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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