@Override
  public void remove(CacheEntry cacheEntry) {
    maps[getLoc(cacheEntry)].remove(cacheEntry);
  }
look for the first none volatile ancestor of this node and add it to nodeBuffer. Through this
the volatile subtree the given node belong to will be record in nodeBuffer.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/mtree/impl/pbtree/memory/buffer/NodeBuffer.java