private void assertBufferLooksValid(
      int freeListIx, LlapAllocatorBuffer buf, int arenaIx, int headerIx) {
    if (buf.allocSize == allocSizeFromFreeList(freeListIx)) return;
    failWithLog("Race; allocation size " + buf.allocSize + ", not "
        + allocSizeFromFreeList(freeListIx) + " for free list "
        + freeListIx + " at " + arenaIx + ":" + headerIx);
  }
Unsets the headers (meaning this does not refer to a buffer).
llap-server/src/java/org/apache/hadoop/hive/llap/cache/BuddyAllocator.java