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From "Aaron McKee (JIRA)" <>
Subject [jira] Created: (LUCENE-1949) FilterManager uses unsafe keys for its filter cache
Date Tue, 06 Oct 2009 16:27:31 GMT
FilterManager uses unsafe keys for its filter cache

                 Key: LUCENE-1949
             Project: Lucene - Java
          Issue Type: Bug
          Components: Search
    Affects Versions: 2.9
            Reporter: Aaron McKee
            Priority: Minor

re: FilterManager.getFilter(Filter filter)

FilterManager is using the filter's hash code as the key to its filter cache, however hash
codes are intrinsically not guaranteed to be distinct; different filters may hash to the same
value. Although the chance of a conflict is hopefully low, given reasonable implementations
of hashCode, it's certainly not impossible. When a conflict does occur, an unintended filter
may be returned.

I'm unaware to what extent this class is actively being used, but noticed the issue during
a code browse and thought I'd at least mention it. 

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