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sequential.go
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/
sequential.go
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package main
import (
"fmt"
"io/fs"
"log"
"mapreduce/plugins"
"os"
"path/filepath"
)
func sequentialMapReduce(path string, plugin string) {
functions := plugins.Plugins[plugin]
intermediatePairs := []*plugins.KeyValue{}
// read input files and pass into map function
err := filepath.Walk(path, func(path string, info fs.FileInfo, err error) error {
if err != nil {
return err
}
if info.Name()[0] != 'i' {
return nil
}
if info.IsDir() {
return nil
}
data, err := os.ReadFile(path)
if err != nil {
return err
}
intermediatePairs = append(intermediatePairs, functions.Map(string(data))...)
return nil
})
if err != nil {
log.Fatal(err)
}
// pass intermediate k/v pairs into reduce function
finalPairs := functions.Reduce(intermediatePairs)
for _, p := range finalPairs {
fmt.Printf("%v: %v\n", p.Key, p.Value)
}
}