fix

Author: 10110346

core/src/main/scala/org/apache/spark/serializer/KryoSerializer.scala

@@ -42,7 +42,7 @@ import org.apache.spark.internal.Logging
 import org.apache.spark.network.util.ByteUnit
 import org.apache.spark.scheduler.{CompressedMapStatus, HighlyCompressedMapStatus}
 import org.apache.spark.storage._
-import org.apache.spark.util.{BoundedPriorityQueue, SerializableConfiguration, SerializableJobConf, Utils}
+import org.apache.spark.util.{BoundedPriorityQueue, ByteBufferInputStream, SerializableConfiguration, SerializableJobConf, Utils}
 import org.apache.spark.util.collection.CompactBuffer
 
 /**
@@ -417,7 +417,12 @@ private[spark] class KryoSerializerInstance(
   override def deserialize[T: ClassTag](bytes: ByteBuffer): T = {
     val kryo = borrowKryo()
     try {
-      input.setBuffer(bytes.array(), bytes.arrayOffset() + bytes.position(), bytes.remaining())
+      if (bytes.hasArray) {
+        input.setBuffer(bytes.array(), bytes.arrayOffset() + bytes.position(), bytes.remaining())
+      } else {
+        input.setBuffer(new Array[Byte](4096))
+        input.setInputStream(new ByteBufferInputStream(bytes))
+      }
       kryo.readClassAndObject(input).asInstanceOf[T]
     } finally {
       releaseKryo(kryo)
@@ -429,7 +434,12 @@ private[spark] class KryoSerializerInstance(
     val oldClassLoader = kryo.getClassLoader
     try {
       kryo.setClassLoader(loader)
-      input.setBuffer(bytes.array(), bytes.arrayOffset() + bytes.position(), bytes.remaining())
+      if (bytes.hasArray) {
+        input.setBuffer(bytes.array(), bytes.arrayOffset() + bytes.position(), bytes.remaining())
+      } else {
+        input.setBuffer(new Array[Byte](4096))
+        input.setInputStream(new ByteBufferInputStream(bytes))
+      }
       kryo.readClassAndObject(input).asInstanceOf[T]
     } finally {
       kryo.setClassLoader(oldClassLoader)

core/src/test/scala/org/apache/spark/serializer/KryoSerializerSuite.scala

@@ -18,6 +18,7 @@
 package org.apache.spark.serializer
 
 import java.io.{ByteArrayInputStream, ByteArrayOutputStream, FileInputStream, FileOutputStream}
+import java.nio.ByteBuffer
 import java.util.concurrent.Executors
 
 import scala.collection.JavaConverters._
@@ -551,6 +552,17 @@ class KryoSerializerAutoResetDisabledSuite extends SparkFunSuite with SharedSpar
     deserializationStream.close()
     assert(serInstance.deserialize[Any](helloHello) === ((hello, hello)))
   }
+
+  test("SPARK-25786: ByteBuffer.array -- UnsupportedOperationException") {
+    val serInstance = new KryoSerializer(conf).newInstance().asInstanceOf[KryoSerializerInstance]
+    val obj = "UnsupportedOperationException"
+    val serObj = serInstance.serialize(obj)
+    val byteBuffer = ByteBuffer.allocateDirect(serObj.array().length)
+    byteBuffer.put(serObj.array())
+    byteBuffer.flip()
+    assert(serInstance.deserialize[Any](serObj) === (obj))
+    assert(serInstance.deserialize[Any](byteBuffer) === (obj))
+  }
 }
 
 class ClassLoaderTestingObject