private void unsetHeader(int headerIndex, CasLog.Src src) {
      headers[headerIndex] = 0;
      CasLog.logUnset(src, arenaIx, headerIndex, headerIndex);
    }
Unsets the header at an index (meaning this does not refer to a buffer).
llap-server/src/java/org/apache/hadoop/hive/llap/cache/BuddyAllocator.java