MapReduce，FileNotFoundException

Question

Hadoop 2.9.1，独立安装。

hdfs 目录按时间组织 (yyyyMMdd/HH/mm)，例如 hdfs://server1:9000/foo/20190410/10/00。而且每分钟有好几个文件。

我需要做的是，处理每个小时的数据，比如处理hdfs://server1:9000/foo/20190410/10下的所有数据。所以 mapreduce 输入设置类似于

job.setInputFormatClass(org.apache.hadoop.mapreduce.lib.input.SequenceFileAsBinaryInputFormat.class);
    Path inputPath = new Path("hdfs://server1:9000/foo/20190410/10");
    org.apache.hadoop.mapreduce.lib.input.SequenceFileAsBinaryInputFormat.addInputPath(job, inputPath);

但我一直收到这个，

Exception in thread "main" java.io.FileNotFoundException: File does not exist: hdfs://server01:9000/foo/20190410/10/00/data
        at org.apache.hadoop.hdfs.DistributedFileSystem.doCall(DistributedFileSystem.java:1533)
        at org.apache.hadoop.hdfs.DistributedFileSystem.doCall(DistributedFileSystem.java:1526)
        at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
        at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1526)
        at org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat.listStatus(SequenceFileInputFormat.java:67)
        at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.getSplits(FileInputFormat.java:393)
        at org.apache.hadoop.mapreduce.JobSubmitter.writeNewSplits(JobSubmitter.java:314)
        at org.apache.hadoop.mapreduce.JobSubmitter.writeSplits(JobSubmitter.java:331)
        at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:202)
        at org.apache.hadoop.mapreduce.Job.run(Job.java:1570)
        at org.apache.hadoop.mapreduce.Job.run(Job.java:1567)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1889)
        at org.apache.hadoop.mapreduce.Job.submit(Job.java:1567)
        at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1588)
        at com.misc.mr.TestJob.main(TestJob.java:54)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.hadoop.util.RunJar.run(RunJar.java:239)
        at org.apache.hadoop.util.RunJar.main(RunJar.java:153)

我不知道为什么它会尝试访问路径 hdfs://server01:9000/foo/20190410/10/00/data

如果输入的是文件而不是文件夹（例如hdfs://server1:9000/foo/20190410/10/00/part1），它工作正常。

谁能帮忙解释一下？非常感谢。

Answer 1

想通了。

将 mapreduce.input.fileinputformat.input.dir.recursive 设置为真。

或

在代码中调用，FileInputFormat.setInputDirRecursive(job, true)

MapReduce，FileNotFoundException

MapReduce, FileNotFoundException

hadoop

mapreduce