[HADOOP-12977] s3a to handle delete("/", true) robustly

• Type: Sub-task
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.9.0
• Fix Version/s: 2.8.0, 3.0.0-alpha2
• Component/s: fs/s3
• Target Version/s: 2.8.0
• Assignee: Steve Loughran
• Reporter: Steve Loughran
• Created: 30/Mar/16 15:07
• Updated: 19/Oct/16 01:05
• Resolved: 07/Oct/16 15:25

Description

if you try to delete the root directory on s3a, you get politely but firmly told you can't

2016-03-30 12:01:44,924 INFO  s3a.S3AFileSystem (S3AFileSystem.java:delete(638)) - s3a cannot delete the root directory

The semantics of rm -rf "/" are defined, they are "delete everything underneath, while preserving the root dir itself".

1. s3a needs to support this.
2. this skipped through the FS contract tests in AbstractContractRootDirectoryTest; the option of whether deleting / works or not should be made configurable.

Issue Links

• breaks: HADOOP-13713 ITestS3AContractRootDir.testRmEmptyRootDirNonRecursive failing intermittently
• is related to: HADOOP-13074 TestS3AContractRootDir#testListEmptyRootDirectory fails with java.io.IOException: Root directory operation rejected