Mapreduce Examples. A B C D E F Breadth First Search.

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Presentation transcript:

Mapreduce Examples

A B C D E F Breadth First Search

First Iteration Map – Emit (A, 0) – Emit (B, getMessage(0))=(B,1) Reduce (find min value for each Node) – Emit(A,0) – Emit(B,1)

Second Iteration Map – A Emit(A,0) Emit(B,1) – B Emit(B,1) Emit(F,2) Reduce – Emit(A,0) – Emit(B,1) – Emit(F,2)

Third Iteration Map – A Emit(A,0) Emit(B,1) – B Emit(B,1) Emit(F,2) – F Emit(F,2) Emit(D,3) Reduce – Emit(A,0) – Emit(B,1) – Emit(F,2) – Emit(D,3)

4th Iteration Map – A Emit(A,0) Emit(B,1) – B Emit(B,1) Emit(F,2) – F Emit(F,2) Emit(D,3) – D Emit(D,3) Emit(C,4) Emit(E,4) Reduce – Emit(A,0) – Emit(B,1) – Emit(F,2) – Emit(D,3) – Emit(C,4) – Emit(E,4)

5th Iteration Map – A Emit(A,0) Emit(B,1) – B Emit(B,1) Emit(F,2) – F Emit(F,2) Emit(D,3) – D Emit(D,3) Emit(C,4) Emit(E,4) – C Emit(B,5) – E Emit(F,5) Emit(A,5) Reduce – Emit(A,0) – Emit(B,1) – Emit(F,2) – Emit(D,3) – Emit(C,4) – Emit(E,4) Sort Emit(A,0) Emit(A,5) Emit(B,1) Emit(B,5) Emit(C,4) Emit(D,3) Emit(E,4) Emit(F,2) Emit(F,5) No changes for additional Iterations, so done

Distinct Values Phase 1 Map Emit(a,1 count 1) Emit(b,1 count 1) Emit(a,2 count 1) Emit(d,2 count 1) Emit(e,2 count 1) Emit(b,1 count 1) Emit(a,3 count 1) Emit(b,3 count 1) Sort Emit(a,1 count 1) Emit(a,2 count 1) Emit(a,3 count 1) Emit(b,1 count 1, count 1) Emit(b,3 count 1) Emit(d,2 count 1) Emit(e,2 count 1) Reduce Emit(a,1) Emit(a,2) Emit(a,3) Emit(b,1) (Removes duplicates) Emit(b,3) Emit(d,2) Emit(e,2) g, f

Distinct Values Phase 2 Phase 2 Input Emit(a,1) Emit(a,2) Emit(a,3) Emit(b,1) Emit(b,3) Emit(d,2) Emit(e,2) Map Emit(a,1) Emit(b,1) Emit(d,1) Emit(e,1) Sort Emit(a,1,1,1) Emit(b,1,1) Emit(d,1) Emit(e,1) Reduce Emit(a,3) Emit(b,2) Emit(d,1) Emit(e,1) g, f

Cross Correlation {a,b,c} {a,b,c,d} {b,d} Map {a,b,c} Emit(a,b, 1) Emit (a,c, 1) Emit (b,c, 1) {a,b,c,d} Emit(a,b, 1) Emit (a,c, 1) Emit (a,d, 1) Emit (b,c, 1) Emit (b,d, 1) Emit (c,d, 1) {b,d} Emit (b,d, 1) Sort Emit(a,b, 1,1) Emit (a,c, 1,1) Emit (b,c, 1,1) Emit (a,d, 1) Emit (b,d, 1,1) Emit (c,d, 1) Reduce Emit(a,b, 2) Emit (a,c, 2) Emit (b,c, 2) Emit (a,d, 1) Emit (b,d, 2) Emit (c,d, 1)