[JENA-703] TDB - Ensure readers don't block writeback forever.

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Workaround
• Affects Version/s: Jena 2.11.1
• Component/s: TDB
• Assignee: Andy Seaborne
• Reporter: Andy Seaborne
• Created: 23/May/14 14:24
• Updated: 08/Oct/18 20:29
• Resolved: 09/Jun/18 18:05

Description

The commit queue can only be flushed when the main storage is quiet. A stream of readers can lead to the main storage never being quiet.

One possibility is to place a maximum (quite high) on the number of readers allowed after the decision to flush the journal to main storage. If exceeded, then lock readers for a while, flush and resume.

Issue Links

• is related to: JENA-485 TDB should provide a way to flush journalled data back to the DB.