apache-spark - Spark : load or select Hive table of ORC format

Question

我正在尝试使用 spark sql 加载以 ORC 格式创建的托管配置单元表。

SparkConf conf = new SparkConf().setAppName(ConnectionTest.class.getName()).setMaster(master);
JavaSparkContext context = new JavaSparkContext(conf);

SQLContext sqlContext = new HiveContext(context);

sqlContext.sql("SELECT * FROM schema.tableName").show(20);

但是我收到了这个错误:

Exception in thread "main" java.lang.RuntimeException: serious problem
    at org.apache.hadoop.hive.ql.io.orc.OrcInputFormat.generateSplitsInfo(OrcInputFormat.java:1021)
    at org.apache.hadoop.hive.ql.io.orc.OrcInputFormat.getSplits(OrcInputFormat.java:1048)
    at org.apache.spark.rdd.HadoopRDD.getPartitions(HadoopRDD.scala:199)
    at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:242)
    at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:240)
    at scala.Option.getOrElse(Option.scala:120)
    at org.apache.spark.rdd.RDD.partitions(RDD.scala:240)
    at org.apache.spark.rdd.HadoopRDD$HadoopMapPartitionsWithSplitRDD.getPartitions(HadoopRDD.scala:381)
    at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:242)
    at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:240)
    at scala.Option.getOrElse(Option.scala:120)
    at org.apache.spark.rdd.RDD.partitions(RDD.scala:240)
    at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:35)
    at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:242)
    at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:240)
    at scala.Option.getOrElse(Option.scala:120)
    at org.apache.spark.rdd.RDD.partitions(RDD.scala:240)
    at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:35)
    at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:242)
    at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:240)
    at scala.Option.getOrElse(Option.scala:120)
    at org.apache.spark.rdd.RDD.partitions(RDD.scala:240)
    at org.apache.spark.sql.execution.SparkPlan.executeTake(SparkPlan.scala:190)
    at org.apache.spark.sql.execution.Limit.executeCollect(basicOperators.scala:165)
    at org.apache.spark.sql.execution.SparkPlan.executeCollectPublic(SparkPlan.scala:174)
    at org.apache.spark.sql.DataFrame$$anonfun$org$apache$spark$sql$DataFrame$$execute$1$1.apply(DataFrame.scala:1499)
    at org.apache.spark.sql.DataFrame$$anonfun$org$apache$spark$sql$DataFrame$$execute$1$1.apply(DataFrame.scala:1499)
    at org.apache.spark.sql.execution.SQLExecution$.withNewExecutionId(SQLExecution.scala:56)
    at org.apache.spark.sql.DataFrame.withNewExecutionId(DataFrame.scala:2086)
    at org.apache.spark.sql.DataFrame.org$apache$spark$sql$DataFrame$$execute$1(DataFrame.scala:1498)
    at org.apache.spark.sql.DataFrame.org$apache$spark$sql$DataFrame$$collect(DataFrame.scala:1505)
    at org.apache.spark.sql.DataFrame$$anonfun$head$1.apply(DataFrame.scala:1375)
    at org.apache.spark.sql.DataFrame$$anonfun$head$1.apply(DataFrame.scala:1374)
    at org.apache.spark.sql.DataFrame.withCallback(DataFrame.scala:2099)
    at org.apache.spark.sql.DataFrame.head(DataFrame.scala:1374)
    at org.apache.spark.sql.DataFrame.take(DataFrame.scala:1456)
    at org.apache.spark.sql.DataFrame.showString(DataFrame.scala:170)
    at org.apache.spark.sql.DataFrame.show(DataFrame.scala:350)
    at org.apache.spark.sql.DataFrame.show(DataFrame.scala:311)
    at com.daimler.dbdp.spark.ConnectionTest.run(ConnectionTest.java:45)
    at com.daimler.dbdp.spark.ConnectionTest.main(ConnectionTest.java:26)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:731)
    at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:181)
    at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:206)
    at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:121)
    at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.lang.NullPointerException
        at org.apache.hadoop.hive.ql.io.orc.OrcInputFormat$BISplitStrategy.getSplits(OrcInputFormat.java:560)
        at org.apache.hadoop.hive.ql.io.orc.OrcInputFormat.generateSplitsInfo(OrcInputFormat.java:1010)
        ... 49 more

好像是跟ORC格式有关的东西。使用 ORC 格式时访问 Hive 表的最佳方式是什么？

谢谢!!!

Spark 1.6.2。Java 8霍顿工厂区。

Answer 1

你可以尝试在spark中设置以下参数

scala> sql("set spark.sql.hive.convertMetastoreOrc=true") 
// output = res3: org.apache.spark.sql.DataFrame = [key: string, value: string] 

然后在spark中对ORC表执行查询。

如果在设置上面的参数后你也遇到问题，你可以尝试设置下面的参数。

scala> sql("set spark.sql.orc.impl=native")
// output = res4: org.apache.spark.sql.DataFrame = [key: string, value: string]