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

["Uwe Schindler (JIRA)" <ji...@apache.org>]

     [ 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

Slightly improved patch:
- Preserves the original OOM message text at the beginning of the message
- Followed by FilleChannel.toString()
- Then add more explaining text, including the buffer size that failed to map

> 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, 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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