Cheolsoo Park created TEZ-1344:
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Summary: Combiner counters reported by Tez look wrong
Key: TEZ-1344
URL: https://issues.apache.org/jira/browse/TEZ-1344
Project: Apache Tez
Issue Type: Bug
Reporter: Cheolsoo Park
Priority: Minor
Combiner input/output counters reported by a Tez job seems wrong
{code}
org.apache.hadoop.mapreduce.TaskCounter:
COMBINE_OUTPUT_RECORDS 35,977,263,353
COMBINE_INPUT_RECORDS 1,000,529,333
{code}
As can be seen, combiner output records > input records?!
The same counters from a MR job looks as follows-
{code}
Map-Reduce Framework:
Combine output records 1,000,316,600
Combine input records 35,977,049,632
{code}
Somehow input and output are swapped?
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