[HUDI-379] Refactor the codes based on new JavadocStyle code style rule (#1079)

hudi-spark/src/main/java/org/apache/hudi/BaseAvroPayload.java

@@ -28,17 +28,17 @@ import java.io.IOException;
 import java.io.Serializable;
 
 /**
- * Base class for all AVRO record based payloads, that can be ordered based on a field
+ * Base class for all AVRO record based payloads, that can be ordered based on a field.
  */
 public abstract class BaseAvroPayload implements Serializable {
 
   /**
-   * Avro data extracted from the source converted to bytes
+   * Avro data extracted from the source converted to bytes.
    */
   protected final byte[] recordBytes;
 
   /**
-   * For purposes of preCombining
+   * For purposes of preCombining.
    */
   protected final Comparable orderingVal;
 

hudi-spark/src/main/java/org/apache/hudi/DataSourceUtils.java

@@ -49,7 +49,7 @@ import java.util.Map;
 import java.util.stream.Collectors;
 
 /**
- * Utilities used throughout the data source
+ * Utilities used throughout the data source.
  */
 public class DataSourceUtils {
 
@@ -120,7 +120,7 @@ public class DataSourceUtils {
   }
 
   /**
-   * Create a partition value extractor class via reflection, passing in any configs needed
+   * Create a partition value extractor class via reflection, passing in any configs needed.
    */
   public static PartitionValueExtractor createPartitionExtractor(String partitionExtractorClass) {
     try {

hudi-spark/src/main/java/org/apache/hudi/HoodieDataSourceHelpers.java

@@ -31,7 +31,7 @@ import java.util.List;
 import java.util.stream.Collectors;
 
 /**
- * List of helpers to aid, construction of instanttime for read and write operations using datasource
+ * List of helpers to aid, construction of instanttime for read and write operations using datasource.
  */
 public class HoodieDataSourceHelpers {
 
@@ -53,7 +53,7 @@ public class HoodieDataSourceHelpers {
   }
 
   /**
-   * Returns the last successful write operation's instant time
+   * Returns the last successful write operation's instant time.
    */
   public static String latestCommit(FileSystem fs, String basePath) {
     HoodieTimeline timeline = allCompletedCommitsCompactions(fs, basePath);

hudi-spark/src/main/java/org/apache/hudi/KeyGenerator.java

@@ -26,7 +26,7 @@ import org.apache.avro.generic.GenericRecord;
 import java.io.Serializable;
 
 /**
- * Abstract class to extend for plugging in extraction of {@link HoodieKey} from an Avro record
+ * Abstract class to extend for plugging in extraction of {@link HoodieKey} from an Avro record.
  */
 public abstract class KeyGenerator implements Serializable {
 

hudi-spark/src/main/java/org/apache/hudi/NonpartitionedKeyGenerator.java

@@ -25,7 +25,7 @@ import org.apache.hudi.exception.HoodieKeyException;
 import org.apache.avro.generic.GenericRecord;
 
 /**
- * Simple Key generator for unpartitioned Hive Tables
+ * Simple Key generator for unpartitioned Hive Tables.
  */
 public class NonpartitionedKeyGenerator extends SimpleKeyGenerator {
 

hudi-spark/src/test/java/HoodieJavaApp.java

@@ -45,7 +45,7 @@ import java.util.ArrayList;
 import java.util.List;
 
 /**
- * Sample program that writes & reads hoodie datasets via the Spark datasource
+ * Sample program that writes & reads hoodie datasets via the Spark datasource.
  */
 public class HoodieJavaApp {
 
@@ -232,7 +232,7 @@ public class HoodieJavaApp {
   }
 
   /**
-   * Setup configs for syncing to hive
+   * Setup configs for syncing to hive.
    */
   private DataFrameWriter<Row> updateHiveSyncConfig(DataFrameWriter<Row> writer) {
     if (enableHiveSync) {

hudi-spark/src/test/java/HoodieJavaStreamingApp.java

@@ -45,7 +45,7 @@ import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
 
 /**
- * Sample program that writes & reads hoodie datasets via the Spark datasource streaming
+ * Sample program that writes & reads hoodie datasets via the Spark datasource streaming.
  */
 public class HoodieJavaStreamingApp {
 
@@ -165,7 +165,7 @@ public class HoodieJavaStreamingApp {
   }
 
   /**
-   * Adding data to the streaming source and showing results over time
+   * Adding data to the streaming source and showing results over time.
    * 
    * @param spark
    * @param fs
@@ -215,7 +215,7 @@ public class HoodieJavaStreamingApp {
   }
 
   /**
-   * Hoodie spark streaming job
+   * Hoodie spark streaming job.
    * 
    * @param streamingInput
    * @throws Exception
@@ -236,7 +236,7 @@ public class HoodieJavaStreamingApp {
   }
 
   /**
-   * Setup configs for syncing to hive
+   * Setup configs for syncing to hive.
    * 
    * @param writer
    * @return