import org.apache.hadoop.hbase.io.hfile.bucket.BucketAllocator.IndexStatistics; //导入依赖的package包/类
@Test
public void testBucketAllocator() throws BucketAllocatorException {
  BucketAllocator mAllocator = cache.getAllocator();
  /*
   * Test the allocator first
   */
  int[] blockSizes = new int[2];
  blockSizes[0] = 4 * 1024;
  blockSizes[1] = 8 * 1024;
  boolean full = false;
  int i = 0;
  ArrayList<Long> allocations = new ArrayList<Long>();
  // Fill the allocated extents
  while (!full) {
    try {
      allocations.add(new Long(mAllocator.allocateBlock(blockSizes[i
          % blockSizes.length])));
      ++i;
    } catch (CacheFullException cfe) {
      full = true;
    }
  }

  for (i = 0; i < blockSizes.length; i++) {
    BucketSizeInfo bucketSizeInfo = mAllocator
        .roundUpToBucketSizeInfo(blockSizes[0]);
    IndexStatistics indexStatistics = bucketSizeInfo.statistics();
    assertTrue(indexStatistics.freeCount() == 0);
  }

  for (long offset : allocations) {
    assertTrue(mAllocator.sizeOfAllocation(offset) == mAllocator
        .freeBlock(offset));
  }
  assertTrue(mAllocator.getUsedSize() == 0);
}