[HDDS-5450] Avoid refresh pipeline for S3 headObject

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.2.0
• Component/s: OM, S3
• Labels: pull-request-available
• Assignee: Bharat Viswanadham
• Reporter: Bharat Viswanadham
• Created: 16/Jul/21 07:25
• Updated: 02/Aug/22 00:23
• Resolved: 27/Jul/21 15:28

Description

S3 head uses OM API lookup key which refreshes pipeline info by contacting SCM.

For S3 head we donot require any pipeline info, we need very basic details like length, type, etag and last modification time.

By removing pipeline info which is not required for HEAD object, HEAD API performance can be improved.

This is identified during looking up graphs from kerneltime testing

Issue Links

• is duplicated by: HDDS-6831 Ozone need not set pipeline/blockToken detail when doing listKey/lookup
• links to: GitHub Pull Request #2431