no segments* file found

Question

Hi, I need to access a lucene index ( created by crawling several webpages using Nutch) but it is giving the error shown above :

java.io.FileNotFoundException: no segments* file found in org.apache.lucene.store.FSDirectory@/home/<path>: files:
    at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:516)
    at org.apache.lucene.index.IndexReader.open(IndexReader.java:185)
    at org.apache.lucene.index.IndexReader.open(IndexReader.java:148)
    at DictionaryGenerator.generateDict(DictionaryGenerator.java:24)
    at DictionaryGenerator.main(DictionaryGenerator.java:56)

I googled but the reasons given were not matching the requirements. The fact that files are being shown ( the path) probably means that the directory is not empty.
Thanks

Answer 1

Basically, the error message says that Lucene did not find the proper files in the index directory. I suggest checking the following:

1. Verify the path of the index directory fits what you think it should be.
2. Do the Nutch and Lucene versions used match? This may stem from a version difference.
3. Is there a permissions issue? Can you read the files in the directory?
4. Try looking at the index using Luke. If you cannot, there is probably some corruption in the index.

If all these do not help, Please post the indexing part of the code.