Yes it can read 3.x index files without extra configuaration. You cannot enforce that, it is automatically.
Unfortunately, Lucene 4.10 has some problems, which will be fixed with a bugfix release soon. Those bugs can lead to index corruption. Maybe try 4.9.1 first. Are you sure the 3.x index is ok? Uwe Am 23. September 2014 05:07:58 MESZ, schrieb Patrick Mi <patrick...@touchpoint.co.nz>: >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 > >--------------------------------------------------------------------- >To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org >For additional commands, e-mail: java-user-h...@lucene.apache.org -- Uwe Schindler H.-H.-Meier-Allee 63, 28213 Bremen http://www.thetaphi.de
