PROSAGA码农传奇-druid-与Druid，Kafka，Superset流式传输

我正在使用Kafka，Druid和SuperSet测试数据流。我现在在Druid中有一些数据（请参阅1. picutre）。之后，我可以通过选项“刷新Druid元数据”在Superset中生成Druid数据源（请参见2.pic）。问题是当我想查询数据时，出现以下错误消息：
<pre><code>URLError: <urlopen error [Errno -2] Name or service not known>

Traceback (most recent call last):
 File "/usr/lib/python2.7/site-packages/superset/viz.py", line 329, in get_df_payload
 df = self.get_df(query_obj)
 File "/usr/lib/python2.7/site-packages/superset/viz.py", line 142, in get_df
 self.results = self.datasource.query(query_obj)
 File "/usr/lib/python2.7/site-packages/superset/connectors/druid/models.py", line 1238, in query
 client=client, query_obj=query_obj, phase=2)
 File "/usr/lib/python2.7/site-packages/superset/connectors/druid/models.py", line 959, in get_query_str
 return self.run_query(client=client, phase=phase, **query_obj)
 File "/usr/lib/python2.7/site-packages/superset/connectors/druid/models.py", line 1126, in run_query
 client.timeseries(**qry)
 File "/usr/lib/python2.7/site-packages/pydruid/client.py", line 167, in timeseries
 return self._post(query)
 File "/usr/lib/python2.7/site-packages/pydruid/client.py", line 484, in _post
 res = urllib.request.urlopen(req)
 File "/usr/lib64/python2.7/urllib2.py", line 154, in urlopen
 return opener.open(url, data, timeout)
 File "/usr/lib64/python2.7/urllib2.py", line 431, in open
 response = self._open(req, data)
 File "/usr/lib64/python2.7/urllib2.py", line 449, in _open
 '_open', req)
 File "/usr/lib64/python2.7/urllib2.py", line 409, in _call_chain
 result = func(*args)
 File "/usr/lib64/python2.7/urllib2.py", line 1244, in http_open
 return self.do_open(httplib.HTTPConnection, req)
 File "/usr/lib64/python2.7/urllib2.py", line 1214, in do_open
 raise URLError(err)
URLError: <urlopen error [Errno -2] Name or service not known>
</code></pre>并请参阅3. pic知道会是什么问题吗？我通过NiFi喂食卡夫卡，然后将卡夫卡源钩在SAM中的德鲁伊目标身上。谢谢！