Clean-up logs
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                 Key: HIVE-2682
                 URL: https://issues.apache.org/jira/browse/HIVE-2682
             Project: Hive
          Issue Type: Wish
          Components: Logging
            Reporter: Rajat Goel
            Priority: Trivial


Just wanted to cleanup some logs being printed at wrong loglevel -

1. org.apache.hadoop.hive.ql.exec.CommonJoinOperator prints "table 0 has 1000 
rows for join key [...]" as WARNING. Is it really that? 

2. org.apache.hadoop.hive.ql.exec.GroupByOperator prints "Hash Table completed 
flushed" and "Begin Hash Table flush at close: size = 21" as WARNING. It 
shouldn't be.

3. org.apache.hadoop.fs.FileSystem prints "Not initializing standby filesystem 
because the needed configuration parameters fs.default.name{0|1} are missing." 
as WARNING. Doesn't look like a problem since it is happening at very high rate.

4. org.apache.hadoop.hive.ql.stats.jdbc.JDBCStatsPublisher prints "Warning. 
Invalid statistic." which looks fishy.

5. org.apache.hadoop.mapred.Merger prints "totalBytesProcessed: ABC is larger 
than totalBytesExpected: XYZ" as ERROR at high rate...do we actually care about 
this??

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