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The following page has been changed by UtkarshSrivastava:
http://wiki.apache.org/pig/PigExecutionModel

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  === Proposal ===
  
   1. Single-threaded execution.
-  1. No API changes to UDFs in the short term. In the long term, we might 
introduce an aggregation function API that is push-based along the lines of the 
[http://www.postgresql.org/docs/8.2/static/sql-createaggregate.html Postgres 
user-defined aggregation function API.
+  1. No API changes to UDFs in the short term. In the long term, we might 
introduce an aggregation function API that is push-based along the lines of the 
[http://www.postgresql.org/docs/8.2/static/sql-createaggregate.html Postgres 
user-defined aggregation function API].
-  1. Make the model entirely *push-based*. Reasons:
+  1. Make the model entirely '''push-based'''. Reasons:
      1. Accomodates multiple outputs more naturally.
      1. Accomodates possible future change of having special aggregate 
function API to iterate over data only once.
      1. Functions can still pull data; we will push an entire iterator to 
them, instead of pushing tuple by tuple.

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