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From "Adrian Hempel (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-1691) An index copied over another index can result in corruption
Date Mon, 15 Jun 2009 07:26:07 GMT
An index copied over another index can result in corruption
-----------------------------------------------------------

                 Key: LUCENE-1691
                 URL: https://issues.apache.org/jira/browse/LUCENE-1691
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Store
            Reporter: Adrian Hempel
            Priority: Minor
             Fix For: 2.4.1


After restoring an older backup of an index over the top of a newer version of the index,
attempts to open the index can result in CorruptIndexExceptions, such as:

{noformat}
Caused by: org.apache.lucene.index.CorruptIndexException: doc counts differ for segment _ed:
fieldsReader shows 1137 but segmentInfo shows 1389
    at org.apache.lucene.index.SegmentReader.initialize(SegmentReader.java:362)
    at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:306)
    at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:228)
    at org.apache.lucene.index.MultiSegmentReader.<init>(MultiSegmentReader.java:55)
    at org.apache.lucene.index.ReadOnlyMultiSegmentReader.<init>(ReadOnlyMultiSegmentReader.java:27)
    at org.apache.lucene.index.DirectoryIndexReader$1.doBody(DirectoryIndexReader.java:102)
    at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:653)
    at org.apache.lucene.index.DirectoryIndexReader.open(DirectoryIndexReader.java:115)
    at org.apache.lucene.index.IndexReader.open(IndexReader.java:316)
    at org.apache.lucene.index.IndexReader.open(IndexReader.java:237)
{noformat}

The apparent cause is the strategy of taking the maximum of the ID in the segments.gen file,
and the IDs of the apparently valid segment files (See lines 523-593 [here|http://svn.apache.org/viewvc/lucene/java/tags/lucene_2_4_1/src/java/org/apache/lucene/index/SegmentInfos.java?annotate=751393]),
and using this as the current generation of the index.  This will include "stale" segments
that existed before the backup was restored.

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