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https://issues.apache.org/jira/browse/LUCENE-4678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13551512#comment-13551512
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Michael McCandless commented on LUCENE-4678:
--------------------------------------------
bq. this doesn't look particularly efficient
I agree ... I have a new patch shortly that fixes this (goes back to writing
directly into the BytesStore instead of buffering first in RAMOutputStream)...
> FST should use paged byte[] instead of single contiguous byte[]
> ---------------------------------------------------------------
>
> Key: LUCENE-4678
> URL: https://issues.apache.org/jira/browse/LUCENE-4678
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/FSTs
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.2, 5.0
>
> Attachments: LUCENE-4678.patch, LUCENE-4678.patch
>
>
> The single byte[] we use today has several limitations, eg it limits us to <
> 2.1 GB FSTs (and suggesters in the wild are getting close to this limit), and
> it causes big RAM spikes during building when a the array has to grow.
> I took basically the same approach as LUCENE-3298, but I want to break out
> this patch separately from changing all int -> long for > 2.1 GB support.
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