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问题描述
我正在使用 Spark-MongoDB我正在尝试将 DataFrame 保存到 MongoDB 中:
I am using Spark-MongoDBand I am trying to save a DataFrame into MongoDB :
val event = """{"Dev":[{"a":3},{"b":3}],"hr":[{"a":6}]}"""
val events = sc.parallelize(event :: Nil)
val df = sqlc.read.json(events)
val saveConfig = MongodbConfigBuilder(Map(Host -> List("localhost:27017"),
Database -> "test", Collection -> "test", SamplingRatio -> 1.0, WriteConcern -> "normal",
SplitSize -> 8, SplitKey -> "_id"))
df.saveToMongodb(saveConfig.build)
我希望将数据保存为输入字符串，但实际保存的是:
I'm expecting the data to be saved as the input string, but what is actually saved is:
{ "_id" : ObjectId("57cedf4bd244c56e8e783a45"), "Dev" : [ { "a" : NumberLong(3), "b" : null }, { "a" : null, "b" : NumberLong(3) } ], "hr" : [ { "a" : NumberLong(6) } ] }
我想避免那些空值和重复项，知道吗?
I want to avoid those null values and duplicates, Any idea?
推荐答案
您是否尝试过使用反斜杠定义如下事件:
Have you tried event defined as below using backslash:
val event = "{\"Dev\":[{\"a\":3},{\"b\":3}],\"hr\":[{\"a\":6}]}"
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