@Override
    public String toString() {
      return "allocation size " + allocSize + ": " + successes + " allocations, " + ooms + " OOMs";
    }
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