I am using
hdfs dfs -put myfile mypath
and for some files I get
put: \'myfile\': File Exists
You can overwrite your file in hdfs using -f command.For example
hadoop fs -put -f <localfile> <hdfsDir>
OR
hadoop fs -copyFromLocal -f <localfile> <hdfsDir>
It worked fine for me. However -f command won't work in case of get or copyToLocal command. check this question
Just updates to this answer, in Hadoop 3.X the command a bit different
hdfs dfs -put -f /local/to/path hdfs://localhost:9870/users/XXX/folder/folder2
put: 'myfile': File Exists
Means,the file named "myfile" already exists in hdfs. You cannot have multiple files of the same name in hdfs
You can overwrite it using hadoop fs -put -f /path_to_local /path_to_hdfs