[HDFS-11917] Why when using the hdfs nfs gateway, a file which is smaller than one block size required a block

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 2.8.0
• Component/s: nfs
• Assignee: Weiwei Yang
• Reporter: BINGHUI WANG
• Created: 02/Jun/17 09:52
• Updated: 05/Jun/17 07:17
• Resolved: 02/Jun/17 10:21

Description

I use the linux shell to put the file into the hdfs throuth the hdfs nfs gateway. I found that if the file which size is smaller than one block(128M), it will still takes one block(128M) of hdfs storage by this way. But after a few minitues the excess storage will be released.
e.g:If I put the file(60M) into the hdfs throuth the hdfs nfs gateway, it will takes one block(128M) at first. After a few minitues the excess storage(68M) will
be released. The file only use 60M hdfs storage at last.
Why is will be this?