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https://issues.apache.org/jira/browse/BEAM-8550?focusedWorklogId=365780&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-365780
]
ASF GitHub Bot logged work on BEAM-8550:
----------------------------------------
Author: ASF GitHub Bot
Created on: 03/Jan/20 10:09
Start Date: 03/Jan/20 10:09
Worklog Time Spent: 10m
Work Description: je-ik commented on pull request #8774: [BEAM-8550]
Requires time sorted input
URL: https://github.com/apache/beam/pull/8774#discussion_r362758124
##########
File path:
runners/core-java/src/main/java/org/apache/beam/runners/core/StatefulDoFnRunner.java
##########
@@ -85,45 +123,83 @@ public void startBundle() {
doFnRunner.startBundle();
}
+ @Override
+ public void finishBundle() {
+ doFnRunner.finishBundle();
+ }
+
@Override
public void processElement(WindowedValue<InputT> input) {
// StatefulDoFnRunner always observes windows, so we need to explode
for (WindowedValue<InputT> value : input.explodeWindows()) {
-
BoundedWindow window = value.getWindows().iterator().next();
-
if (isLate(window)) {
// The element is too late for this window.
- droppedDueToLateness.inc();
- WindowTracing.debug(
- "StatefulDoFnRunner.processElement: Dropping element at {};
window:{} "
- + "since too far behind inputWatermark:{}",
- input.getTimestamp(),
- window,
- cleanupTimer.currentInputWatermarkTime());
+ reportDroppedElement(value, window);
+ } else if (requiresTimeSortedInput) {
+ processElementOrdered(window, value);
} else {
- cleanupTimer.setForWindow(value.getValue(), window);
- doFnRunner.processElement(value);
+ processElementUnordered(window, value);
+ }
+ }
+ }
+
+ private void processElementUnordered(BoundedWindow window,
WindowedValue<InputT> value) {
+ cleanupTimer.setForWindow(value.getValue(), window);
+ doFnRunner.processElement(value);
+ }
+
+ private void processElementOrdered(BoundedWindow window,
WindowedValue<InputT> value) {
+
+ StateInternals stateInternals = stepContext.stateInternals();
+ TimerInternals timerInternals = stepContext.timerInternals();
+
+ if
(!timerInternals.currentInputWatermarkTime().isAfter(value.getTimestamp())) {
+ StateNamespace namespace = StateNamespaces.window(windowCoder, window);
+ BagState<WindowedValue<InputT>> sortBuffer =
stateInternals.state(namespace, sortBufferTag);
+ ValueState<Instant> minStampState = stateInternals.state(namespace,
sortBufferMinStampTag);
+ sortBuffer.add(value);
+ Instant minStamp =
+ MoreObjects.firstNonNull(minStampState.read(),
BoundedWindow.TIMESTAMP_MAX_VALUE);
+ if (value.getTimestamp().isBefore(minStamp)) {
+ minStamp = value.getTimestamp();
+ minStampState.write(minStamp);
+ setupFlushTimerAndWatermarkHold(namespace, minStamp);
}
+ } else {
+ reportDroppedElement(value, window);
Review comment:
I think that this implies that we have to take better care of allowed
lateness here. Elements that are more late than allowed lateness are dropped by
any stateful dofn, this is no new behavior.
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Issue Time Tracking
-------------------
Worklog Id: (was: 365780)
Time Spent: 6.5h (was: 6h 20m)
> @RequiresTimeSortedInput DoFn annotation
> ----------------------------------------
>
> Key: BEAM-8550
> URL: https://issues.apache.org/jira/browse/BEAM-8550
> Project: Beam
> Issue Type: New Feature
> Components: beam-model, sdk-java-core
> Reporter: Jan Lukavský
> Assignee: Jan Lukavský
> Priority: Major
> Time Spent: 6.5h
> Remaining Estimate: 0h
>
> Implement new annotation {{@RequiresTimeSortedInput}} for stateful DoFn as
> described in [design
> document|https://docs.google.com/document/d/1ObLVUFsf1NcG8ZuIZE4aVy2RYKx2FfyMhkZYWPnI9-c/edit?usp=sharing].
> First implementation will assume that:
> - time is defined by timestamp in associated WindowedValue
> - allowed lateness is explicitly zero and all late elements are dropped
> (due to being out of order)
> The above properties are considered temporary and will be resolved by
> subsequent extensions (backwards compatible).
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