Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/17902#discussion_r140290617
--- Diff:
common/kvstore/src/main/java/org/apache/spark/kvstore/KVStoreSerializer.java ---
@@ -0,0 +1,86 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.kvstore;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.GZIPOutputStream;
+import static java.nio.charset.StandardCharsets.UTF_8;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+/**
+ * Serializer used to translate between app-defined types and the LevelDB
store.
+ *
+ * <p>
+ * The serializer is based on Jackson, so values are written as JSON. It
also allows "naked strings"
+ * and integers to be written as values directly, which will be written as
UTF-8 strings.
+ * </p>
+ */
+public class KVStoreSerializer {
+
+ /**
+ * Object mapper used to process app-specific types. If an application
requires a specific
+ * configuration of the mapper, it can subclass this serializer and add
custom configuration
+ * to this object.
+ */
+ protected final ObjectMapper mapper;
+
+ public KVStoreSerializer() {
+ this.mapper = new ObjectMapper();
+ }
+
+ public final byte[] serialize(Object o) throws Exception {
+ if (o instanceof String) {
--- End diff --
Classes are handled by Jackson (the "else").
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