// Source lists files under a hdfs folder, and process all files
// This is provided more as an example. You can copy the code and customize
// any way you want.
func Source(f *flow.FlowContext, hdfsLocation string, shard int) *flow.Dataset {
locations, err := List(hdfsLocation)
if err != nil {
log.Fatalf("Can not list files under %s:%v", hdfsLocation, err)
}
return f.Slice(locations).Partition(shard).Map(TextFile)
}
// if this should not run, return false
func (tr *TaskRunner) Run(fc *flow.FlowContext) {
if fc.Id != tr.option.ContextId {
return
}
fc.ChannelBufferSize = tr.option.ChannelBufferSize
taskGroups := plan.GroupTasks(fc)
tr.Tasks = taskGroups[tr.option.TaskGroupId].Tasks
tr.FlowContext = fc
if len(tr.Tasks) == 0 {
log.Println("How can the task group has no tasks!")
return
}
// println("taskGroup", tr.Tasks[0].Name(), "starts")
// 4. setup task input and output channels
var wg sync.WaitGroup
tr.connectInputsAndOutputs(&wg)
// 6. starts to run the task locally
for _, task := range tr.Tasks {
// println("run task", task.Name())
wg.Add(1)
go func(task *flow.Task) {
defer wg.Done()
task.RunTask()
}(task)
}
// 7. need to close connected output channels
wg.Wait()
// println("taskGroup", tr.Tasks[0].Name(), "finishes")
}
// if this should not run, return false
func (tr *TaskRunner) Run(fc *flow.FlowContext) {
if fc.Id != tr.option.ContextId {
return
}
fc.ChannelBufferSize = tr.option.ChannelBufferSize
_, taskGroups := plan.GroupTasks(fc)
tr.Tasks = taskGroups[tr.option.TaskGroupId].Tasks
tr.FlowContext = fc
tr.executorStatus.StartTime = time.Now()
go tr.reportLocalExecutorStatus()
// println("taskGroup", tr.Tasks[0].Name(), "starts")
// 4. setup task input and output channels
var wg sync.WaitGroup
tr.connectInputsAndOutputs(&wg)
// 6. starts to run the task locally
for _, task := range tr.Tasks {
// println("run task", task.Name())
wg.Add(1)
go func(task *flow.Task) {
defer wg.Done()
task.RunTask()
}(task)
}
// 7. need to close connected output channels
wg.Wait()
// println("taskGroup", tr.Tasks[0].Name(), "finishes", tr.option.RequestId)
tr.executorStatus.StopTime = time.Now()
tr.reportLocalExecutorStatusOnce()
}