public void createRegionCache(int dataNodeId, TConsensusGroupId groupId) {
    regionCacheMap.put(dataNodeId, new RegionCache(dataNodeId, groupId));
  }
Create the cache of the specified Region.

@param dataNodeId the specified DataNode
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/manager/load/cache/region/RegionGroupCache.java