Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/7004#discussion_r34581825
--- Diff:
core/src/main/scala/org/apache/spark/serializer/GenericAvroSerializer.scala ---
@@ -0,0 +1,161 @@
+/*
+ * 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.serializer
+
+import java.io.ByteArrayOutputStream
+import java.nio.ByteBuffer
+import java.util.zip.{Inflater, Deflater}
+
+import scala.collection.mutable
+
+import com.esotericsoftware.kryo.{Kryo, Serializer => KSerializer}
+import com.esotericsoftware.kryo.io.{Input => KryoInput, Output =>
KryoOutput}
+import org.apache.avro.generic.{GenericData, GenericRecord}
+import org.apache.avro.io._
+import org.apache.avro.{Schema, SchemaNormalization}
+
+object GenericAvroSerializer {
+ val avroSchemaNamespace = "avro.schema."
+ def avroSchemaKey(fingerprint: Long): String = avroSchemaNamespace +
fingerprint
+}
+
+/**
+ * Custom serializer used for generic Avro records. If the user registers
the schemas
+ * ahead of time, then the schema's fingerprint will be sent with each
message instead of the actual
+ * schema, as to reduce network IO.
+ * Actions like parsing or compressing schemas are computationally
expensive so the serializer
+ * caches all previously seen values as to reduce the amount of work
needed to do.
+ */
+class GenericAvroSerializer(schemas: Map[Long, String]) extends
KSerializer[GenericRecord] {
+
+ /** Used to reduce the amount of effort to compress the schema */
+ private val compressCache = new mutable.HashMap[Schema, Array[Byte]]()
+ private val decompressCache = new mutable.HashMap[ByteBuffer, Schema]()
+
+ /** Reuses the same datum reader/writer since the same schema will be
used many times */
+ private val writerCache = new mutable.HashMap[Schema, DatumWriter[_]]()
+ private val readerCache = new mutable.HashMap[Schema, DatumReader[_]]()
+
+ /** Fingerprinting is very expensive to this alleviates most of the work
*/
+ private val fingerprintCache = new mutable.HashMap[Schema, Long]()
+ private val schemaCache = new mutable.HashMap[Long, Schema]()
+
+ private def getSchema(fingerprint: Long): Option[String] =
schemas.get(fingerprint)
--- End diff --
this method seems kinda pointless, same thing to inline everywhere
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