嗨，我正在阅读 spark 上下文中的 parquet 文件，然后合并各种 parquet 文件的模式。然后我保存从 read parquet 函数返回的数据帧并使用 write.parquet 命令保存。
Here is the code:
options:Map[String,String] = Map[String,String]()
val options2 = options.+("mergeSchema" -> "true")
df = sqc.read.options(options2).schema(schemaObj).parquet(paths:_*)
df.printSchema()
df.coalesce(1).write.parquet("/home/abc/")
这里 schemaObj 是 Parquet[StructType] 类型，它是从 AvroSchema 转换而来的
My sbt is as following:
"org.apache.spark" % "spark-core_2.10" % "1.6.0" %provided",
"org.apache.spark" % "spark-sql_2.10" % "1.6.0",
"com.amazonaws" % "aws-java-sdk" % "1.9.27",
"com.databricks" % "spark-avro_2.10" % "2.0.1",
"org.apache.avro" % "avro" % "1.7.6",
"io.confluent" % "kafka-avro-serializer" % "1.0",
"mysql" % "mysql-connector-java" % "5.1.6",
"io.confluent" %"kafka-schema-registry-client" % "2.0.1",
"com.twitter" %"parquet-avro" % "1.6.0"
I am getting following error:
Could not find creator property with name 'id' (in class org.apache.spark.rdd.RDDOperationScope)
at [Source: {"id":"0","name":"ExecutedCommand"}; line: 1, column: 1]
at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:148)
at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:843)
at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.addBeanProps(BeanDeserializerFactory.java:533)
at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.buildBeanDeserializer(BeanDeserializerFactory.java:220)
at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.createBeanDeserializer(BeanDeserializerFactory.java:143)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer2(DeserializerCache.java:409)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer(DeserializerCache.java:358)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:265)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:245)
at com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:143)
at com.fasterxml.jackson.databind.DeserializationContext.findRootValueDeserializer(DeserializationContext.java:439)
at com.fasterxml.jackson.databind.ObjectMapper._findRootDeserializer(ObjectMapper.java:3668)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3560)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2580)
at org.apache.spark.rdd.RDDOperationScope$.fromJson(RDDOperationScope.scala:85)
at org.apache.spark.rdd.RDD$$anonfun$34.apply(RDD.scala:1616)
at org.apache.spark.rdd.RDD$$anonfun$34.apply(RDD.scala:1616)
at scala.Option.map(Option.scala:145)
at org.apache.spark.rdd.RDD.<init>(RDD.scala:1616)
at org.apache.spark.rdd.SqlNewHadoopRDD.<init>(SqlNewHadoopRDD.scala:64)
at org.apache.spark.sql.execution.datasources.parquet.ParquetRelation$$anonfun$buildInternalScan$1$$anon$1.<init>(ParquetRelation.scala:327)
at org.apache.spark.sql.execution.datasources.parquet.ParquetRelation$$anonfun$buildInternalScan$1.apply(ParquetRelation.scala:327)
at org.apache.spark.sql.execution.datasources.parquet.ParquetRelation$$anonfun$buildInternalScan$1.apply(ParquetRelation.scala:327)
at org.apache.spark.util.Utils$.withDummyCallSite(Utils.scala:2165)
at org.apache.spark.sql.execution.datasources.parquet.ParquetRelation.buildInternalScan(ParquetRelation.scala:326)
at org.apache.spark.sql.sources.HadoopFsRelation.buildInternalScan(interfaces.scala:661)
at org.apache.spark.sql.execution.datasources.DataSourceStrategy$$anonfun$10.apply(DataSourceStrategy.scala:113)
at org.apache.spark.sql.execution.datasources.DataSourceStrategy$$anonfun$10.apply(DataSourceStrategy.scala:113)
at org.apache.spark.sql.execution.datasources.DataSourceStrategy$$anonfun$pruneFilterProject$1.apply(DataSourceStrategy.scala:274)
at org.apache.spark.sql.execution.datasources.DataSourceStrategy$$anonfun$pruneFilterProject$1.apply(DataSourceStrategy.scala:273)
at org.apache.spark.sql.execution.datasources.DataSourceStrategy$.pruneFilterProjectRaw(DataSourceStrategy.scala:352)
at org.apache.spark.sql.execution.datasources.DataSourceStrategy$.pruneFilterProject(DataSourceStrategy.scala:269)
at org.apache.spark.sql.execution.datasources.DataSourceStrategy$.apply(DataSourceStrategy.scala:109)
at org.apache.spark.sql.catalyst.planning.QueryPlanner$$anonfun$1.apply(QueryPlanner.scala:58)
at org.apache.spark.sql.catalyst.planning.QueryPlanner$$anonfun$1.apply(QueryPlanner.scala:58)
at scala.collection.Iterator$$anon$13.hasNext(Iterator.scala:371)
at org.apache.spark.sql.catalyst.planning.QueryPlanner.plan(QueryPlanner.scala:59)
at org.apache.spark.sql.execution.QueryExecution.sparkPlan$lzycompute(QueryExecution.scala:47)
at org.apache.spark.sql.execution.QueryExecution.sparkPlan(QueryExecution.scala:45)
at org.apache.spark.sql.execution.QueryExecution.executedPlan$lzycompute(QueryExecution.scala:52)
at org.apache.spark.sql.execution.QueryExecution.executedPlan(QueryExecution.scala:52)
at org.apache.spark.sql.execution.SQLExecution$.withNewExecutionId(SQLExecution.scala:53)
at org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelation.run(InsertIntoHadoopFsRelation.scala:108)
at org.apache.spark.sql.execution.ExecutedCommand.sideEffectResult$lzycompute(commands.scala:58)
at org.apache.spark.sql.execution.ExecutedCommand.sideEffectResult(commands.scala:56)
at org.apache.spark.sql.execution.ExecutedCommand.doExecute(commands.scala:70)
at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$5.apply(SparkPlan.scala:132)
at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$5.apply(SparkPlan.scala:130)
at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:150)
at org.apache.spark.sql.execution.SparkPlan.execute(SparkPlan.scala:130)
at org.apache.spark.sql.execution.QueryExecution.toRdd$lzycompute(QueryExecution.scala:55)
at org.apache.spark.sql.execution.QueryExecution.toRdd(QueryExecution.scala:55)
at org.apache.spark.sql.execution.datasources.ResolvedDataSource$.apply(ResolvedDataSource.scala:256)
at org.apache.spark.sql.DataFrameWriter.save(DataFrameWriter.scala:148)
at org.apache.spark.sql.DataFrameWriter.save(DataFrameWriter.scala:139)
at org.apache.spark.sql.DataFrame.saveAsParquetFile(DataFrame.scala:1837)