我正在尝试自学一些 hadoop 基础知识，因此构建了一个简单的 hadoop 集群。这有效，我可以从 hdfs 文件系统中放入 ls 和 cat ，没有任何问题。所以我采取了下一步并尝试对我放入 hadoop 的文件进行字数统计，但出现以下错误
$ hadoop jar /home/hadoop/share/hadoop/mapreduce/*examples*.jar wordcount data/sectors.txt results
2018-06-06 07:57:36,936 INFO client.RMProxy: Connecting to ResourceManager at ansdb1/10.49.17.12:8040
2018-06-06 07:57:37,404 INFO mapreduce.JobResourceUploader: Disabling Erasure Coding for path: /tmp/hadoop-yarn/staging/hadoop/.staging/job_1528191458385_0014
2018-06-06 07:57:37,734 INFO input.FileInputFormat: Total input files to process : 1
2018-06-06 07:57:37,869 INFO mapreduce.JobSubmitter: number of splits:1
2018-06-06 07:57:37,923 INFO Configuration.deprecation: yarn.resourcemanager.system-metrics-publisher.enabled is deprecated. Instead, use yarn.system-metrics-publisher.enabled
2018-06-06 07:57:38,046 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1528191458385_0014
2018-06-06 07:57:38,048 INFO mapreduce.JobSubmitter: …