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/**
* 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.tez.runtime.api;

import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.classification.InterfaceStability.Evolving;
import org.apache.tez.dag.api.Vertex;

/**
 * Provides various statistics about physical execution activity happening on a
 * logical input in a {@link Vertex}. Inputs can be external inputs or inputs
 * from other vertices.
 */
@Public
@Evolving
public interface InputStatistics {
  
  /**
   * Returns the data size associated with this logical input
   * 
It is the size of the data read from this input by the vertex.
   * @return Data size in bytes
   */
 public long getDataSize();
 
  /**
   * Get the numbers of items processed. These could be key-value pairs, table
   * records etc.
   * 
   * @return Number of items processed
   */
 public long getItemsProcessed();
 
}