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From Michael McCandless <luc...@mikemccandless.com>
Subject Re: codec mismatch
Date Fri, 14 Feb 2014 11:14:49 GMT
This means Lucene was attempting to open _0.fnm but somehow got the
contents of _0.cfs instead; seems likely that it's a bug in the
Cassanda Directory implementation?  Somehow it's opening the wrong
file name?

Mike McCandless

http://blog.mikemccandless.com


On Fri, Feb 14, 2014 at 3:13 AM, Jason Wee <peichieh@gmail.com> wrote:
> 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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