Depends on the size of the files-- if there are a bunch of tiny ones, it can be worthwhile to have a CombineFileInputFormat, ala
http://yaseminavcular.blogspot.com/2011/03/many-small-input-files.html J On Tue, Feb 12, 2013 at 1:56 PM, Victor Iacoban <[email protected]>wrote: > Thanks Josh, > Is there any performance penalty in unions, assuming that I have several > hundreds of input files? > > > On Tue, Feb 12, 2013 at 4:39 PM, Josh Wills <[email protected]> wrote: > > > Yeah, of course-- that's how stuff like joins work. > > > > PTable<K, V> first = pipeline.read(new TableSource<K, V>(firstFile)); > > PTable<K, V> second = ...; > > PTable<K, V> union = first.union(second); > > > > etc. > > > > > > On Tue, Feb 12, 2013 at 1:36 PM, Victor Iacoban < > [email protected] > > >wrote: > > > > > Is there any support in crunch to use multiple sequence files as > pipeline > > > source? > > > something similar to standard MultipleInputs > > > > > > Thanks, > > > victor > > > > > >
