How can anyone recover deleted HDFS data

Question

I have a Hadoop cluster and by mistake, I have deleted a file from HDFS. So, I want to know whether the file which we delete from the HDFS is deleted permanently or is it kept somewhere else. Is it similar to Windows, where the file is stored in the recycle bin? And if it is, then how can I recover the data back in HDFS.

Answer 1

Yes, there is a trash policy in HDFS, where the file is stored in .Trash directory once they are deleted. But you have to check whether the trash policy is activated or not. Check whether the fs.trash.interval > 1.

If this property is set, then you can locate the file in .Trash directory. Generally you’ll find the directory in /user/username/.Trash

If you have not enabled the trash policy then you need to go ahead use data recovery tool, to recover the lost data.