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From Jason Wee <peich...@gmail.com>
Subject codec mismatch
Date Fri, 14 Feb 2014 08:13:51 GMT
Hello,

This is my first question to lucene mailing list, sorry if the question
sounds funny.

I have been experimenting to store lucene index files on cassandra,
unfortunately the exception got overwhelmed. Below are the stacktrace.

org.apache.lucene.index.CorruptIndexException: codec mismatch: actual
codec=CompoundFileWriterData vs expected codec=Lucene46FieldInfos
(resource: SlicedIndexInput(SlicedIndexInput(_0.fnm in
lucene-cassandra-desc) in lucene-cassandra-desc slice=31:340))
at org.apache.lucene.codecs.CodecUtil.checkHeaderNoMagic(CodecUtil.java:140)
at org.apache.lucene.codecs.CodecUtil.checkHeader(CodecUtil.java:130)
at
org.apache.lucene.codecs.lucene46.Lucene46FieldInfosReader.read(Lucene46FieldInfosReader.java:56)
at
org.apache.lucene.index.SegmentReader.readFieldInfos(SegmentReader.java:214)
at org.apache.lucene.index.SegmentReader.<init>(SegmentReader.java:94)
at
org.apache.lucene.index.StandardDirectoryReader$1.doBody(StandardDirectoryReader.java:62)
at
org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:843)
at
org.apache.lucene.index.StandardDirectoryReader.open(StandardDirectoryReader.java:52)
at org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:66)
at org.apache.lucene.store.Search.<init>(Search.java:41)
at org.apache.lucene.store.Search.main(Search.java:34)

I'm not sure what does it means, can anybody help?

When I check the hex representation of _0.fnm in cassandra, and translated
to ascii. It is something like this:
??l??Lucene46FieldInfos??????path?Q??????????????PerFieldPostingsFormat.format?Lucene41?PerFieldPostingsFormat.suffix?0?modified?Q??????????????PerFieldPostingsFormat.format?Lucene41?PerFieldPostingsFormat.suffix?0?contents????????????????PerFieldPostingsFormat.format?Lucene41?PerFieldPostingsFormat.suffix?0

It looks to me the expected codec is found in the _0.fnm file or am I wrong?

Thank you and please let me know if you need additional information.

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