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From "Bejoy KS" <>
Subject Re: joining user sessions
Date Wed, 13 Jun 2012 16:52:51 GMT

If one of your tables are small enough then you can go in for map side joins, which actually
distributes the smaller table contents into the distributed cache and then perform the join
which is much faster compared to normal reduce side joins.

To enable map side joins, before executing join query set the following property
Bejoy KS

Sent from handheld, please excuse typos.

-----Original Message-----
From: Cam Bazz <>
Date: Wed, 13 Jun 2012 19:46:18 
To: <>
Subject: joining user sessions


for all the log files i have i log the session id and user cookie. now
i need to seperate certain items of certain users, so i need to join
all my data to a global cookike table.

what are some common practices doing this? just put it in a table and
join? or maybe keep them in some sort of in memory cache?

and ideas / recomendations greatly appreciated.

best regards,
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