Fixing deps & serialization for RTView

- hoodie-hadoop-mr now needs objectsize bundled
 - Also updated docs with additional tuning tips

hoodie-hadoop-mr/pom.xml

@@ -79,6 +79,11 @@
       <groupId>com.twitter</groupId>
       <artifactId>parquet-avro</artifactId>
     </dependency>
+    <dependency>
+      <groupId>com.twitter.common</groupId>
+      <artifactId>objectsize</artifactId>
+      <version>0.0.12</version>
+    </dependency>
     <dependency>
       <groupId>org.apache.avro</groupId>
       <artifactId>avro</artifactId>
@@ -114,6 +119,7 @@
                 <includes>
                   <include>com.uber.hoodie:hoodie-common</include>
                   <include>com.twitter:parquet-avro</include>
+                  <include>com.twitter.common:objectsize</include>
                 </includes>
               </artifactSet>
             </configuration>

hoodie-hadoop-mr/src/main/java/com/uber/hoodie/hadoop/realtime/HoodieRealtimeFileSplit.java

@@ -63,22 +63,22 @@ public class HoodieRealtimeFileSplit extends FileSplit {
   }
 
   private static void writeString(String str, DataOutput out) throws IOException {
-    byte[] pathBytes = str.getBytes(StandardCharsets.UTF_8);
-    out.writeInt(pathBytes.length);
-    out.write(pathBytes);
+    byte[] bytes = str.getBytes(StandardCharsets.UTF_8);
+    out.writeInt(bytes.length);
+    out.write(bytes);
   }
 
   private static String readString(DataInput in) throws IOException {
-    byte[] pathBytes = new byte[in.readInt()];
-    in.readFully(pathBytes);
-    return new String(pathBytes, StandardCharsets.UTF_8);
+    byte[] bytes = new byte[in.readInt()];
+    in.readFully(bytes);
+    return new String(bytes, StandardCharsets.UTF_8);
   }
 
 
   @Override
   public void write(DataOutput out) throws IOException {
     super.write(out);
-
+    writeString(basePath, out);
     writeString(maxCommitTime, out);
     out.writeInt(deltaFilePaths.size());
     for (String logFilePath : deltaFilePaths) {
@@ -89,7 +89,7 @@ public class HoodieRealtimeFileSplit extends FileSplit {
   @Override
   public void readFields(DataInput in) throws IOException {
     super.readFields(in);
-
+    basePath = readString(in);
     maxCommitTime = readString(in);
     int totalLogFiles = in.readInt();
     deltaFilePaths = new ArrayList<>(totalLogFiles);