tags:

views:

27

answers:

0
Q: 

Map-Side Join Algorithm for MapReduce

Hi Everyone,

I am trying to use the Hadoop's Map-side join using CompositeInputFormat but I get an error: "Unmatched ')'". I guess there may be a problem in the format of my input file. I have formatted the input files manually in such a way that keys are in sorted order in both the input files. Is this correct or do I have to pass the input files through Map/Reduce job to partition them?? I understand the conditions for the map-side join but I am not sure if the manual formatting fulfills those conditions?

I am using IdentityMapper and IdentityReducer as the mapper and reducer classes.

Cheers

related questions

In STL maps, is it better to use map::insert than []?
F#: How do I use Map with a Collection (like Regex Matches)?
Which data structure would you use: TreeMap or HashMap? (Java)
Geographical Data Visualization in a Web Application
Does .NET have a Dictionary implementation that is equivalent to Java's ConcurrentHashMap?
rails map.resources with has_many :through doesn't work?
Why does this map statement in Perl not compile?
Does OCaml have general map()/reduce() functions?
delete a specific entry in the map,but the iterator must point to the next element after the deletion.
Why are Maps returned by a JAX-WS call always empty?
Can I serialize map of STL in MFC using CArchive?
Hashtable/dictionary/map lookup with regular expressions
Is there a map() function in ExtJS?
how do you make a heterogeneous boost::map?
Is there a good way to have a Map<String, ?> get and put ignore case?
Random element in a map
gcc3.3 undefined reference to std::_Rb_tree<>::insert_unique
boost::shared_ptr STL container question
Persistence of std::map in C++
What's the point of Perl's map?
Hashtable in C++?
existance map in c++
Does anyone know of a widget for a desktop toolkit(GTK, Qt, WX) for displaying a map of US states?
Iterate Over Map
Why doesn't my Perl map return anything?