[OAK-6886] OffRC always logs 0 for the number of compacted nodes in gc.log

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.7.12, 1.8.0
• Component/s: segment-tar
• Labels: compaction gc tooling
• Epic Link: TarMK GC scalability
• Assignee: Francesco Mari
• Reporter: Michael Dürig
• Created: 31/Oct/17 10:57
• Updated: 08/Dec/17 14:23
• Resolved: 21/Nov/17 16:01

Description

After an offline compaction the gc.log always contains 0 for the number of compacted nodes. This is caused by org.apache.jackrabbit.oak.segment.tool.Compact.compact() instantiating a new FileStore to run cleanup. That file store has new GCMonitor instance, which did no see any of the nodes written by the compaction that was run on the previous FileStore instance.

Issue Links

• is blocked by: OAK-6909 FileStore.compact does not persist compacted head to journal
• is blocked by: OAK-6910 Offline compaction should not use mmap on Windows
• is related to: OAK-6894 org.apache.jackrabbit.oak.segment.upgrade.UpgradeIT.offRCUpgradesSegments failing