[LUCENE-5673] MMapDirectory shouldn't pass along OOM wrapped as IOException

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.8
• Fix Version/s: 4.9, 6.0
• Component/s: core/store
• Lucene Fields: New
• Assignee: Uwe Schindler
• Reporter: Robert Muir
• Created: 15/May/14 10:33
• Updated: 28/Aug/22 14:07
• Resolved: 16/May/14 14:27

Description

The bug here is in java (not MMapDir), but i think we shoudl do something.

Users get confused when they configure their JVM to trigger something on OOM, and then see "OutOfMemoryError: Map Failed": but their trigger doesnt fire.

Thats because in the jdk, when it maps files it catches OutOfMemoryError, asks for a garbage collection, sleeps for 100 milliseconds, then tries to map again. if it fails a second time it wraps the OOM in a generic IOException.

I think we should add a try/catch to our filechannel.map