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. >> >> >
