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via Google Groups by Ammar Shadiq, 1 year ago
java.lang.UnsupportedOperationException: 
MongoCollection already exists	at com.mongodb.spark.sql.DefaultSource.createRelation(DefaultSource.scala:99)	at com.mongodb.spark.sql.DefaultSource.createRelation(DefaultSource.scala:38)	at org.apache.spark.sql.execution.datasources.ResolvedDataSource$.apply(ResolvedDataSource.scala:222)	at org.apache.spark.sql.DataFrameWriter.save(DataFrameWriter.scala:148)