我正在尝试将mongodb与pyspark连接。当我试图像这样将数据从mongodb加载到pyspark时，它抛出了此异常。有人可以帮我吗？
>>>df = spark.read.format('com.stratio.datasource.mongodb')\
.options(host='localhost:7077',database='my_db', \ collection='my_coll').load()
....
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/phamgiabao/spark-2.3.1-bin-hadoop2.7/python/pyspark/sql/readwriter.py", line 172, in load
return self._df(self._jreader.load())
File "/home/phamgiabao/spark-2.3.1-bin-hadoop2.7/python/lib/py4j-0.10.7-src.zip/py4j/java_gateway.py", line 1257, in __call__
File "/home/phamgiabao/spark-2.3.1-bin-hadoop2.7/python/pyspark/sql/utils.py", line 63, in deco
return f(*a, **kw)
File "/home/phamgiabao/spark-2.3.1-bin-hadoop2.7/python/lib/py4j-0.10.7-src.zip/py4j/protocol.py", line 328, in get_return_value
py4j.protocol.Py4JJavaError: An error occurred while calling o140.load.
: com.mongodb.MongoTimeoutException: Timed out after 10000 ms while waiting to connect. Client view of cluster state is {type=Unknown, servers=[{address=localhost:7077, type=Unknown, state=Connecting}]
at com.mongodb.BaseCluster.getDescription(BaseCluster.java:128)
at com.mongodb.DBTCPConnector.getClusterDescription(DBTCPConnector.java:394)
at com.mongodb.DBTCPConnector.getType(DBTCPConnector.java:571)
at com.mongodb.DBTCPConnector.getReplicaSetStatus(DBTCPConnector.java:362)
at com.mongodb.Mongo.getReplicaSetStatus(Mongo.java:446)
at com.mongodb.DB.getCommandReadPreference(DB.java:82)
at com.mongodb.DB.command(DB.java:317)
at com.mongodb.DB.command(DB.java:299)
at com.mongodb.DBCollection.getStats(DBCollection.java:1808)
....