[JENA-1224] Limit the number of outstanding write transactions in TDB.

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Jena 3.1.0
• Fix Version/s: Jena 3.1.1
• Component/s: TDB
• Assignee: Andy Seaborne
• Reporter: Andy Seaborne
• Created: 10/Aug/16 18:29
• Updated: 08/Nov/16 10:21
• Resolved: 23/Aug/16 20:17

Description

The TDB journal can grow due to write-back being blocked by a long running reader, or a succession of overlapping short reads, and many updates.

This users@ email may be caused by this effect. This accumulated layers of wrappers consume heap (<300).

At some time, lock out new transactions and wait to flush the journal when it has many layers in it.