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  1. Lucene - Core
  2. LUCENE-2365

Finding Newest Segment In Empty Index

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    Description

      While extending the index writer, I discovered that its newestSegment method does not check to see if there are any segments before accessing the segment infos vector. Specifically, if you call the IndexWriter#newestSegment method on a brand-new index which is essentially empty, then it throws an java.lang.ArrayIndexOutOfBoundsException exception.

      The proposed fix is to return null if no segments exist, as shown below:

      — lucene/src/java/org/apache/lucene/index/IndexWriter.java (revision 930788)
      +++ lucene/src/java/org/apache/lucene/index/IndexWriter.java (working copy)
      @@ -4587,7 +4587,7 @@

      // utility routines for tests
      SegmentInfo newestSegment()

      { - return segmentInfos.info(segmentInfos.size()-1); + return segmentInfos.size() > 0 ? segmentInfos.info(segmentInfos.size()-1) : null; }

      Attachments

        1. LUCENE-2365.patch
          2 kB
          Karthick Sankarachary

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            mikemccand Michael McCandless
            karthick Karthick Sankarachary
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              Updated:
              Resolved: