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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5673) MmapDirectory shouldn't pass along OOM wrapped as IOException
Date Fri, 16 May 2014 11:20:48 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13999744#comment-13999744
] 

Robert Muir commented on LUCENE-5673:
-------------------------------------

ok now we just need the practical advice to the message...

CONSTANTS.32BIT: "get a new computer"
CONSTANTS.WINDOWS: "get a new operating system"
CONSTANTS.LINUX: "please review 'ulimit -v' and 'sysctl vm.max_map_count'"

> 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, 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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