Yes, certainly, if you only need it in one spot, then -mv is a fast metadata-only operation. I was under the impression that Gavin really wanted to achieve 2 distinct copies. Perhaps I was mistaken.
--Chris Nauroth From: sandeep vura <[email protected]<mailto:[email protected]>> Date: Sunday, January 10, 2016 at 6:23 AM To: Chris Nauroth <[email protected]<mailto:[email protected]>> Cc: Gavin Yue <[email protected]<mailto:[email protected]>>, "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: Re: how to quickly fs -cp dir with thousand files? Hi Chris, Instead of copying files . Use mv command . * hadoop fs -mv /user/hadoop/file1 /user/hadoop/file2 Sandeep.v On Sat, Jan 9, 2016 at 9:55 AM, Chris Nauroth <[email protected]<mailto:[email protected]>> wrote: DistCp is capable of running large copies like this in distributed fashion, implemented as a MapReduce job. http://hadoop.apache.org/docs/r2.7.1/hadoop-distcp/DistCp.html A lot of the literature on DistCp talks about use cases for copying across different clusters, but it's also completely legitimate to run DistCp within the same cluster. --Chris Nauroth From: Gavin Yue <[email protected]<mailto:[email protected]>> Date: Friday, January 8, 2016 at 4:45 PM To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: how to quickly fs -cp dir with thousand files? I want to cp a dir with over 8000 files to another dir in the same hdfs. but the copy process is really slow since it is copying one by one. Is there a fast way to copy this using Java FileSystem or FileUtil api? Thanks.
