feat: add HBase SDK for serving

caraml-store-serving/build.gradle

@@ -8,7 +8,8 @@ dependencies {
     implementation 'org.apache.commons:commons-lang3:3.10'
     implementation 'org.apache.avro:avro:1.10.2'
     implementation platform('com.google.cloud:libraries-bom:26.43.0')
-    implementation 'com.google.cloud:google-cloud-bigtable:2.40.0'
+    implementation 'com.google.cloud:google-cloud-bigtable:2.39.2'
+    implementation 'com.google.cloud.bigtable:bigtable-hbase-2.x:2.14.3'
     implementation 'commons-codec:commons-codec:1.17.1'
     implementation 'io.lettuce:lettuce-core:6.2.0.RELEASE'
     implementation 'io.netty:netty-transport-native-epoll:4.1.52.Final:linux-x86_64'

caraml-store-serving/src/main/java/dev/caraml/serving/store/bigtable/BaseSchemaRegistry.java

@@ -0,0 +1,65 @@
+package dev.caraml.serving.store.bigtable;
+
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
+import com.google.protobuf.ByteString;
+import java.util.concurrent.ExecutionException;
+import org.apache.avro.generic.GenericDatumReader;
+import org.apache.avro.generic.GenericRecord;
+
+public abstract class BaseSchemaRegistry {
+  protected LoadingCache<SchemaReference, GenericDatumReader<GenericRecord>> cache = null;
+
+  protected static String COLUMN_FAMILY = "metadata";
+  protected static String QUALIFIER = "avro";
+  protected static String KEY_PREFIX = "schema#";
+  public static final int SCHEMA_REFERENCE_LENGTH = 4;
+
+  public static class SchemaReference {
+    private final String tableName;
+    private final ByteString schemaHash;
+
+    public SchemaReference(String tableName, ByteString schemaHash) {
+      this.tableName = tableName;
+      this.schemaHash = schemaHash;
+    }
+
+    public String getTableName() {
+      return tableName;
+    }
+
+    public ByteString getSchemaHash() {
+      return schemaHash;
+    }
+
+    @Override
+    public int hashCode() {
+      int result = tableName.hashCode();
+      result = 31 * result + schemaHash.hashCode();
+      return result;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+      if (this == o) return true;
+      if (o == null || getClass() != o.getClass()) return false;
+
+      SchemaReference that = (SchemaReference) o;
+
+      if (!tableName.equals(that.tableName)) return false;
+      return schemaHash.equals(that.schemaHash);
+    }
+  }
+
+  public GenericDatumReader<GenericRecord> getReader(SchemaReference reference) {
+    GenericDatumReader<GenericRecord> reader;
+    try {
+      reader = this.cache.get(reference);
+    } catch (ExecutionException | CacheLoader.InvalidCacheLoadException e) {
+      throw new RuntimeException(String.format("Unable to find Schema"), e);
+    }
+    return reader;
+  }
+
+  public abstract GenericDatumReader<GenericRecord> loadReader(SchemaReference reference);
+}

caraml-store-serving/src/main/java/dev/caraml/serving/store/bigtable/BigTableOnlineRetriever.java

@@ -161,8 +161,10 @@ private List<Feature> decodeFeatures(
       BinaryDecoder reusedDecoder,
       long timestamp)
       throws IOException {
-    ByteString schemaReferenceBytes = value.substring(0, 4);
-    byte[] featureValueBytes = value.substring(4).toByteArray();
+    ByteString schemaReferenceBytes =
+        value.substring(0, BigTableSchemaRegistry.SCHEMA_REFERENCE_LENGTH);
+    byte[] featureValueBytes =
+        value.substring(BigTableSchemaRegistry.SCHEMA_REFERENCE_LENGTH).toByteArray();
 
     BigTableSchemaRegistry.SchemaReference schemaReference =
         new BigTableSchemaRegistry.SchemaReference(tableName, schemaReferenceBytes);

caraml-store-serving/src/main/java/dev/caraml/serving/store/bigtable/BigTableSchemaRegistry.java

@@ -6,57 +6,14 @@
 import com.google.cloud.bigtable.data.v2.models.RowCell;
 import com.google.common.cache.CacheBuilder;
 import com.google.common.cache.CacheLoader;
-import com.google.common.cache.LoadingCache;
 import com.google.common.collect.Iterables;
 import com.google.protobuf.ByteString;
-import java.util.concurrent.ExecutionException;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericDatumReader;
 import org.apache.avro.generic.GenericRecord;
 
-public class BigTableSchemaRegistry {
+public class BigTableSchemaRegistry extends BaseSchemaRegistry {
   private final BigtableDataClient client;
-  private final LoadingCache<SchemaReference, GenericDatumReader<GenericRecord>> cache;
-
-  private static String COLUMN_FAMILY = "metadata";
-  private static String QUALIFIER = "avro";
-  private static String KEY_PREFIX = "schema#";
-
-  public static class SchemaReference {
-    private final String tableName;
-    private final ByteString schemaHash;
-
-    public SchemaReference(String tableName, ByteString schemaHash) {
-      this.tableName = tableName;
-      this.schemaHash = schemaHash;
-    }
-
-    public String getTableName() {
-      return tableName;
-    }
-
-    public ByteString getSchemaHash() {
-      return schemaHash;
-    }
-
-    @Override
-    public int hashCode() {
-      int result = tableName.hashCode();
-      result = 31 * result + schemaHash.hashCode();
-      return result;
-    }
-
-    @Override
-    public boolean equals(Object o) {
-      if (this == o) return true;
-      if (o == null || getClass() != o.getClass()) return false;
-
-      SchemaReference that = (SchemaReference) o;
-
-      if (!tableName.equals(that.tableName)) return false;
-      return schemaHash.equals(that.schemaHash);
-    }
-  }
 
   public BigTableSchemaRegistry(BigtableDataClient client) {
     this.client = client;
@@ -67,17 +24,8 @@ public BigTableSchemaRegistry(BigtableDataClient client) {
     cache = CacheBuilder.newBuilder().build(schemaCacheLoader);
   }
 
-  public GenericDatumReader<GenericRecord> getReader(SchemaReference reference) {
-    GenericDatumReader<GenericRecord> reader;
-    try {
-      reader = this.cache.get(reference);
-    } catch (ExecutionException | CacheLoader.InvalidCacheLoadException e) {
-      throw new RuntimeException(String.format("Unable to find Schema"), e);
-    }
-    return reader;
-  }
-
-  private GenericDatumReader<GenericRecord> loadReader(SchemaReference reference) {
+  @Override
+  public GenericDatumReader<GenericRecord> loadReader(SchemaReference reference) {
     Row row =
         client.readRow(
             reference.getTableName(),

caraml-store-serving/src/main/java/dev/caraml/serving/store/bigtable/BigTableStoreConfig.java

@@ -2,10 +2,13 @@
 
 import com.google.cloud.bigtable.data.v2.BigtableDataClient;
 import com.google.cloud.bigtable.data.v2.BigtableDataSettings;
+import com.google.cloud.bigtable.hbase.BigtableConfiguration;
+import com.google.cloud.bigtable.hbase.BigtableOptionsFactory;
 import dev.caraml.serving.store.OnlineRetriever;
 import java.io.IOException;
 import lombok.Getter;
 import lombok.Setter;
+import org.apache.hadoop.hbase.client.Connection;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.context.annotation.Bean;
@@ -23,10 +26,22 @@ public class BigTableStoreConfig {
   private String appProfileId;
   private Boolean enableClientSideMetrics;
   private Long timeoutMs;
+  private Boolean isUsingHBaseSDK;
 
   @Bean
   public OnlineRetriever getRetriever() {
     try {
+      // Using HBase SDK
+      if (isUsingHBaseSDK) {
+        org.apache.hadoop.conf.Configuration config =
+            BigtableConfiguration.configure(projectId, instanceId);
+        config.set(BigtableOptionsFactory.APP_PROFILE_ID_KEY, appProfileId);
+
+        Connection connection = BigtableConfiguration.connect(config);
+        return new HBaseOnlineRetriever(connection);
+      }
+
+      // Using BigTable SDK
       BigtableDataSettings.Builder builder =
           BigtableDataSettings.newBuilder()
               .setProjectId(projectId)
@@ -45,6 +60,7 @@ public OnlineRetriever getRetriever() {
       }
       BigtableDataClient client = BigtableDataClient.create(settings);
       return new BigTableOnlineRetriever(client);
+
     } catch (IOException e) {
       throw new RuntimeException(e);
     }