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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2021/08/31 19:39:23 UTC
[GitHub] [beam] riteshghorse opened a new pull request #15430: Triggers
riteshghorse opened a new pull request #15430:
URL: https://github.com/apache/beam/pull/15430
Helper functions for setting up trigger in Go SDK.
------------------------
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Examples testing status on various runners
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[GitHub] [beam] riteshghorse commented on pull request #15430: [BEAM-3304] Helper functions for triggers
Posted by GitBox <gi...@apache.org>.
riteshghorse commented on pull request #15430:
URL: https://github.com/apache/beam/pull/15430#issuecomment-909633084
Now we can have `window.TriggerAlways()` instead of writing `window.Trigger{Kind: AlwaysTrigger}`. Similarly for other triggers. PTAL.
R: @lostluck
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[GitHub] [beam] riteshghorse commented on pull request #15430: [BEAM-3304] Helper functions for triggers
Posted by GitBox <gi...@apache.org>.
riteshghorse commented on pull request #15430:
URL: https://github.com/apache/beam/pull/15430#issuecomment-909552510
Run Go PostCommit
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[GitHub] [beam] lostluck commented on a change in pull request #15430: [BEAM-3304] Helper functions for triggers
Posted by GitBox <gi...@apache.org>.
lostluck commented on a change in pull request #15430:
URL: https://github.com/apache/beam/pull/15430#discussion_r703715963
##########
File path: sdks/go/pkg/beam/core/runtime/graphx/translate.go
##########
@@ -1061,12 +1061,11 @@ func makeTrigger(t window.Trigger) *pipepb.Trigger {
},
}
case window.AfterEndOfWindowTrigger:
- // TODO: change it to take user config triggers for early and late firings
return &pipepb.Trigger{
Trigger: &pipepb.Trigger_AfterEndOfWindow_{
AfterEndOfWindow: &pipepb.Trigger_AfterEndOfWindow{
- EarlyFirings: makeTrigger(window.Trigger{Kind: window.ElementCountTrigger, ElementCount: 1}),
- LateFirings: nil,
+ EarlyFirings: makeTrigger(*t.EarlyTrigger),
+ LateFirings: makeTrigger(*t.LateTrigger),
Review comment:
Consider constructing these just before, if the fields aren't nil and then assigning the variables to the proto. Right now it's at risk of nil pointer dereferences as EarlyTrigger or LateTrigger could be nil.
After all, according to the proto, both early and late firing clauses are optional.
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[GitHub] [beam] lostluck commented on a change in pull request #15430: [BEAM-3304] Helper functions for triggers
Posted by GitBox <gi...@apache.org>.
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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[GitHub] [beam] lostluck merged pull request #15430: [BEAM-3304] Helper functions for triggers
Posted by GitBox <gi...@apache.org>.
lostluck merged pull request #15430:
URL: https://github.com/apache/beam/pull/15430
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[GitHub] [beam] riteshghorse commented on a change in pull request #15430: [BEAM-3304] Helper functions for triggers
Posted by GitBox <gi...@apache.org>.
riteshghorse commented on a change in pull request #15430:
URL: https://github.com/apache/beam/pull/15430#discussion_r704467079
##########
File path: sdks/go/pkg/beam/core/runtime/graphx/translate.go
##########
@@ -1061,12 +1061,11 @@ func makeTrigger(t window.Trigger) *pipepb.Trigger {
},
}
case window.AfterEndOfWindowTrigger:
- // TODO: change it to take user config triggers for early and late firings
return &pipepb.Trigger{
Trigger: &pipepb.Trigger_AfterEndOfWindow_{
AfterEndOfWindow: &pipepb.Trigger_AfterEndOfWindow{
- EarlyFirings: makeTrigger(window.Trigger{Kind: window.ElementCountTrigger, ElementCount: 1}),
- LateFirings: nil,
+ EarlyFirings: makeTrigger(*t.EarlyTrigger),
+ LateFirings: makeTrigger(*t.LateTrigger),
Review comment:
Yes, thanks. I am initializing the EarlyTrigger with Default trigger. So I would have to check not nil for LateTrigger. Got it.
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[GitHub] [beam] riteshghorse commented on a change in pull request #15430: [BEAM-3304] Helper functions for triggers
Posted by GitBox <gi...@apache.org>.
riteshghorse commented on a change in pull request #15430:
URL: https://github.com/apache/beam/pull/15430#discussion_r700379772
##########
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:
To keep it consistent with other trigger tests. The expected output will still be the same as before because the firing is done only once at the end of window.
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[GitHub] [beam] riteshghorse commented on pull request #15430: [BEAM-3304] Helper functions for triggers
Posted by GitBox <gi...@apache.org>.
riteshghorse commented on pull request #15430:
URL: https://github.com/apache/beam/pull/15430#issuecomment-915297006
Run Go PostCommit
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[GitHub] [beam] riteshghorse commented on a change in pull request #15430: [BEAM-3304] Helper functions for triggers
Posted by GitBox <gi...@apache.org>.
riteshghorse commented on a change in pull request #15430:
URL: https://github.com/apache/beam/pull/15430#discussion_r700384969
##########
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:
Yes it fires once. I haven't tested this for late data as I wasn't able to advance processing time on flink runner.
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[GitHub] [beam] lostluck commented on a change in pull request #15430: [BEAM-3304] Helper functions for triggers
Posted by GitBox <gi...@apache.org>.
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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[GitHub] [beam] lostluck commented on a change in pull request #15430: [BEAM-3304] Helper functions for triggers
Posted by GitBox <gi...@apache.org>.
lostluck commented on a change in pull request #15430:
URL: https://github.com/apache/beam/pull/15430#discussion_r700596951
##########
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:
Please update the comments with the missing information. In this case that late data is discarded.
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[GitHub] [beam] riteshghorse commented on pull request #15430: [BEAM-3304] Helper functions for triggers
Posted by GitBox <gi...@apache.org>.
riteshghorse commented on pull request #15430:
URL: https://github.com/apache/beam/pull/15430#issuecomment-909552510
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[GitHub] [beam] riteshghorse commented on pull request #15430: [BEAM-3304] Helper functions for triggers
Posted by GitBox <gi...@apache.org>.
riteshghorse commented on pull request #15430:
URL: https://github.com/apache/beam/pull/15430#issuecomment-911776054
Made the changes. Added fully configurable AfterEndOfWindow trigger.
PTAL.
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[GitHub] [beam] riteshghorse commented on a change in pull request #15430: [BEAM-3304] Helper functions for triggers
Posted by GitBox <gi...@apache.org>.
riteshghorse commented on a change in pull request #15430:
URL: https://github.com/apache/beam/pull/15430#discussion_r700386199
##########
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:
Okay. Same thing for late data as of default trigger.
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[GitHub] [beam] riteshghorse commented on pull request #15430: [BEAM-3304] Helper functions for triggers
Posted by GitBox <gi...@apache.org>.
riteshghorse commented on pull request #15430:
URL: https://github.com/apache/beam/pull/15430#issuecomment-915474232
Made the changes. PTAL.
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[GitHub] [beam] riteshghorse commented on a change in pull request #15430: [BEAM-3304] Helper functions for triggers
Posted by GitBox <gi...@apache.org>.
riteshghorse commented on a change in pull request #15430:
URL: https://github.com/apache/beam/pull/15430#discussion_r700383424
##########
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:
Okay, got it.
It can have early firings but we have to define that explicitly in graphx/translate.go. But when we'll have parameters, we can use any trigger set by the user.
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