Sorry. $hive_root/docs/xdocs/language_manual/joins.xml
On Tue, Aug 10, 2010 at 5:57 PM, Edward Capriolo <edlinuxg...@gmail.com> wrote: > This page is is already in version control.. > > /home/edward/cassandra-handler/docs/xdocs/language_manual/joins.xml > > Edward > > On Tue, Aug 10, 2010 at 5:15 PM, Carl Steinbach <c...@cloudera.com> wrote: >> Hi Yongqiang, >> Please go ahead and update the wiki page. I will copy it over to version >> control when you are done. >> Thanks. >> Carl >> >> On Tue, Aug 10, 2010 at 2:11 PM, yongqiang he <heyongqiang...@gmail.com> >> wrote: >>> >>> In the Hive Join wiki page, it says >>> "THIS PAGE WAS MOVED TO HIVE XDOCS ! DO NOT EDIT!Join Syntax" >>> >>> Where should i do the update? >>> >>> On Fri, Aug 6, 2010 at 11:46 PM, yongqiang he <heyongqiang...@gmail.com> >>> wrote: >>> > Yeah. The sort merge bucket mapjoin has been finished for sometime, >>> > and seems stable now. I did one skew join but haven't get a chance to >>> > look at another skew join Namit mentioned to me. But definitely should >>> > update the wiki earlier. My bad. >>> > >>> > On Fri, Aug 6, 2010 at 8:32 PM, Jeff Hammerbacher <ham...@cloudera.com> >>> > wrote: >>> >> Yongqiang mentioned he was going to update the wiki with this >>> >> information in >>> >> the thread at http://hadoop.markmail.org/thread/hxd4uwwukuo46lgw. >>> >> >>> >> Yongqiang, have you gotten a chance to complete the sort merge bucket >>> >> map >>> >> join and the other skew join you mention in the above thread? >>> >> >>> >> Thanks, >>> >> Jeff >>> >> >>> >> On Fri, Aug 6, 2010 at 3:43 AM, bharath vissapragada >>> >> <bhara...@students.iiit.ac.in> wrote: >>> >>> >>> >>> Roberto .. >>> >>> >>> >>> You can find these links useful .. >>> >>> >>> >>> >>> >>> >>> >>> http://www.slideshare.net/ragho/hive-icde-2010?src=related_normal&rel=2374551 >>> >>> - Simple joins and optimizations.. >>> >>> >>> >>> >>> >>> http://www.slideshare.net/zshao/hive-user-meeting-march-2010-hive-team >>> >>> - >>> >>> New kind of joins / features of hive .. >>> >>> >>> >>> Thanks >>> >>> >>> >>> Bharath.V >>> >>> 4th year Undergraduate.. >>> >>> IIIT Hyderabad >>> >>> >>> >>> On Fri, Aug 6, 2010 at 12:16 PM, Cappa Roberto >>> >>> <roberto.ca...@guest.telecomitalia.it> wrote: >>> >>>> >>> >>>> Hi, >>> >>>> >>> >>>> I cannot find any documentation about what algorithm performs HIVE to >>> >>>> translate JOIN clauses to Map-Reduce tasks. >>> >>>> >>> >>>> In particular, if I have two tables A and B, each table is written on >>> >>>> a >>> >>>> separate file and each file is splitted on hadoop nodes. When I >>> >>>> perform a >>> >>>> JOIN with A.column = B.column, the framework has to compare full data >>> >>>> from >>> >>>> the first file and full data from the second file. In order to >>> >>>> perform a >>> >>>> full scan of all possibile combinations of values, how can hadoop >>> >>>> perform >>> >>>> it? If each node contains a portion of each file, it seems not >>> >>>> possible to >>> >>>> have a complete comparison. Does one of the two files enterely >>> >>>> replicated on >>> >>>> each node? Or, does HIVE use another kind of strategy/optimization? >>> >>>> >>> >>>> Thanks. >>> >> >>> >> >>> > >> >> >
