riteshghorse commented on a change in pull request #15657:
URL: https://github.com/apache/beam/pull/15657#discussion_r723505782
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File path: sdks/go/pkg/beam/core/runtime/harness/harness.go
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@@ -273,6 +273,54 @@ func (c *control) getOrCreatePlan(bdID bundleDescriptorID)
(*exec.Plan, error) {
return plan, nil
}
+// Sampler provides methods for implementing state sampling
+// to track execution time metrics.
+type Sampler interface {
+ startSampler()
+ stopSampler()
+ sample()
+}
+
+// StateSampler tracks the state of a bundle.
+type StateSampler struct {
+ done chan (int) // signal to stop sampling
+ e *metrics.ExecutionStateTracker
+ store *metrics.Store
+ pid string // PTransform ID
+}
+
+func newSampler(e *metrics.ExecutionStateTracker, store *metrics.Store, pid
string) StateSampler {
+ return StateSampler{done: make(chan int), e: e, store: store, pid: pid}
+}
+
+func (s StateSampler) startSampler() {
Review comment:
Got it.
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