protected Map<Integer, TPushTopicMetaResp> pushTopicMetaToDataNodes(ConfigNodeProcedureEnv env)
      throws IOException {
    final List<ByteBuffer> topicMetaBinaryList = new ArrayList<>();
    for (TopicMeta topicMeta : subscriptionInfo.get().getAllTopicMeta()) {
      topicMetaBinaryList.add(topicMeta.serialize());
    }

    return env.pushAllTopicMetaToDataNodes(topicMetaBinaryList);
  }
Pushing all the topicMeta's to all the dataNodes.

@param env ConfigNodeProcedureEnv
@return The responseMap after pushing topic meta
@throws IOException Exception when Serializing to byte buffer
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/procedure/impl/subscription/AbstractOperateSubscriptionProcedure.java