[OAK-2801] Clear excess references before cleanup

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.0.15, 1.2.3, 1.3.0, 1.4
• Component/s: segmentmk
• Labels: compaction gc resilience
• Epic Link: SegmentMK revision GC
• Assignee: Michael Dürig
• Reporter: Michael Dürig
• Created: 22/Apr/15 11:24
• Updated: 02/Mar/16 11:28
• Resolved: 05/Jun/15 14:51

Description

FileStore#cleanup would be more efficient when getting rid of as much references as possibly beforehand. Excess references are contributed by the current TarWriter instance and segment cache in SegmentTracker.

Those excess references turn out to be especially harmful with many concurrent writers continuously writing to the repository. Starting with a certain write load clean up will become completely blocked.

Issue Links

• is related to: OAK-2734 Compaction does not finish on repository with continuous writes
• is related to: OAK-2967 Merge OAK-2800, OAK-2801, OAK-2692, OAK-2713
• relates to: OAK-2967 Merge OAK-2800, OAK-2801, OAK-2692, OAK-2713