Minor Description
The default value of fs.s3a.connection.timeout is 50000 milliseconds. It causes many SocketTimeoutException when uploading large files using hadoop fs -put.
Also, the units for fs.s3a.connection.timeout and fs.s3a.connection.estaablish.timeout are milliseconds. For s3 connections, I think it is not necessary to have sub-seconds timeout value. Thus I suggest to change the time unit to seconds, to easy sys admin's job.