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From Ramprakash Ramamoorthy <>
Subject Negotiating string and byteArray in a migrated index
Date Wed, 26 Dec 2012 14:51:34 GMT
Dear all,

          We are moving from Lucene 2.3 to 4.1. For the migration, we use
the IndexUpgrader class in org.apache.lucene.index of lucene 3.6. And then
migrate it to 4.0 using the 4.0 IndexUpgrader. [This is done to  use the
CompressingStoredFieldFormat of 4.1, have pulled code from the trunk for
now, space is critical for us!]

          The problem is, we are writing the new index with field values as
a byte[] in lucene 4.1 and we are achieving a good compression in the index
size. When an indexReader reads across both the old and newer index, it
would be doc.get("fieldName") for older ones and

           One in-gracious solution would be using an if/else, or may be
catch an exception and operate accordingly to normalise the string and
byte[]. So my question is, is there anyway where I can convert strings to
byte[] during migration, so that this handling process would be clean. Or
is resorting to string index in 4.1 would be the only solution?

With Thanks and Regards,
Ramprakash Ramamoorthy,
+91 9626975420.

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