private static LlapAllocatorBuffer[] allocate(
      BuddyAllocator a, int count, int size, int baseValue) {
    return allocate(a, count, size, baseValue, true);
  }
This relies on allocations basically being sequential, no internal reordering. Rather,
the specific paths it takes do; all the scenarios should work regardless of allocation.
llap-server/src/test/org/apache/hadoop/hive/llap/cache/TestBuddyAllocatorForceEvict.java