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Hadoop 常用shell命令

Hadoop 常用shell命令

1. 檔案操作

  • 檢視檔案
    hadoop fs -ls /
[[email protected] logs]# hadoop fs -ls /
Found 2 items
drwxr-xr-x   - root supergroup          0 2018-12-18 11:25 /hbase
drwxr-xr-x   - root supergroup          0 2018-12-22 08:24 /input
  • 建立資料夾
    hadoop fs -mkdir /input
[[email protected]
logs]# hadoop fs -mkdir /test [[email protected] logs]# hadoop fs -ls / Found 3 items drwxr-xr-x - root supergroup 0 2018-12-18 11:25 /hbase drwxr-xr-x - root supergroup 0 2018-12-22 08:24 /input drwxr-xr-x - root supergroup 0 2018-12-22 08:27 /test
  • 刪除資料夾/檔案
[[email protected]
logs]# hadoop fs -rm -R /test 18/12/22 08:28:12 INFO fs.TrashPolicyDefault: Namenode trash configuration: Deletion interval = 0 minutes, Emptier interval = 0 minutes. Deleted /test [[email protected] logs]# hadoop fs -ls / Found 2 items drwxr-xr-x - root supergroup 0 2018-12-18 11:25 /hbase drwxr-xr-x - root supergroup 0 2018-12-22 08:24 /input
  • 使用hdfs dfs 上傳一個檔案到指定目錄下:
[[email protected] temp]# hdfs dfs -put data.txt /input/
[[email protected] temp]# hdfs dfs -ls /input/
Found 1 items
-rw-r--r--   3 root supergroup        108 2018-12-22 08:32 /input/data.txt
[[email protected] temp]# cat data.txt 
hadoop is a good platform to analyze big data in disk.
spark is a perfet tool to deal with big data in RAM.