DB Corruption - Suggestions for debugging

[Ryan Ruel]

I have an application that utilizes MapDB databases for persistent storage.

The application utilizes multiple database files to provide isolation, and at runtime the appropriate MapDB file is:
1. Opened.
2. Data within HTreeMaps is modified.

3. The DB is closed.

The DB is opened with the following options:
1. transactionEnable

2. closeOnJvmShutdown

3. cleanerHackEnable

The files are opened in memory mapped mode.

Even with transactions enabled, I am occasionally seeing DB corruption. I think this is related to when my process restarts abruptly. Even so, I'd expect to lose transactions in the WAL, but not wind up with a corrupted DB.

I am using version 3.1.0.

Any suggestions of where to debug next? 

/Ryan