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  1. Spark Connector
  2. SPARK-143

DBRef is only supported by 24 digit

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Details

    • Bug
    • Status: Closed
    • Major - P3
    • Resolution: Works as Designed
    • 2.2.0
    • None
    • API
    • spark 2.2.0
      MongoDB 3.4.7

    Description

      I want to use spark to insert DBRef, but I find only 24 digit number or characters can be inserted.

      Code sample:

      import org.apache.spark.SparkConf
      import org.apache.spark.SparkContext
      import com.mongodb.spark._
      import com.mongodb.spark.config._
      import org.bson.Document
      import org.apache.spark.sql.SparkSession
      import org.apache.spark.sql.types.StructField
      import org.apache.spark.sql.types.StringType
      import org.apache.spark.sql.types.StructType
      import org.apache.spark.sql.Row
      import org.apache.spark.sql.types.ArrayType
      import org.apache.spark.sql.types.IntegerType
      import org.apache.spark.sql.types.DataTypes
      import org.apache.spark.sql.types.MapType
      import org.apache.spark.sql.types.DateType
      import org.apache.spark.sql.types.DoubleType
      import org.apache.spark.sql.types.ObjectType
      import org.apache.spark.sql.types.DataType
      import org.apache.spark.sql.catalyst.expressions.Encode
      import org.apache.spark.rdd.RDD
       
      object MongoNestedDocTest {
        def main(args: Array[String]): Unit = {
          
            val sparkSession = SparkSession.builder()
            .master("local")
            .appName("MongoSparkConnector")
            .config("spark.mongodb.input.uri", "mongodb://bigdata:bigdata@servername:27017/bigdata")
            .config("spark.mongodb.output.uri", "mongodb://bigdata:bigdata@servername:27017/bigdata")
            .config("spark.mongodb.output.database", "bigdata")
            .getOrCreate()
            
          val nestedDBRefRDD = sparkSession.sparkContext.parallelize(
            Row("Warsaw", Array(Row("people", Row("100")), Row("people", Row("200")))) ::
            Row("Corted", Array(Row("people", Row("100")), Row("people", Row("200")))) ::
            Nil)
            
       
          val nestedDBRefSchemaRes = StructType(
            StructField("userName", StringType, false) ::
              StructField("dbRefId", ArrayType(StructType(
                  StructField("$ref", StringType, true) ::
                  StructField("$id", StructType(StructField("oid", StringType, true) :: Nil), false) ::
                  Nil))
                  ) :: Nil)
       
          val nestedDBRefDF = sparkSession.createDataFrame(nestedDBRefRDD, nestedDBRefSchemaRes)
          nestedDBRefDF.show()
          nestedDBRefDF.write.option("collection", "rddMerge").mode("overwrite").format("com.mongodb.spark.sql").save()
       
        }
      }
       
      You will see the following exception:
      {color:red}Caused by: com.mongodb.spark.exceptions.MongoTypeConversionException: Cannot cast [100] into a StructType(StructField(oid,StringType,true))
      	at com.mongodb.spark.sql.MapFunctions$.com$mongodb$spark$sql$MapFunctions$$convertToBsonValue(MapFunctions.scala:92)
      	at com.mongodb.spark.sql.MapFunctions$$anonfun$rowToDocument$1.apply(MapFunctions.scala:59)
      	at com.mongodb.spark.sql.MapFunctions$$anonfun$rowToDocument$1.apply(MapFunctions.scala:57)
      	at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
      	at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:186)
      	at com.mongodb.spark.sql.MapFunctions$.rowToDocument(MapFunctions.scala:57)
      	at com.mongodb.spark.sql.MapFunctions$$anonfun$8.apply(MapFunctions.scala:177){color}
       
      If you change data into 24 digit number or characters such as below, it works fine.
       
          val nestedDBRefRDD = sparkSession.sparkContext.parallelize(
            Row("Warsaw", Array(Row("people", Row("59b61d2487aa56da25cb9034")), Row("people", Row("599fccd2b9a88e237cb1597c")))) ::
            Row("Corted", Array(Row("people", Row("599fcd76b9a88e237cb1597f")), Row("people", Row("599fccffb9a88e237cb1597d")))) ::
            Nil)
      

      I really don't want to use so long objectId as DBRef. Is it a bug? Could you do me a favor?

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            ross@mongodb.com Ross Lawley
            windshjw windshjw
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              Created:
              Updated:
              Resolved: