在数据库的elasticSearch中,我有以下数据:
{
"titre": "Formation ElasticSearch",
"sous-titre": "Mon sous titre",
"formateurs": [
{
"prenom": "Martin",
"nom": "Legros"
}
],
"jours": 3,
"url": "http://test.fr"
}
formateurs是一群人。这里我们只有一个人。
我在pySpark上执行此映射:
person= StructType([
StructField("nom", StringType()),
StructField("prenom", StringType()),
])
schema= StructType([
StructField("titre", StringType()),
StructField("sous-titre", StringType()),
StructField("jours", LongType()),
StructField("url", StringType()),
StructField("formateurs", ArrayType(person)),
])
parcel= sqlContext.read.format("org.elasticsearch.spark.sql").schema(schema).load("zenika")
parcel.printSchema()
parcel.show(1)
我得到这个模式:
|-- titre: string (nullable = true)
|-- sous-titre: string (nullable = true)
|-- jours: long (nullable = true)
|-- url: string (nullable = true)
|-- formateurs: array (nullable = true)
| |-- element: struct (containsNull = true)
| | |-- nom: string (nullable = true)
| | |-- prenom: string (nullable = true)
在此示例中没有错误
但是,如果我添加一位格式化专家,则会出现一个错误。例如:
{
"titre": "Formation ElasticSearch",
"sous-titre": "Mon sous titre",
"formateurs": [
{
"prenom": "Martin",
"nom": "Legros"
},
{
"prenom": "Marc",
"nom": "Duchien"
}
],
"jours": 3,
"url": "http://test.fr"
}
我得到这个错误:
Caused by: org.elasticsearch.hadoop.EsHadoopIllegalStateException: Field 'formateurs.nom' not found; typically this occurs with arrays which are not mapped as single value
at org.elasticsearch.spark.sql.RowValueReader$class.rowColumns(RowValueReader.scala:51)
at org.elasticsearch.spark.sql.ScalaRowValueReader.rowColumns(ScalaEsRowValueReader.scala:32)
at org.elasticsearch.spark.sql.ScalaRowValueReader.createMap(ScalaEsRowValueReader.scala:69)
at org.elasticsearch.hadoop.serialization.ScrollReader.map(ScrollReader.java:968)
at org.elasticsearch.hadoop.serialization.ScrollReader.readListItem(ScrollReader.java:875)
at org.elasticsearch.hadoop.serialization.ScrollReader.list(ScrollReader.java:927)
at org.elasticsearch.hadoop.serialization.ScrollReader.read(ScrollReader.java:833)
at org.elasticsearch.hadoop.serialization.ScrollReader.map(ScrollReader.java:1004)
at org.elasticsearch.hadoop.serialization.ScrollReader.read(ScrollReader.java:846)
at org.elasticsearch.hadoop.serialization.ScrollReader.readHitAsMap(ScrollReader.java:602)
at org.elasticsearch.hadoop.serialization.ScrollReader.readHit(ScrollReader.java:426)
... 27 more
您能向我解释如何制作ArrayType,因为我没有找到具有复杂架构的教程。
非常感谢您。
编辑-----------------------
研究后,我发现了这一点
conf= SparkConf() \
.set("es.read.field.as.array.include", "formateurs.nom, ...") \
.set("es.nodes", "localhost") \
.set( "es.port", "9200") \
.set( "es.input.json", "yes")
sc = SparkContext(conf=conf)
只需将es.read.field.as.array.include添加到SparkContext的配置中。 可以添加用逗号分隔的嵌套对象