// 每个worker向chan写入的次数：
// chOutProgress: N
// chOutMap: 1 for each parsed line
// chOutWorker: 1
func (this *Worker) run(chOutProgress chan<- int, chOutMap chan<- mr.KeyValue, chOutWorker chan<- Worker) {
defer T.Un(T.Trace(""))
this.StartAt = time.Now()
var input *stream.Stream
if this.manager.option.filemode {
input = stream.NewStream(stream.PLAIN_FILE, this.filename)
} else {
input = stream.NewStream(stream.EXEC_PIPE, LZOP_CMD, LZOP_OPTION, this.filename)
}
input.Open()
defer input.Close()
this.Printf("%s worker[%d] opened %s, start to Map...\n", this.kind, this.seq, this.BaseFilename())
for {
line, err := input.Reader().ReadString(EOL)
if err != nil {
if err != io.EOF {
log.Fatal(err)
}
break
}
this.RawLines++
if chOutProgress != nil && this.RawLines%PROGRESS_LINES_STEP == 0 {
// report progress
chOutProgress <- PROGRESS_LINES_STEP
}
if !this.self.IsLineValid(line) {
continue
}
this.ValidLines++
// run map for this line
// for pipe stream flush to work, we can't strip EOL
this.self.Map(line, chOutMap)
}
this.EndAt = time.Now()
chOutWorker <- *this
this.Printf("%s worker[%d] %s done, parsed: %d/%d, duration: %v\n", this.kind, this.seq, this.BaseFilename(),
this.ValidLines, this.RawLines, this.Duration())
}
func (this *Worker) initExternalMapper() *stream.Stream {
defer T.Un(T.Trace(""))
mapper := this.manager.option.mapper
if mapper != "" {
stream := stream.NewStream(stream.EXEC_PIPE, mapper)
if err := stream.Open(); err != nil {
this.Fatal(err)
}
this.Printf("external mapper stream opened: %s\n", mapper)
this.mapReader = stream.Reader()
this.mapWriter = stream.Writer()
return stream
}
return nil
}