@Override
  public void updateCacheStatusAfterFlushFailure(ICachedMNode subtreeRoot) {
    nodeBuffer.addBackToBufferAfterFlushFailure(subtreeRoot);
  }
Collect updated storage group node.

@return null if not exist
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/mtree/impl/pbtree/memory/MemoryManager.java