[HADOOP-17748] s3a listing IOStatistics to count #of entries returned per LIST call

• Type: Sub-task
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 3.3.1
• Component/s: fs/s3
• Assignee: Unassigned
• Reporter: Steve Loughran
• Created: 04/Jun/21 09:21
• Updated: 04/Oct/22 16:23

Description

Extend IOStatistics tracking for the S3A Listing operations to count the #of object entries returned in a LIST call. This would be interesting when working with versioned buckets, to see what the actual page size of a listing is, so understand how it behaves there, and maybe get some estimate of how many old versions/tombstones are being skipped.

MUST: add to S3AFS stats, SHOULD add to Listing