Eclipse運作Spark程式報錯No FileSystem for scheme: hdfs

場景：通過spark程式讀取hdfs檔案。

錯誤：

Exception in thread "main" java.io.IOException: No FileSystem for scheme: hdfs
	at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2385)
	at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2392)
	at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:89)
	at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2431)
	at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2413)
	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:368)
	at org.apache.hadoop.fs.Path.getFileSystem(Path.java:296)
	at org.apache.spark.sql.execution.datasources.DataSource$$anonfun$14.apply(DataSource.scala:372)
	at org.apache.spark.sql.execution.datasources.DataSource$$anonfun$14.apply(DataSource.scala:370)
	at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)
	at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)
	at scala.collection.immutable.List.foreach(List.scala:381)
	at scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:241)
	at scala.collection.immutable.List.flatMap(List.scala:344)
	at org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:370)
	at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:152)
	at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:135)
	at ......main(Example.java:25)
           

原因：缺少hadoop-hdfs包，在hadoop-common和hadoop-hdfs包的META-INF\services下均有一個org.apache.hadoop.fs.FileSystem檔案，但檔案内容是不同的。

解決辦法：引入hadoop-hdfs包。