[ACCUMULO-4782] With many threads scanning seeing lock contention on SessionManager

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.7.3, 1.8.1
• Fix Version/s: 1.9.0
• Labels: pull-request-available
• Assignee: Keith Turner
• Reporter: Keith Turner
• Created: 12/Jan/18 21:29
• Updated: 23/Apr/19 16:13
• Resolved: 15/Feb/18 16:06

Description

While profiling many threads doing small scans against accumulo, lock contention on the tablet servers SessionManager was high.

Issue Links

• is related to: ACCUMULO-4811 Session manager does not always act on cleanUp() return
• is related to: ACCUMULO-4810 Make session manager reservations more strict
• relates to: ACCUMULO-4809 Session manager clean up can happen when lock held.
• links to: GitHub Pull Request #382