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From Carlos González-Cadenas (Commented) (JIRA) <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3298) FST has hard limit max size of 2.1 GB
Date Sat, 03 Dec 2011 15:44:39 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13162161#comment-13162161
] 

Carlos González-Cadenas commented on LUCENE-3298:
-------------------------------------------------

I forgot to tell you numbers about our input. We have 2 billion sentences without infixes
and 6.7 billion sentences with infixes. The 2 billion sentences are 32GB compressed (350GB
uncompressed) and the 6.7 billion are 132 GB compressed (1.4TB uncompressed) 
                
> 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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