[OAK-3055] Improve segment cache in SegmentTracker - ASF JIRA

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Details

Type: Improvement
Status: Closed
Priority: Major
Resolution: Fixed
Affects Version/s: None
Fix Version/s: 1.3.3, 1.4
Component/s: segmentmk
Labels:

Description

The hand crafted segment cache in SegmentTracker is prone to lock contentions in concurrent access scenarios. As SegmentNodeStore#merge might also end up acquiring this lock while holding the commit semaphore the situation can easily lead to many threads being blocked on the commit semaphore. The SegmentTracker cache doesn't differentiate between read and write access, which means that reader threads can block writer threads.