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    <p>I accepted JohnnyHK answer as he answered why my code was not working from one version to another; however, I felt I should post what I modified in the code to resolve the issue.</p> <p>Map Function:</p> <pre><code>var map = function() { var key = this.tag; var fields = { tag: this.tag, networth: this.networth, land: this.land, alive: this.alive, gdi: this.gdi, M: 0, F: 0, T: 0, I: 0, C: 0, H: 0, R: 0, D: 0 }; if (this.gov == "M") fields["M"] = 1 else fields["M"] = 0 if (this.gov == "F") fields["F"] = 1 else fields["F"] = 0 if (this.gov == "T") fields["T"] = 1 else fields["T"] = 0 if (this.gov == "I") fields["I"] = 1 else fields["I"] = 0 if (this.gov == "C") fields["C"] = 1 else fields["C"] = 0 if (this.gov == "H") fields["H"] = 1 else fields["H"] = 0 if (this.gov == "R") fields["R"] = 1 else fields["R"] = 0 if (this.gov == "D") fields["D"] = 1 else fields["D"] = 0 emit(key, fields); }; </code></pre> <p>Reduce Function:</p> <pre><code>var reduce = function(k,vals) { reducedVals = { tag: k, networth: 0, land: 0, alive: 0, M: 0, F: 0, T: 0, I: 0, C: 0, H: 0, R: 0, D: 0, gdi: 0}; for (var i = 0; i &lt; vals.length; i++){ reducedVals.networth += vals[i].networth; reducedVals.land += vals[i].land; reducedVals.alive += vals[i].alive; reducedVals.gdi += vals[i].gdi; reducedVals.M += vals[i].M; reducedVals.F += vals[i].F; reducedVals.T += vals[i].T; reducedVals.I += vals[i].I; reducedVals.C += vals[i].C; reducedVals.H += vals[i].H; reducedVals.R += vals[i].R; reducedVals.D += vals[i].D; } return reducedVals; }; </code></pre>
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    1. POmapReduce gives different results in upgraded 2.2.0
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