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From Steven Wong <>
Subject RE: number of maptasks of hive
Date Mon, 18 Jul 2011 19:23:58 GMT
What input format are you using in Hive? (It should be the one specified by the hive.input.format

-----Original Message-----
From: 牛兆捷 [] 
Sent: Sunday, July 17, 2011 10:26 PM
Subject: number of maptasks of hive

Does hive split input table file according the ways hadoop provides which a
file is splitted by block size? Then the number of map tasks is decided by
the split size.

But I have a table file which  size is 196MB,my hdfs block size is 64MB,but
I only see 3 map tasks in my web interface.What is the reason?

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