Replay bug in map-reduce. If I run example.js in https://github.com/dominictarr/map-reduce multiple times I get the following inconsistent results. Some times the reduce seems to fire twice for each type. Other times it fires once for one type and twice for another. other times it behaves as expected

output.txt

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Expected Results

MAP a 1 -> odd
MAP c 3 -> odd
MAP d 4 -> even
MAP b 2 -> even
MAP e 5 -> odd
Reduce [ 'even' ] 6
Reduce [ 'odd' ] 9
Reduce [] 15

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anton@NO9LAP002:~/github/map-reduce$ node example.js 
MAP c 3 -> odd
MAP d 4 -> even
MAP b 2 -> even
MAP a 1 -> odd
MAP e 5 -> odd
Reduce [ 'odd' ] 9
Reduce [ 'even' ] 6
Reduce [] 15
Reduce [ 'odd' ] 9
Reduce [] 15

anton@NO9LAP002:~/github/map-reduce$ node example.js 
MAP a 1 -> odd
MAP c 3 -> odd
MAP b 2 -> even
MAP d 4 -> even
MAP e 5 -> odd
Reduce [ 'even' ] 6
Reduce [ 'odd' ] 9
Reduce [] 15
Reduce [ 'even' ] 6
Reduce [ 'odd' ] 9
Reduce [] 15

anton@NO9LAP002:~/github/map-reduce$ node example.js 
MAP a 1 -> odd
MAP c 3 -> odd
MAP d 4 -> even
MAP b 2 -> even
MAP e 5 -> odd
Reduce [ 'even' ] 6
Reduce [ 'odd' ] 9
Reduce [] 15

anton@NO9LAP002:~/github/map-reduce$ node example.js 
MAP a 1 -> odd
MAP b 2 -> even
MAP d 4 -> even
MAP c 3 -> odd
MAP e 5 -> odd
Reduce [ 'even' ] 6
Reduce [ 'odd' ] 9
Reduce [] 15
Reduce [ 'even' ] 6
Reduce [ 'odd' ] 9
Reduce [] 15
Reduce [] 15

anton@NO9LAP002:~/github/map-reduce$ node example.js 
MAP a 1 -> odd
MAP b 2 -> even
MAP c 3 -> odd
MAP d 4 -> even
MAP e 5 -> odd
Reduce [ 'odd' ] 9
Reduce [] 15
Reduce [ 'even' ] 6
Reduce [ 'odd' ] 9
Reduce [] 15

anton@NO9LAP002:~/github/map-reduce$ node example.js 
MAP a 1 -> odd
MAP d 4 -> even
MAP c 3 -> odd
MAP b 2 -> even
MAP e 5 -> odd
Reduce [ 'even' ] 6
Reduce [] 15
Reduce [ 'odd' ] 9
Reduce [ 'even' ] 6
Reduce [] 15

anton@NO9LAP002:~/github/map-reduce$ node example.js 
MAP c 3 -> odd
MAP d 4 -> even
MAP a 1 -> odd
MAP b 2 -> even
MAP e 5 -> odd
Reduce [ 'odd' ] 9
Reduce [ 'even' ] 6
Reduce [] 15
Reduce [ 'odd' ] 9
Reduce [] 15