Rajesh Balamohan created HIVE-15943:
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             Summary: LLAP: Consider adding counter to indicate number of times 
LLAP IO reader got disabled
                 Key: HIVE-15943
                 URL: https://issues.apache.org/jira/browse/HIVE-15943
             Project: Hive
          Issue Type: Bug
          Components: llap
            Reporter: Rajesh Balamohan
            Priority: Minor


https://github.com/apache/hive/blob/master/llap-server/src/java/org/apache/hadoop/hive/llap/io/api/impl/LlapRecordReader.java#L174

Sometimes, due to schema evolution checks, LLAP IO reader could be skipped and 
reader falls back to inputformat's recordreader. Currently this information is 
embedded in logs. It would be helpful to surface this in counters which can be 
used for query analysis.



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