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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-5673) MmapDirectory shouldn't pass along OOM wrapped as IOException
Date Fri, 16 May 2014 11:24:12 GMT
Robert Muir created LUCENE-5673:
-----------------------------------

             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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