报错信息
org.apache.hadoop.fs.UnsupportedFileSystemException: No FileSystem for scheme "hdfs"
at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:3281)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:3301)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:124)
at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:3352)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:3320)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:479)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:227)
at com.courage.hadoop.TestHdfs.conn(TestHdfs.java:22)
java.lang.NullPointerException
at com.courage.hadoop.TestHdfs.close(TestHdfs.java:32)
原因
jar包或打包问题
Different JARs (hadoop-commons for LocalFileSystem, hadoop-hdfs for DistributedFileSystem) each contain a different file called org.apache.hadoop.fs.FileSystem in their META-INFO/servicesdirectory. This file lists the canonical classnames of the filesystem implementations they want to declare (This is called a Service Provider Interface implemented via java.util.ServiceLoader, see org.apache.hadoop.FileSystem line 2622).
When we use maven-assembly-plugin, it merges all our JARs into one, and all META-INFO/services/org.apache.hadoop.fs.FileSystem overwrite each-other. Only one of these files remains (the last one that was added). In this case, the FileSystem list from hadoop-commonsoverwrites the list from hadoop-hdfs, so DistributedFileSystem was no longer declared.
解决办法
1.通过配置方式:
Java代码
这个解决hdfs问题 | |
---|---|
hadoopConf.set("fs.hdfs.impl", org.apache.hadoop.hdfs.DistributedFileSystem.class.getName()); |
这个解决本地file问题 | |
---|---|
hadoopConf.set("fs.file.impl", org.apache.hadoop.fs.LocalFileSystem.class.getName()); |
2.通过打包插件方式
Xml代码
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.3</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
- UnsupportedFileSystemException quot FileSystem Hadoop apacheunsupportedfilesystemexception quot filesystem hadoop apache org rpcnosuchprotocolexception getjavaproperty apache hadoop hbase springboot数据apache hadoop module quot apache-jmeter desktop nosuchelementexception quot mapreduce hadoop unsupportedfilesystemexception filesystem boost_filesystem boost_filesystem configuration filesystem provided