[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 {