Exception in thread "main" org.apache.hadoop.hdfs.BlockMissingException: Could not obtain block: BP-1124468226-10.0.2.15-1429879726015:blk_1073742186_1370 file=/user/testdir/yarn-site.xml

    at org.apache.hadoop.hdfs.DFSInputStream.chooseDataNode(DFSInputStream.java:889)

    at org.apache.hadoop.hdfs.DFSInputStream.fetchBlockByteRange(DFSInputStream.java:998)

    at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:1333)

    at org.apache.hadoop.fs.FSInputStream.readFully(FSInputStream.java:78)

    at org.apache.hadoop.fs.FSDataInputStream.readFully(FSDataInputStream.java:116)

    at com.hdfs.file.ReadFile.main(ReadFile.java:24)、

代码如下，在windows机器上运行，报上面的错误：

package com.hdfs.file;import org.apache.hadoop.conf.Configuration;import org.apache.hadoop.fs.FSDataInputStream;import org.apache.hadoop.fs.FileStatus;import org.apache.hadoop.fs.FileSystem;import org.apache.hadoop.fs.Path;public class ReadFile {    /**     * @param args     * @throws Exception      */    public static void main(String[] args) throws Exception {        // TODO Auto-generated method stub        Configuration conf=new Configuration();        FileSystem fs=FileSystem.get(conf);        Path path=new Path("hdfs://sandbox.hortonworks.com:8020/user/testdir/yarn-site.xml");        if(fs.exists(path)){            FSDataInputStream fsIn=fs.open(path);            FileStatus status=fs.getFileStatus(path);            byte[] buffer=new byte[Integer.parseInt(String.valueOf(status.getLen()))];            fsIn.readFully(0,buffer);            fsIn.close();            fs.close();            System.out.println("读取完成!");            System.out.println(new String(buffer));        }else{            throw new Exception("the file is not found!");        }    }}

 

将代码打成Jar包，放到hadoop集群上去运行，一切正常：