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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.

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.

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