我正试着在hadoop中测试。将代码作为: System.setProperty( “test.build.data”, “/文件夹”); config = new Configuration(); cluster = new MiniDFSCluster(config,1,true,null);
但在新的MiniDFSCluster(config,1,true,null)中,它抛出异常:
java.io.IOException: Cannot run program "du": CreateProcess error=2, The system cannot find the file specified.
at java.lang.ProcessBuilder.start(ProcessBuilder.java:470)
at org.apache.hadoop.util.Shell.runCommand(Shell.java:149)
at org.apache.hadoop.util.Shell.run(Shell.java:134)
at org.apache.hadoop.fs.DU.<init>(DU.java:53)
at org.apache.hadoop.fs.DU.<init>(DU.java:63)
at org.apache.hadoop.hdfs.server.datanode.FSDataset$FSVolume.<init>(FSDataset.java:333)
at org.apache.hadoop.hdfs.server.datanode.FSDataset.<init>(FSDataset.java:689)
at org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:302)
at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:216)
at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1283)
at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1238)
at org.apache.hadoop.hdfs.MiniDFSCluster.startDataNodes(MiniDFSCluster.java:417)
at org.apache.hadoop.hdfs.MiniDFSCluster.<init>(MiniDFSCluster.java:280)
at org.apache.hadoop.hdfs.MiniDFSCluster.<init>(MiniDFSCluster.java:124)
at ebay.Crawler.TestAll.testinit(TestAll.java:53)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:599)
at junit.framework.TestCase.runTest(TestCase.java:168)
at junit.framework.TestCase.runBare(TestCase.java:134)
at junit.framework.TestResult$1.protect(TestResult.java:110)
at junit.framework.TestResult.runProtected(TestResult.java:128)
at junit.framework.TestResult.run(TestResult.java:113)
at junit.framework.TestCase.run(TestCase.java:124)
at junit.framework.TestSuite.runTest(TestSuite.java:232)
at junit.framework.TestSuite.run(TestSuite.java:227)
at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:81)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified.
at java.lang.ProcessImpl.<init>(ProcessImpl.java:92)
at java.lang.ProcessImpl.start(ProcessImpl.java:41)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:463)
... 33 more
有人可以给我一些提示如何解决这个问题吗? 非常感谢你。
答案 0 :(得分:1)
答案 1 :(得分:1)
我怀疑你正在使用Hadoop的Cloudera发行版。版本1.0.0的'vanilla'Hadoop可以在Windows上运行 - 至少可以创建和写入文件。
如果您需要在本地Windows环境中运行单元测试,请尝试使用Maven配置文件属性在本地Maven配置中设置1.0.0
的版本,并在POM中指定“远程”配置。全局设置将覆盖特定于POM的设置。
的settings.xml
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
<profiles>
<profile>
<id>windows</id>
<properties>
<hadoop.version>1.0.0</hadoop.version>
</properties>
</profile>
</profiles>
<activeProfiles>
<activeProfile>windows</activeProfile>
</activeProfiles>
</settings>
的pom.xml
<properties>
<hadoop.version>0.20.2-cdh3u2</hadoop.version>
</properties>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-core</artifactId>
<version>${hadoop.version}</version>
</dependency>