[HDDS-2940] mkdir : create key table entries for intermediate directories in the path

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.5.0
• Component/s: Ozone Manager
• Labels: pull-request-available
• Assignee: Supratim Deka
• Reporter: Supratim Deka
• Created: 27/Jan/20 16:33
• Updated: 02/Jun/20 19:14
• Resolved: 27/Feb/20 04:40

Description

During mkdir - the directory create request handler in the OM, create separate key table entries for each of the directories in the path.

This will ensure that every directory that exists in the FS namespace is explicitly listed as an entry in the key table - instead of being implicit as part of the key of the leaf level directory or file.

This subsequently makes file create operation efficient - there is no requirement to run an expensive iterator on the key table to determine if the file name already exists as a directory.

Issue Links

• is duplicated by: HDDS-2301 Write path: Reduce read contention in rocksDB
• relates to: HDDS-3054 OzoneFileStatus#getModificationTime should return actual directory modification time when its OmKeyInfo is available
• links to: GitHub Pull Request #498