[OAK-5029] Use head GC generation number to trigger cleanup on standby instance

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Segment Tar 0.0.16
• Fix Version/s: 1.5.13, 1.6.0
• Component/s: segment-tar
• Flags: Patch
• Assignee: Francesco Mari
• Reporter: Timothee Maret
• Created: 27/Oct/16 14:55
• Updated: 14/Nov/16 11:35
• Resolved: 28/Oct/16 09:05

Description

With oak-segment-tar, the trigger for running cleanup on the standby instance could be determined by the GC generation number of the head which is bound to increase every time a cleanup is ran.

fileStore.getHead().getRecordId().getSegment().getGcGeneration();

The current trigger mechanism consists of detecting a 25% size increase over a client cycle (typ. 5 sec).
This would be dropped in favor of the new detection mechanism.
The auto-compaction mode would remain configurable.