[jira] [Updated] (LUCENE-2832) on Windows 64-bit, maybe we should default to a better maxBBufSize in MMapDirectory

["David Smiley (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-2832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Smiley updated LUCENE-2832:
---------------------------------

    Fix Version/s:     (was: 4.7)
                   4.8

> on Windows 64-bit, maybe we should default to a better maxBBufSize in MMapDirectory
> -----------------------------------------------------------------------------------
>
>                 Key: LUCENE-2832
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2832
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/store
>            Reporter: Robert Muir
>            Assignee: Robert Muir
>             Fix For: 4.8
>
>         Attachments: LUCENE-2832.patch
>
>
> Currently the default max buffer size for MMapDirectory is 256MB on 32bit and Integer.MAX_VALUE on 64bit:
> {noformat}
> public static final int DEFAULT_MAX_BUFF = Constants.JRE_IS_64BIT ? Integer.MAX_VALUE : (256 * 1024 * 1024);
> {noformat}
> But, in windows on 64-bit, you are practically limited to 8TB. This can cause problems in extreme cases, such as: http://www.lucidimagination.com/search/document/7522ee54c46f9ca4/map_failed_at_getsearcher
> Perhaps it would be good to change this default such that its 256MB on 32Bit *OR* windows, but leave it at Integer.MAX_VALUE
> on other 64-bit and "64-bit" (48-bit) systems.



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