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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2627) MMapDirectory chunking is buggy
Date Fri, 27 Aug 2010 19:19:55 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12903549#action_12903549
] 

Robert Muir commented on LUCENE-2627:
-------------------------------------

for this to fail, your file size has to be an exact multiple of the chunk size (default=Integer.MAX_VALUE),
so its not a big deal, but I think we should fix it.

> MMapDirectory chunking is buggy
> -------------------------------
>
>                 Key: LUCENE-2627
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2627
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Store
>            Reporter: Robert Muir
>         Attachments: LUCENE-2627.patch, LUCENE-2627_test.patch
>
>
> MMapDirectory uses chunking with MultiMMapIndexInput.
>  
> Because Java's ByteBuffer uses an int to address the
> values, it's necessary to access a file >
> Integer.MAX_VALUE in size using multiple byte buffers.
> But i noticed from the clover report the entire MultiMMapIndexInput class is completely
untested: no surprise since all tests make tiny indexes.

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