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. >> >> >> >> >> > > >
