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https://issues.apache.org/jira/browse/LUCENE-5152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13727993#comment-13727993
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Simon Willnauer commented on LUCENE-5152:
-----------------------------------------
how is getBytesReader related to the root arcs? unless this slows things down
when assertions are not enabled I'd vote for not moving it. This is a very
trappy thing and we should catch any violation IMO very quickly.
> Lucene FST is not immutable
> ---------------------------
>
> Key: LUCENE-5152
> URL: https://issues.apache.org/jira/browse/LUCENE-5152
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/FSTs
> Affects Versions: 4.4
> Reporter: Simon Willnauer
> Priority: Blocker
> Fix For: 5.0, 4.5
>
> Attachments: LUCENE-5152.patch, LUCENE-5152.patch, LUCENE-5152.patch
>
>
> a spinnoff from LUCENE-5120 where the analyzing suggester modified a returned
> output from and FST (BytesRef) which caused sideffects in later execution.
> I added an assertion into the FST that checks if a cached root arc is
> modified and in-fact this happens for instance in our MemoryPostingsFormat
> and I bet we find more places. We need to think about how to make this less
> trappy since it can cause bugs that are super hard to find.
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