@Override
  public void deallocateProactivelyEvicted(MemoryBuffer buffer) {
    LlapAllocatorBuffer buf = (LlapAllocatorBuffer)buffer;
    assert buf.isInvalid();
    int arenaToRelease = buf.releaseInvalidated();
    if (arenaToRelease < 0) return; // The block is being moved; the move will release memory.
    long memUsage = buf.getMemoryUsage();
    arenas[arenaToRelease].deallocate(buf, false);
    memoryManager.releaseMemory(memUsage);
  }
Quite similar as deallocateEvicted, however since this request was not originated from a reserveMemory call,
MM state has to be maintained here.
@param buffer
llap-server/src/java/org/apache/hadoop/hive/llap/cache/BuddyAllocator.java