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From "Doron Cohen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-957) Lucene RAM Directory doesn't work for Index Size > 8 GB
Date Thu, 12 Jul 2007 23:07:04 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-957?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Doron Cohen updated LUCENE-957:
-------------------------------

    Attachment: lucene-957.patch

Patch fixing int / long cast issues in RAMInputStream.

All tests pass but non of those actually demonstrates the bug being fixed. I don't currently
have a large enough index to test this.

I will wait for a manual test by Murali (who reported this issue), and for at least one patch
review.

> Lucene RAM Directory doesn't work for Index Size > 8 GB
> -------------------------------------------------------
>
>                 Key: LUCENE-957
>                 URL: https://issues.apache.org/jira/browse/LUCENE-957
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Store
>            Reporter: Doron Cohen
>            Assignee: Doron Cohen
>         Attachments: lucene-957.patch
>
>
> from user list - http://www.gossamer-threads.com/lists/lucene/java-user/50982
> Problem seems to be casting issues in RAMInputStream.
> Line 90:
>       bufferStart = BUFFER_SIZE * currentBufferIndex;
> both rhs are ints while lhs is long.
> so a very large product would first overflow MAX_INT, become negative, and only then
(auto) casted to long, but this is too late. 
> Line 91: 
>      bufferLength = (int) (length - bufferStart);
> both rhs are longs while lhs is int.
> so the (int) cast result may turn negative and the logic that follows would be wrong.

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