显示文件数
代码语言：javascript复制hdfs dfs -count -q /spark2-history
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显示文件夹下文件总大小 -s -h
代码语言：javascript复制hdfs dfs -du -s -h /spark2-history
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显示文件由那些块构成
代码语言：javascript复制hdfs fsck /spark2-history/application_1608084068201_452033_1 -files -blocks -racks显示文件由那些块构成 -files：显示文件的文件名称、大小、块数量及是否可用； -blocks： 显示每个块在文件中的信息，一个块用一行显示； -racks： 展示了每个块所处的机架位置及DataNode的位置；
代码语言：javascript复制Connecting to namenode via http://bigdata002.yyy.com.cn:50070/fsck?ugi=hdfs&files=1&blocks=1&racks=1&path=/spark2-history/application_1608084068201_452033_1
FSCK started by hdfs (auth:KERBEROS_SSL) from /172.16.255.20 for path /spark2-history/application_1608084068201_452033_1 at Mon Dec 28 21:47:50 CST 2020
/spark2-history/application_1608084068201_452033_1 1692130 bytes, 1 block(s): OK
0. BP-86590029-172.16.255.20-1578389062797:blk_2163930329_1090575119 len=1692130 Live_repl=2 [/default-rack/172.16.254.158:1019, /default-rack/172.16.254.138:1019]
Status: HEALTHY
Total size: 1692130 B
Total dirs: 0
Total files: 1
Total symlinks: 0
Total blocks (validated): 1 (avg. block size 1692130 B)
Minimally replicated blocks: 1 (100.0 %)
Over-replicated blocks: 0 (0.0 %)
Under-replicated blocks: 0 (0.0 %)
Mis-replicated blocks: 0 (0.0 %)
Default replication factor: 2
Average block replication: 2.0
Corrupt blocks: 0
Missing replicas: 0 (0.0 %)
Number of data-nodes: 100
Number of racks: 1
FSCK ended at Mon Dec 28 21:47:50 CST 2020 in 14 milliseconds
The filesystem under path '/spark2-history/application_1608084068201_452033_1' is HEALTHY
