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From Thulasi Ram Naidu Peddineni <>
Subject Reg: Map joins in hive
Date Tue, 27 Sep 2011 17:59:03 GMT
Thulasi Ram P

---------- Forwarded message ----------
From: Thulasi Ram Naidu Peddineni <>
Date: Tue, Sep 27, 2011 at 11:21 PM
Subject: Reg: Map joins in hive

 I have a huge table x (~150M records and ~5GB) with one partition
and another table (~200 records and <10KB). I want to join both these
tables and thought MapJoin is perfect optimization for this. However,
my job log says..

Total MapReduce jobs = 2

Mapred Local Task Succeeded . Convert the Join into MapJoin

Launching Job 1 out of 2

Number of reduce tasks is set to 0 since there's no reduce operator

and then it is stuck at this point of time for a long time. Can you
some explain what could be happening here ?

Thulasi Ram P

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