[JENA-755] jena-jdbc-driver-tdb uses a lot of disk space on MSWindows.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: Jena 2.12.0
• Component/s: Build
• Assignee: Unassigned
• Reporter: Andy Seaborne
• Created: 02/Aug/14 09:18
• Updated: 17/Apr/21 17:07
• Resolved: 17/Apr/21 17:07

Description

http://mail-archives.apache.org/mod_mbox/jena-dev/201408.mbox/%3CCAPTxtVOp3aLTGG1Q4qNqnWcLWwvBRw0CRSozrPt_L687obwN1g%40mail.gmail.com%3E

jena-tdb creates 11.6 GB of test files in "target/tdb-testing/". There are
about 100 TDB databases created with most of them weighing in at 192 MB
each.

jena-jdbc-driver-tdb creates at least 45 GB of test files in %TEMP%
(C:\Users\sallen\AppData\Local\Temp). There are at least 318 databases
(192 MB each). I ran out of disk space at this point (I have a fairly
small SSD in my laptop), and couldn't actually get it to finish.

I would think that this is a combination of two issues:
1. Sparse files are not used in Windows for the TDB databases (leading to
the 192 MB databases)
2. The JVM bug that does not allow unmapping of memory mapped files until
the JVM exits means that the unit test databases cannot be deleted at the
end of each test