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From "Daniel,Wu" <hadoop...@163.com>
Subject Fw:why hive has such a high latency?
Date Wed, 10 Aug 2011 08:59:14 GMT


  Anyone know why hive has such a high latency?  scan a table with 16,522,439 rows take more
than 85 seconds. To read these data off disk, we only need about 10 seconds (even not consider
the caching which read data from memory). So where does 75 seconds go to?  will Deserialize
& Serialize  these objects takes a long time?

the sql is
select count(1) from table




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