Are you using or aware of Solandra? See:
https://github.com/tjake/Solandra
Solandra has been superceded by a commercial product, DataStax Enterprise
that combines Solr/Lucene and Cassandra. Solr/Lucene indexing of Cassandra
data is supported, but the actual Lucene indexes are stored in the native
file system for greater performance. Solrandra stored the Lucene indexes in
Cassandra, but the performance penalty was too high.
-- Jack Krupansky
-----Original Message-----
From: Jason Wee
Sent: Friday, February 14, 2014 3:13 AM
To: java-user@lucene.apache.org
Subject: codec mismatch
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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