In Hadoop 2.7.0 core-default page: https://hadoop.apache.org/docs/r2.7.0/hadoop-project-dist/hadoop-common/core-default.xml
Variables: fs.s3*a*.awsSecretAccessKey and fs.s3*a*.awsAccessKeyId are wrong. *s3a* should be s3 only. So they should be: fs.s3.awsSecretAccessKey and fs.s3.awsAccessKeyId
