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From "Dawid Weiss (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3298) FST has hard limit max size of 2.1 GB
Date Mon, 08 Aug 2011 13:08:27 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13080928#comment-13080928
] 

Dawid Weiss commented on LUCENE-3298:
-------------------------------------

This looks good, James. The thing is: a 2GB fst is actually quite huge; until we can realistically
hit such sizes it makes little sense to replace the code to operate on longs instead of ints
and add an intermediate layer between the byte[] that stores fst data. I believe this will
affect performance, even on 64-bit systems and on 32-bit systems performance degradation will
be significant.

This said, your patch can reside in jira and wait until people hit the 2gb barier -- when
this happens, I'm sure it'll be useful.

> FST has hard limit max size of 2.1 GB
> -------------------------------------
>
>                 Key: LUCENE-3298
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3298
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/FSTs
>            Reporter: Michael McCandless
>            Priority: Minor
>         Attachments: LUCENE-3298.patch
>
>
> The FST uses a single contiguous byte[] under the hood, which in java is indexed by int
so we cannot grow this over Integer.MAX_VALUE.  It also internally encodes references to this
array as vInt.
> We could switch this to a paged byte[] and make the far larger.
> But I think this is low priority... I'm not going to work on it any time soon.

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