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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.
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package org.apache.pig.backend.hadoop.executionengine.mapReduceLayer;
Interface to implement when you want to customize the way of computing the size of output in PigStats. Since not every storage is file-based (e.g. HBaseStorage), the output size cannot always be computed as the total size of output files.

public interface PigStatsOutputSizeReader {
    static final String OUTPUT_SIZE_READER_KEY = "pig.stats.output.size.reader";

    
Returns whether the given PSStore is supported by this output size reader or not.

Parameters:
sto POStore
    public boolean supports(POStore sto);

    
Returns the size of output in bytes. If the size of output cannot be computed for any reason, -1 should be returned.

Parameters:
sto POStore
conf configuration
    public long getOutputSize(POStore stoConfiguration confthrows IOException;
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