[BEAM-5910] FileSystems should retrieve lastModified time

• Type: Improvement
• Status: Resolved
• Priority: P3
• Resolution: Fixed
• Fix Version/s: 2.11.0
• Component/s: sdk-java-core
• Labels: Done
• Assignee: Jeff Klukas
• Reporter: Jeff Klukas
• Created: 29/Oct/18 17:55
• Updated: 06/Oct/20 21:51
• Resolved: 18/Jan/19 09:26

Description

In the Java SDK, the Filesystems.match facilities are aimed at listing file names and collect very limited additional metadata from the filesystem (sizeBytes and isReadSeekEfficient). I propose adding a new field for lastModified time to MatchResult.Metadata that each FileSystem would populate when listing files.

This would be a basis for a future improvement to FileIO.match(...).continuously(...) where we could let the user opt to poll not just for new file names, but also for existing file names if their content has been updated.

In the near term, the addition of lastModified to Metadata would allow users to implement their own polling logic on top of Filesystems.match to detect and download new files from any of the supported filesystems.

Issue Links

• links to: GitHub Pull Request #6914