presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/metadata/DatabaseShardManager.java/DatabaseShardManager/getNodeBytes
class DatabaseShardManager:    @Override
    public Map<String, Long> getNodeBytes()
    {
        return dao.getNodeSizes().stream()
                .collect(toMap(NodeSize::getNodeIdentifier, NodeSize::getSizeInBytes));
    }