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Pig optimization rules
hi all,

I am trying to learn and implement pig optimization rules, Can any one help
me understanding below properities.

The amount of memory allocated to bags is determined by
the default is set to 20% (0.2) of available memory.* Note that this memory
is shared across all large bags used by the application.

*Which memory is this ?? 20% which memory is allocated.*

Which factor to be considered to set number of number of reducers to a
outer join query with replicated.
Will increasing number of reducers in a outer join query improve the
performance ??