Add versioning logging (#18618)

Author: gosusnp

airbyte-commons-worker/src/main/java/io/airbyte/workers/internal/VersionedAirbyteMessageBufferedWriterFactory.java

@@ -8,9 +8,13 @@
 import io.airbyte.commons.protocol.AirbyteMessageVersionedMigratorFactory;
 import io.airbyte.commons.version.Version;
 import java.io.BufferedWriter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class VersionedAirbyteMessageBufferedWriterFactory implements AirbyteMessageBufferedWriterFactory {
 
+  private static final Logger LOGGER = LoggerFactory.getLogger(VersionedAirbyteMessageBufferedWriterFactory.class);
+
   private final AirbyteMessageSerDeProvider serDeProvider;
   private final AirbyteMessageVersionedMigratorFactory migratorFactory;
   private final Version protocolVersion;
@@ -25,6 +29,11 @@ public VersionedAirbyteMessageBufferedWriterFactory(final AirbyteMessageSerDePro
 
   @Override
   public AirbyteMessageBufferedWriter createWriter(BufferedWriter bufferedWriter) {
+    final boolean needMigration = !protocolVersion.getMajorVersion().equals(migratorFactory.getMostRecentVersion().getMajorVersion());
+    LOGGER.info(
+        "Writing messages to protocol version {}{}",
+        protocolVersion.serialize(),
+        needMigration ? ", messages will be downgraded from protocol version " + migratorFactory.getMostRecentVersion().serialize() : "");
     return new VersionedAirbyteMessageBufferedWriter<>(
         bufferedWriter,
         serDeProvider.getSerializer(protocolVersion).orElseThrow(),

airbyte-commons-worker/src/main/java/io/airbyte/workers/internal/VersionedAirbyteStreamFactory.java

@@ -92,6 +92,12 @@ public Stream<AirbyteMessage> create(final BufferedReader bufferedReader) {
         initializeForProtocolVersion(fallbackVersion);
       }
     }
+
+    final boolean needMigration = !protocolVersion.getMajorVersion().equals(migratorFactory.getMostRecentVersion().getMajorVersion());
+    logger.info(
+        "Reading messages from protocol version {}{}",
+        protocolVersion.serialize(),
+        needMigration ? ", messages will be upgraded to protocol version " + migratorFactory.getMostRecentVersion().serialize() : "");
     return super.create(bufferedReader);
   }