WIP Alert This is a work in progress. Current information is correct but more content may be added in the future.
Truncate a file
I.e. reduce its size but don't delete it. This is useful to delete large log files, avoiding crashing applications that expect the file to exist.
$ hadoop fs -truncate -w 100 /path/to/file
touchz in HDFS.
$ hadoop fs -touchz /path/to/file