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Posted to dev@lucene.apache.org by "Robert Muir (JIRA)" <ji...@apache.org> on 2014/05/16 13:24:12 UTC

[jira] [Created] (LUCENE-5673) MmapDirectory shouldn't pass along OOM wrapped as IOException

Robert Muir created LUCENE-5673:
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             Summary: MmapDirectory shouldn't pass along OOM wrapped as IOException
                 Key: LUCENE-5673
                 URL: https://issues.apache.org/jira/browse/LUCENE-5673
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Robert Muir
         Attachments: LUCENE-5673.patch

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



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