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https://issues.apache.org/jira/browse/BEAM-3304?focusedWorklogId=644673&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-644673
]
ASF GitHub Bot logged work on BEAM-3304:
----------------------------------------
Author: ASF GitHub Bot
Created on: 31/Aug/21 22:44
Start Date: 31/Aug/21 22:44
Worklog Time Spent: 10m
Work Description: lostluck commented on a change in pull request #15430:
URL: https://github.com/apache/beam/pull/15430#discussion_r699718391
##########
File path: sdks/go/pkg/beam/core/graph/window/trigger.go
##########
@@ -35,3 +35,38 @@ const (
NeverTrigger string = "Trigger_Never_"
AfterSynchronizedProcessingTimeTrigger string =
"Trigger_AfterSynchronizedProcessingTime_"
)
+
+// TriggerDefault constructs a default trigger that fires after the end of
window.
+// No provision for late arriving data.
Review comment:
Does this mean it discards late data, or is it unspecified? Does that
mean it fires once?
##########
File path: sdks/go/test/integration/primitives/windowinto.go
##########
@@ -121,7 +128,21 @@ func TriggerAlways(s beam.Scope) {
col := teststream.Create(s, con)
windowSize := 10 * time.Second
- validate(s.Scope("Fixed"), window.NewFixedWindows(windowSize), col,
window.Trigger{Kind: window.AlwaysTrigger}, window.Discarding, 1.0, 2.0, 3.0)
+ validateEquals(s.Scope("Fixed"), window.NewFixedWindows(windowSize),
col, window.TriggerAlways(), window.Discarding, 1.0, 2.0, 3.0)
+}
+
+func validateCount(s beam.Scope, wfn *window.Fn, in beam.PCollection, tr
window.Trigger, m window.AccumulationMode, expected int) {
+ var accumulationMode beam.AccumulationMode
+ switch m {
+ case window.Accumulating:
+ accumulationMode = beam.PanesAccumulate()
+ case window.Discarding:
+ accumulationMode = beam.PanesDiscard()
+ }
Review comment:
Same comment here.
##########
File path: sdks/go/test/integration/primitives/windowinto.go
##########
@@ -110,7 +117,7 @@ func TriggerDefault(s beam.Scope) {
col := teststream.Create(s, con)
windowSize := 10 * time.Second
- validate(s.Scope("Fixed"), window.NewFixedWindows(windowSize), col,
window.Trigger{Kind: window.DefaultTrigger}, window.Accumulating, 6.0, 9.0)
+ validateEquals(s.Scope("Fixed"), window.NewFixedWindows(windowSize),
col, window.TriggerDefault(), window.Discarding, 6.0, 9.0)
Review comment:
Why did the accumulation mode change from Accumulating to Discarding
here?
##########
File path: sdks/go/test/integration/primitives/windowinto.go
##########
@@ -93,8 +93,15 @@ func WindowSums_Lifted(s beam.Scope) {
WindowSums(s.Scope("Lifted"), stats.SumPerKey)
}
-func validate(s beam.Scope, wfn *window.Fn, in beam.PCollection, tr
window.Trigger, m window.AccumulationMode, expected ...interface{}) {
- windowed := beam.WindowInto(s, wfn, in, beam.WindowTrigger{Name: tr},
beam.AccumulationMode{Mode: m})
+func validateEquals(s beam.Scope, wfn *window.Fn, in beam.PCollection, tr
window.Trigger, m window.AccumulationMode, expected ...interface{}) {
+ var accumulationMode beam.AccumulationMode
+ switch m {
+ case window.Accumulating:
+ accumulationMode = beam.PanesAccumulate()
+ case window.Discarding:
+ accumulationMode = beam.PanesDiscard()
+ }
Review comment:
Consider instead changing `m` to be `beam.AccumulationMode` and just
passing in the argument as before, rather than delegating to a switch, etc.
##########
File path: sdks/go/pkg/beam/core/graph/window/trigger.go
##########
@@ -35,3 +35,38 @@ const (
NeverTrigger string = "Trigger_Never_"
AfterSynchronizedProcessingTimeTrigger string =
"Trigger_AfterSynchronizedProcessingTime_"
)
+
+// TriggerDefault constructs a default trigger that fires after the end of
window.
+// No provision for late arriving data.
+func TriggerDefault() Trigger {
+ return Trigger{Kind: DefaultTrigger}
+}
+
+// TriggerAlways constructs an always trigger that keeps firing immediately
after an element is processed.
+func TriggerAlways() Trigger {
+ return Trigger{Kind: AlwaysTrigger}
+}
+
+// TriggerAfterCount constructs an element count trigger that fires after
atleast `count` number of elements are processed.
+func TriggerAfterCount(count int32) Trigger {
+ return Trigger{Kind: ElementCountTrigger, ElementCount: count}
+}
+
+// TriggerAfterProcessingTime constructs a after processing time trigger that
fires after 'delay' milliseconds of processing time has passed.
Review comment:
```suggestion
// TriggerAfterProcessingTime constructs an after processing time trigger
that fires after 'delay' milliseconds of processing time have passed.
```
##########
File path: sdks/go/pkg/beam/core/graph/window/trigger.go
##########
@@ -35,3 +35,38 @@ const (
NeverTrigger string = "Trigger_Never_"
AfterSynchronizedProcessingTimeTrigger string =
"Trigger_AfterSynchronizedProcessingTime_"
)
+
+// TriggerDefault constructs a default trigger that fires after the end of
window.
+// No provision for late arriving data.
+func TriggerDefault() Trigger {
+ return Trigger{Kind: DefaultTrigger}
+}
+
+// TriggerAlways constructs an always trigger that keeps firing immediately
after an element is processed.
Review comment:
Consider clarifying that this is equivalent to
`TriggerRepeat(TriggerAfterCount(1))`. Does anything change here WRT late data
or not?
##########
File path: sdks/go/pkg/beam/core/graph/window/trigger.go
##########
@@ -35,3 +35,38 @@ const (
NeverTrigger string = "Trigger_Never_"
AfterSynchronizedProcessingTimeTrigger string =
"Trigger_AfterSynchronizedProcessingTime_"
)
+
+// TriggerDefault constructs a default trigger that fires after the end of
window.
+// No provision for late arriving data.
+func TriggerDefault() Trigger {
+ return Trigger{Kind: DefaultTrigger}
+}
+
+// TriggerAlways constructs an always trigger that keeps firing immediately
after an element is processed.
+func TriggerAlways() Trigger {
+ return Trigger{Kind: AlwaysTrigger}
+}
+
+// TriggerAfterCount constructs an element count trigger that fires after
atleast `count` number of elements are processed.
+func TriggerAfterCount(count int32) Trigger {
+ return Trigger{Kind: ElementCountTrigger, ElementCount: count}
+}
+
+// TriggerAfterProcessingTime constructs a after processing time trigger that
fires after 'delay' milliseconds of processing time has passed.
+func TriggerAfterProcessingTime(delay int64) Trigger {
+ return Trigger{Kind: AfterProcessingTimeTrigger, Delay: delay}
+}
+
+// TriggerRepeat constructs a repeat trigger that fires a trigger repeatedly
once the condition has been met.
+// Ex: window.TriggerRepeat(window.TriggerAfterCount(1)) is same as
window.TriggerAlways().
+func TriggerRepeat(tr Trigger) Trigger {
+ return Trigger{Kind: RepeatTrigger, SubTriggers: []Trigger{tr}}
+}
+
+// TriggerAfterEndOfWindow constructs an end of window trigger that is
configurable for early firing trigger(before the end of window)
+// and late firing trigger(after the end of window).
+// As of now, the values of Early firing is set to TriggerDefault and Late
firing is set to TriggerAlways.
+func TriggerAfterEndOfWindow() Trigger {
+ // TODO(BEAM-3304): modify it to take parameters for early and late
firing trigger
+ return Trigger{Kind: AfterEndOfWindowTrigger}
+}
Review comment:
If we're going to change the parameters we shouldn't be putting this in
yet. Adding parameters is a breaking incompatible change to users. We could
however, have this explicit behavior and call the method:
`TriggerAfterEndOfWindowAlways()`, so that way we can maintain the behavior for
any users, and can later add the more general `TriggerAfterEndOfWindow()`
function that takes parameters.
Separately, the proposed configuration, does it mean that there won't be any
early firings?
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Issue Time Tracking
-------------------
Worklog Id: (was: 644673)
Time Spent: 8h (was: 7h 50m)
> Go triggering support
> ---------------------
>
> Key: BEAM-3304
> URL: https://issues.apache.org/jira/browse/BEAM-3304
> Project: Beam
> Issue Type: Improvement
> Components: sdk-go
> Reporter: Henning Rohde
> Assignee: Ritesh Ghorse
> Priority: P3
> Time Spent: 8h
> Remaining Estimate: 0h
>
> `Add support for triggers.
> [https://beam.apache.org/documentation/programming-guide/#triggers]
> Triggers are special runner side behavior indicating how to handle data WRT
> the watermark and window. Commonly configuring the processing for “late data”
> and similar.
> These are not currently implemented for user use in the Go SDK. Reshuffle
> configures triggers, but it’s not accessible. A correct trigger
> implementation can at least re-implement Reshuffle in a user pipeline, rather
> than handled specially within the framework.
> * Requires extending the window package to be able to configure the various
> triggers.
> * Specifically being able to compose triggers as also permitted by the proto.
> **
> [https://github.com/apache/beam/blob/6e7b1c44bc7275ee047afc059fd610cd3f4e5bee/model/pipeline/src/main/proto/beam_runner_api.proto#L1111]
>
> * Requires updating the graphx package translate.go to marshal (and
> unmarshal?) the triggers to and from Beam PipelineProto Windowing strategies.
> * Requires supporting triggers with the beam.WindowInto transform for user
> pipeline use as well as complete documentation on its use from the user side.
> **
> [https://github.com/apache/beam/blob/6e7b1c44bc7275ee047afc059fd610cd3f4e5bee/sdks/go/pkg/beam/windowing.go]
>
> * Panes need to be decoded, otherwise triggering will cause runtime errors:
> [https://lists.apache.org/thread.html/r94c42d2d116f6464cd6b689543e5e578edf8310bf7c6e48a0958a56c%40%3Cdev.beam.apache.org%3E]
>
> * Handle pane propagation and observation in the exec package, and in user
> dofns.
> ** Panes indicate whether data was on time or not, and similar facets which
> may be relevant for processing.
> ** Might simply extend the existing window interface.
>
> Similar to windowing, many of the same places as
> https://issues.apache.org/jira/browse/BEAM-11100 need to be modified.
> At simplest though, it's mostly a runner side construction, with less concern
> on the exec side, and generally much simpler.
> Appropriate integration tests against portable runners must be implemented:
> [https://github.com/apache/beam/tree/master/sdks/go/test/integration/primitives]
>
> And optionally add support for the configurable triggers to the the Go Direct
> Runner. However, the results must be compared and validated against a
> semantically correct runner like the python portable runner first. At
> minimum, the Go Direct Runner should be made aware of triggers and produce a
> coherent error whenever there's a trigger it can't deal with.
>
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