Zheng: is there a way to get at the hadoop conf variables from within a query? If so, you could use mapred.task.id to get a unique string.
-Todd On Thu, Feb 25, 2010 at 12:42 AM, Zheng Shao <[email protected]> wrote: > Since Hive runs many mappers/reducers in parallel, there is no way to > generate a globally unique increasing row id. > If you are OK with that, you can easily write a "non-deterministic" > UDF. See rand() (or UDFRand.java) for example. > > Please open a JIRA if you plan to work on that. > > Zheng > > On Wed, Feb 24, 2010 at 6:47 PM, Weiwei Hsieh <[email protected]> > wrote: > > All, > > > > > > > > Could anyone tell me on how to generate a row id for a new record in > Hive? > > > > > > > > Many thanks. > > > > > > > > weiwei > > > > -- > Yours, > Zheng >
