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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5152) Lucene FST is not immutable
Date Thu, 15 Aug 2013 22:43:48 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13741604#comment-13741604
] 

ASF subversion and git services commented on LUCENE-5152:
---------------------------------------------------------

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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