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From "Simon Willnauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5628) SpecialOperations.getFiniteStrings should not recurse
Date Thu, 24 Apr 2014 07:59:16 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13979419#comment-13979419
] 

Simon Willnauer commented on LUCENE-5628:
-----------------------------------------

I think it's worth doing the optimization here. A couple of comments

 * can we put the exit condition into the while block instead of at the end with a break I
think it can just be while(string.length > 0) 
 * looking at the impl of State I think we can just use an identity hashset or maybe even
an array since the Ids are within known bounds to check the pathStates? You could even just
us a bitset and mark the state ID as visited? Hmm now that I wrote it I see your comment :)
I will leave it here for dicsussion.
 * Somewhat unrelated but I think the State implementation has a problem since it doen't override
equlas but it should since it has an hashcode impl. I wonder if we either should remove the
hashCode or add equals just for consistency?
 * should we rather throw IllegalState than IllegalArgument :D 
 * just for readability it might be good to s/strings/finiteStrings/ I had a hard time to
see when you do things on the string vs. strings
 * is this a leftover ==> // a.getNumberedStates();




> SpecialOperations.getFiniteStrings should not recurse
> -----------------------------------------------------
>
>                 Key: LUCENE-5628
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5628
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 4.9, 5.0
>
>         Attachments: LUCENE-5628.patch
>
>
> Today it consumes one Java stack frame per transition, which when used by AnalyzingSuggester
is per character in each token.  This can lead to stack overflows if you have a long suggestion.



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