[OAK-3550] Add meta data to segments

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.3.10, 1.4
• Component/s: segmentmk
• Epic Link: SegmentMK revision GC
• Assignee: Michael Dürig
• Reporter: Michael Dürig
• Created: 26/Oct/15 11:03
• Updated: 20/Apr/16 12:47
• Resolved: 27/Oct/15 11:21

Description

For various kinds of tooling it would be good to have additional meta data available within segments. Like which segment writer wrote (i.e. system or compaction) the segment, a time stamp, the revision gc generation etc.

Such meta data could live in a regular String record right at the beginning of the segment. As such it would always occupy the first slot of the root records and would be very easy to get to in tooling. Additionally it would be written as regular content and thus wouldn't require any changes in the segment format.

Issue Links

• blocks: OAK-4256 CLONE - Cross gc sessions might introduce references to pre-compacted segments
• blocks: OAK-3348 Cross gc sessions might introduce references to pre-compacted segments