splitsize is ignored in PigInputFormat

                 Key: PIG-657
                 URL: https://issues.apache.org/jira/browse/PIG-657
             Project: Pig
          Issue Type: Bug
            Reporter: Laukik Chitnis

The way to control the number of mappers in Hadoop has been to specify a 
mapred.min.split.size parameter in the job conf. For eg.  

However, even if this parameter is specified, Pig creates the number of mappers 
depending only on the number of blocks in the file. This is because the 
parameter is not used in the PigInputFormat.

The parameter can actually be extracted from the job conf object. So, one way 
of doing this would be to pass an handle to the job conf object to the 
PigInputFormat or the custom slicer.

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