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From Robert Muir <rcm...@gmail.com>
Subject Re: How to configure lucene 4.x to read 3.x index files
Date Tue, 23 Sep 2014 11:52:09 GMT
You should not have to configure anything.

The exception should not happen: can I have this index to debug the issue?

On Mon, Sep 22, 2014 at 11:07 PM, Patrick Mi
<patrick.mi@touchpoint.co.nz> wrote:
> Hi there,
>
> I understood that Lucene V4 could read 3.x index files by configuring
> Lucene3xCodec but what exactly needs to be done here?
>
> I used DEMO code from V4.10.0 to generate v4 index files and could read them
> without problem. When I tried to read index files generated from V3 I got
> the following errors:
>
> Exception in thread "main" org.apache.lucene.index.CorruptIndexException:
> did not read all bytes from file: read 65 vs size 66 (resource:
> BufferedChecksumIndexInput(MMapIndexInput(path="C:\indexes\v3\_1os1_5.del")))
>         at org.apache.lucene.codecs.CodecUtil.checkEOF(CodecUtil.java:252)
>         at org.apache.lucene.codecs.lucene40.BitVector.<init>(BitVector.java:363)
>         at
> org.apache.lucene.codecs.lucene40.Lucene40LiveDocsFormat.readLiveDocs(Lucene40LiveDocsFormat.java:91)
>         at org.apache.lucene.index.SegmentReader.<init>(SegmentReader.java:116)
>         at
> org.apache.lucene.index.StandardDirectoryReader$1.doBody(StandardDirectoryReader.java:62)
>         at
> org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:913)
>         at
> org.apache.lucene.index.StandardDirectoryReader.open(StandardDirectoryReader.java:53)
>         at org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:67)
>         at org.apache.lucene.demo.SearchFiles.main(SearchFiles.java:95)
>
> My classpath includes the following jars from V4:
> lucene-core-4.10.0.jar
> lucene-analyzers-common-4.10.0.jar
> lucene-queries-4.10.0.jar
> lucene-queryparser-4.10.0.jar
> lucene-facet-4.10.0.jar
> lucene-expressions-4.10.0.jar
>
> Noticed that META-INF/services/org.apache.lucene.codecs.Codec ( part of
> lucene-core-4.10.0.jar) contains the following lines:
> org.apache.lucene.codecs.lucene40.Lucene40Codec
> org.apache.lucene.codecs.lucene3x.Lucene3xCodec
> org.apache.lucene.codecs.lucene41.Lucene41Codec
> org.apache.lucene.codecs.lucene42.Lucene42Codec
> org.apache.lucene.codecs.lucene45.Lucene45Codec
> org.apache.lucene.codecs.lucene46.Lucene46Codec
> org.apache.lucene.codecs.lucene49.Lucene49Codec
> org.apache.lucene.codecs.lucene410.Lucene410Codec
>
> Does that mean Lucene3xCodec will be picked up automatically based on the
> index files itself?
>
> Where is the API I could force the code to use V3 setting? IndexReader and
> IndexSearcher don’t seem to have anywhere I can pass that in?
>
> Did some search but couldn't find the useful resources covered that. Much
> appreciated if someone could point out the right direction.
>
> Regards,
> Patrick
>
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