FAQ
Hello, everybody!
I have a bunch of records. Each record has key, and two fields A,B - R(k,
A,B)
I want to build two inverted indexes, one per each field. As output I expect
two files
IndexA =(A1- [k1,k2,k3..]),(A2 -[k1,k2,k4...]) ...
IndexB =(B1- [k1,k2,k3..]),(B2-[k1,k2,k4...]) ...

Hadoop mapper allows to write out only one key value pair. Of cause, I can
run it twice, but I don't want to read the same record twice. What is the
best way to handle this situation?

Thank you,
Andrey
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postedJul 29, '10 at 3:11p
activeJul 29, '10 at 5:54p
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