diff --git a/streaming/messages/StreamInitMessage.java b/streaming/messages/StreamInitMessage.java
new file mode 100644
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+++ b/streaming/messages/StreamInitMessage.java
@@ -0,0 +1,135 @@
+/*
+ * 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.cassandra.streaming.messages;
+
+import java.io.DataInput;
+import java.io.IOException;
+import java.net.InetAddress;
+import java.nio.ByteBuffer;
+import java.util.UUID;
+
+import org.apache.cassandra.db.TypeSizes;
+import org.apache.cassandra.io.IVersionedSerializer;
+import org.apache.cassandra.io.util.DataOutputBuffer;
+import org.apache.cassandra.io.util.DataOutputPlus;
+import org.apache.cassandra.net.CompactEndpointSerializationHelper;
+import org.apache.cassandra.net.MessagingService;
+import org.apache.cassandra.utils.UUIDSerializer;
+
+/**
+ * StreamInitMessage is first sent from the node where {@link org.apache.cassandra.streaming.StreamSession} is started,
+ * to initiate corresponding {@link org.apache.cassandra.streaming.StreamSession} on the other side.
+ */
+public class StreamInitMessage
+{
+    public static IVersionedSerializer<StreamInitMessage> serializer = new StreamInitMessageSerializer();
+
+    public final InetAddress from;
+    public final int sessionIndex;
+    public final UUID planId;
+    public final String description;
+
+    // true if this init message is to connect for outgoing message on receiving side
+    public final boolean isForOutgoing;
+    public final boolean keepSSTableLevel;
+
+    public StreamInitMessage(InetAddress from, int sessionIndex, UUID planId, String description, boolean isForOutgoing, boolean keepSSTableLevel)
+    {
+        this.from = from;
+        this.sessionIndex = sessionIndex;
+        this.planId = planId;
+        this.description = description;
+        this.isForOutgoing = isForOutgoing;
+        this.keepSSTableLevel = keepSSTableLevel;
+    }
+
+    /**
+     * Create serialized message.
+     *
+     * @param compress true if message is compressed
+     * @param version Streaming protocol version
+     * @return serialized message in ByteBuffer format
+     */
+    public ByteBuffer createMessage(boolean compress, int version)
+    {
+        int header = 0;
+        // set compression bit.
+        if (compress)
+            header |= 4;
+        // set streaming bit
+        header |= 8;
+        // Setting up the version bit
+        header |= (version << 8);
+
+        byte[] bytes;
+        try
+        {
+            int size = (int)StreamInitMessage.serializer.serializedSize(this, version);
+            DataOutputBuffer buffer = new DataOutputBuffer(size);
+            StreamInitMessage.serializer.serialize(this, buffer, version);
+            bytes = buffer.getData();
+        }
+        catch (IOException e)
+        {
+            throw new RuntimeException(e);
+        }
+        assert bytes.length > 0;
+
+        ByteBuffer buffer = ByteBuffer.allocate(4 + 4 + bytes.length);
+        buffer.putInt(MessagingService.PROTOCOL_MAGIC);
+        buffer.putInt(header);
+        buffer.put(bytes);
+        buffer.flip();
+        return buffer;
+    }
+
+    private static class StreamInitMessageSerializer implements IVersionedSerializer<StreamInitMessage>
+    {
+        public void serialize(StreamInitMessage message, DataOutputPlus out, int version) throws IOException
+        {
+            CompactEndpointSerializationHelper.serialize(message.from, out);
+            out.writeInt(message.sessionIndex);
+            UUIDSerializer.serializer.serialize(message.planId, out, MessagingService.current_version);
+            out.writeUTF(message.description);
+            out.writeBoolean(message.isForOutgoing);
+            out.writeBoolean(message.keepSSTableLevel);
+        }
+
+        public StreamInitMessage deserialize(DataInput in, int version) throws IOException
+        {
+            InetAddress from = CompactEndpointSerializationHelper.deserialize(in);
+            int sessionIndex = in.readInt();
+            UUID planId = UUIDSerializer.serializer.deserialize(in, MessagingService.current_version);
+            String description = in.readUTF();
+            boolean sentByInitiator = in.readBoolean();
+            boolean keepSSTableLevel = in.readBoolean();
+            return new StreamInitMessage(from, sessionIndex, planId, description, sentByInitiator, keepSSTableLevel);
+        }
+
+        public long serializedSize(StreamInitMessage message, int version)
+        {
+            long size = CompactEndpointSerializationHelper.serializedSize(message.from);
+            size += TypeSizes.NATIVE.sizeof(message.sessionIndex);
+            size += UUIDSerializer.serializer.serializedSize(message.planId, MessagingService.current_version);
+            size += TypeSizes.NATIVE.sizeof(message.description);
+            size += TypeSizes.NATIVE.sizeof(message.isForOutgoing);
+            size += TypeSizes.NATIVE.sizeof(message.keepSSTableLevel);
+            return size;
+        }
+    }
+}