An error opening iterator for alias means that the job that was trying to compute said alias failed.
Please check Hadoop job logs (you can access them via the Hadoop job tracker you). You are looking for failed tasks. The actual error will be in there. There is no known problem with ORDER in Pig. Chances are this is something about your hadoop setup (the data you are reading does not exist, or the temp directory does not exist, or you can't write to it, or something else along those lines). D On Thu, Dec 8, 2011 at 6:29 PM, Gayatri Rao <[email protected]> wrote: > Hi, > > I was trying out a simple example script uisng ORDER and it doesnt seem to > work. Does any one seem to know if there is any error with ORDER? > > raw = LOAD '$input' USING PigStorage() AS (a:int, b:int, c:int); > ordered = ORDER raw by c DESC; > dump ordered; > > This gives an error saying cannot open iterator for alias; Any ideas what > might be wrong? > > Thanks, > Gayatri
