTAL_FILES, stats.blocksScannedSinceRestart);