# 查看HDFS目錄內容
hadoop fs -ls /path

# 創建目錄
hadoop fs -mkdir /path/to/dir

# 上傳本地文件到HDFS
hadoop fs -put localfile /hdfs/path

# 下載HDFS文件到本地
hadoop fs -get /hdfs/path localfile

# 查看文件內容
hadoop fs -cat /hdfs/path/file

# 刪除文件/目錄
hadoop fs -rm /hdfs/path/file
hadoop fs -rm -r /hdfs/path/dir

# 查看文件大小
hadoop fs -du -h /hdfs/path

# 啟動HDFS
start-dfs.sh

# 停止HDFS
stop-dfs.sh

# 啟動YARN
start-yarn.sh

# 查看集群節點狀態
hdfs dfsadmin -report

# 查看正在運行的Job
yarn application -list

# 殺死某個Job
yarn application -kill <application_id>

# 檢查HDFS空間使用情況
hadoop fs -df -h

# 檢查文件塊信息
hadoop fsck /path -files -blocks

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