（1）在pyspark连接，mongodb时连接代码如下：版本，spark2.3.0，scala2.11.8

# 创建会话
spark = SparkSession \
    .builder \
    .appName("pyspark-mongodb data source example") \
    .config("spark.mongodb.input.uri",
            "mongodb://192.168.5.247:27017/test.company_info") \
    .config("spark.mongodb.output.uri",
            "mongodb://192.168.5.247:27017/test.company_info") \
    .master('local[*]') \
    .getOrCreate()

# df = spark.read.format("com.mongodb.spark.sql").option("spark.mongodb.input.uri",
                                                            
#                              "mongodb://192.168.5.247:27017/test.company_info").load()

df = spark.read.format("com.mongodb.spark.sql").load()

（2）在连接时，报错:如下：

Caused by: java.lang.NoSuchMethodError: org.apache.spark.sql.catalyst.analysis.TypeCoercion$.findTightestCommonTypeOfTwo()Lscala/Function2;
        at com.mongodb.spark.sql.MongoInferSchema$.com$mongodb$spark$sql$MongoInferSchema$$compatibleType(MongoInferSchema.scala:135)
        at com.mongodb.spark.sql.MongoInferSchema$$anonfun$3.apply(MongoInferSchema.scala:78)
        at com.mongodb.spark.sql.MongoInferSchema$$anonfun$3.apply(MongoInferSchema.scala:78)
        at scala.collection.TraversableOnce$$anonfun$foldLeft$1.apply(TraversableOnce.scala:157)
        at scala.collection.TraversableOnce$$anonfun$foldLeft$1.apply(TraversableOnce.scala:157)
        at scala.collection.Iterator$class.foreach(Iterator.scala:893)
        at scala.collection.AbstractIterator.foreach(Iterator.scala:1336)
        at scala.collection.TraversableOnce$class.foldLeft(TraversableOnce.scala:157)
        at scala.collection.AbstractIterator.foldLeft(Iterator.scala:1336)
        at scala.collection.TraversableOnce$class.aggregate(TraversableOnce.scala:214)
        at scala.collection.AbstractIterator.aggregate(Iterator.scala:1336)
        at org.apache.spark.rdd.RDD$$anonfun$treeAggregate$1$$anonfun$23.apply(RDD.scala:1139)
        at org.apache.spark.rdd.RDD$$anonfun$treeAggregate$1$$anonfun$23.apply(RDD.scala:1139)
        at org.apache.spark.rdd.RDD$$anonfun$treeAggregate$1$$anonfun$24.apply(RDD.scala:1140)
        at org.apache.spark.rdd.RDD$$anonfun$treeAggregate$1$$anonfun$24.apply(RDD.scala:1140)
        at org.apache.spark.rdd.RDD$$anonfun$mapPartitions$1$$anonfun$apply$23.apply(RDD.scala:800)
        at org.apache.spark.rdd.RDD$$anonfun$mapPartitions$1$$anonfun$apply$23.apply(RDD.scala:800)
        at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
        at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:324)
        at org.apache.spark.rdd.RDD.iterator(RDD.scala:288)
        at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
        at org.apache.spark.scheduler.Task.run(Task.scala:109)
        at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:345)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        ... 1 more

（3）问题分析：

出现Caused by: java.lang.NoSuchMethodError这样的错误，一般都是jar包的版本冲突造成。

1. jar包的版本不对
2. 有两个版本的jar包，jar包版本冲突

（4）问题解决

1. 下载对应的包https://download.csdn.net/download/qq_21735341/10657593?（mongo-java-driver-3.8.0.jar，mongo-spark-connector_2.11-2.3.0.jar）
2. 在spark的jar包下替换掉之前的对应版本，注意：一定要将之前的版本删掉，一定要删掉，不然jar包版本冲突，会报一样的错误