1、window操作系统的eclipse运行wordcount程序出现如下所示的错误:
Exception in thread "main" java.lang.UnsatisfiedLinkError: org.apache.hadoop.io.nativeio.NativeIO$Windows.access0(Ljava/lang/String;I)Z
at org.apache.hadoop.io.nativeio.NativeIO$Windows.access0(Native Method)
at org.apache.hadoop.io.nativeio.NativeIO$Windows.access(NativeIO.java:)
at org.apache.hadoop.fs.FileUtil.canRead(FileUtil.java:)
at org.apache.hadoop.util.DiskChecker.checkAccessByFileMethods(DiskChecker.java:)
at org.apache.hadoop.util.DiskChecker.checkDirAccess(DiskChecker.java:)
at org.apache.hadoop.util.DiskChecker.checkDir(DiskChecker.java:)
at org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.confChanged(LocalDirAllocator.java:)
at org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.getLocalPathForWrite(LocalDirAllocator.java:)
at org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:)
at org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:)
at org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:)
at org.apache.hadoop.mapred.LocalDistributedCacheManager.setup(LocalDistributedCacheManager.java:)
at org.apache.hadoop.mapred.LocalJobRunner$Job.<init>(LocalJobRunner.java:)
at org.apache.hadoop.mapred.LocalJobRunner.submitJob(LocalJobRunner.java:)
at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:)
at org.apache.hadoop.mapreduce.Job$.run(Job.java:)
at org.apache.hadoop.mapreduce.Job$.run(Job.java:)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Unknown Source)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:)
at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:)
at com.bie.hadoop.wordcount.WordCountRunner2.run(WordCountRunner2.java:)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:)
at com.bie.hadoop.wordcount.WordCountRunner2.main(WordCountRunner2.java:)
暂时解决方法如下所示：
Windows的唯一方法用于检查当前进程的请求，在给定的路径的访问权限，所以我们先给以能进行访问，我们自己先修改源代码，return true 时允许访问。我们下载对应hadoop源代码，hadoop-2.6.0-src.tar.gz解压，D:\biexiansheng\hadoop\hadoop-2.5.0-cdh5.3.6-src\hadoop-2.5.0-cdh5.3.6\hadoop-common-project\hadoop-common\src\main\java\org\apache\hadoop\io\nativeio下NativeIO.java 复制到对应的Eclipse的project，然后修改557行为return true如图所示：
注意：包的路径必须这样，不能变：
