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https://issues.apache.org/jira/browse/LUCENE-5152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13741604#comment-13741604
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ASF subversion and git services commented on LUCENE-5152:
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Commit 1514520 from [~mikemccand] in branch 'dev/trunk'
[ https://svn.apache.org/r1514520 ]
LUCENE-5152: make assert less costly
> 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,
> 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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