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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-5673) MmapDirectory shouldn't pass along OOM wrapped as IOException
Date Fri, 16 May 2014 11:24:39 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-5673?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uwe Schindler updated LUCENE-5673:
----------------------------------

    Attachment: LUCENE-5673.patch

Here is a patch, hiding the OOM (because it is definitley no real OOM). This patch also takes
care of "other more correct" impls around (like J9). It only triggers by OOM as root cause
of IOE.

> 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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