Adrien Grand created LUCENE-9222:
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Summary: Detect upgrades with non-default formats
Key: LUCENE-9222
URL: https://issues.apache.org/jira/browse/LUCENE-9222
Project: Lucene - Core
Issue Type: Wish
Reporter: Adrien Grand
Lucene doesn't give any backward-compatibility guarantees with non-default
formats, but doesn't try to detect such misuse either, and a couple users fell
in this trap over the years, see e.g. SOLR-14254.
What about dynamically creating the version number of the index format based on
the current Lucene version, so that Lucene would fail with an
IndexFormatTooOldException with non-default formats instead of a confusing
CorruptIndexException. The change would consist of doing something like that
for all our non-default index formats:
{code}
diff --git
a/lucene/codecs/src/java/org/apache/lucene/codecs/memory/FSTTermsWriter.java
b/lucene/codecs/src/java/org/apache/lucene/codecs/memory/FSTTermsWriter.java
index fcc0d00a593..18b35760aec 100644
--- a/lucene/codecs/src/java/org/apache/lucene/codecs/memory/FSTTermsWriter.java
+++ b/lucene/codecs/src/java/org/apache/lucene/codecs/memory/FSTTermsWriter.java
@@ -41,6 +41,7 @@ import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.FixedBitSet;
import org.apache.lucene.util.IOUtils;
import org.apache.lucene.util.IntsRefBuilder;
+import org.apache.lucene.util.Version;
import org.apache.lucene.util.fst.FSTCompiler;
import org.apache.lucene.util.fst.FST;
import org.apache.lucene.util.fst.Util;
@@ -123,7 +124,7 @@ import org.apache.lucene.util.fst.Util;
public class FSTTermsWriter extends FieldsConsumer {
static final String TERMS_EXTENSION = "tfp";
static final String TERMS_CODEC_NAME = "FSTTerms";
- public static final int TERMS_VERSION_START = 2;
+ public static final int TERMS_VERSION_START = (Version.LATEST.major << 16) |
(Version.LATEST.minor << 8) | Version.LATEST.bugfix;
public static final int TERMS_VERSION_CURRENT = TERMS_VERSION_START;
final PostingsWriterBase postingsWriter;
{code}
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