[OAK-3372] Collapsing external events in BackgroundObserver even before queue is full leads to JournalEntry not getting used

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.3.5
• Fix Version/s: 1.0.25, 1.2.9, 1.3.10, 1.4
• Component/s: core
• Labels: performance resilience
• Assignee: Michael Dürig
• Reporter: Vikas Saurabh
• Created: 08/Sep/15 11:49
• Updated: 02/Mar/16 14:55
• Resolved: 04/Nov/15 08:28

Description

BackgroundObserver currently merges external events if the last one in queue is also an external event. This leads to diff being done for a revision pair which is different from the ones pushed actively into cache during backgroud read (using JournalEntry) i.e. diff queries for diff("/a/b", rA, rC) while background read had pushed results of diff("/a/b", rA, rB) and diff("/a/b", rB, rC).

(cc mreutegg, egli, chetanm, mduerig)

Issue Links

• is related to: OAK-3573 BackgroundObserver should decide about collapsing external events based on backend