hadoop-common-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hive/LanguageManual/Joins" by NamitJain
Date Wed, 31 Mar 2010 21:34:59 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.

The "Hive/LanguageManual/Joins" page has been changed by NamitJain.
http://wiki.apache.org/hadoop/Hive/LanguageManual/Joins?action=diff&rev1=16&rev2=17

--------------------------------------------------

    FROM A a join B b on a.key = b.key
  }}}
  can be done on the mapper only. The mapper for the bucket for A will traverse the corresponding
bucket for B. This is not the default behavior, and the following parameters need to be set:
+ (((
-   '''set hive.input.format=org.apache.hadoop.hive.ql.io.BucketizedHiveInputFormat'''
+   set hive.input.format=org.apache.hadoop.hive.ql.io.BucketizedHiveInputFormat;
-   '''set hive.optimize.bucketmapjoin = true'''
+   set hive.optimize.bucketmapjoin = true;
-   '''set hive.optimize.bucketmapjoin.sortedmerge = true'''
+   set hive.optimize.bucketmapjoin.sortedmerge = true;
+ )))
  

Mime
View raw message