GJL commented on a change in pull request #10309: [FLINK-14909][runtime] Let
tasks get scheduled in topological order when possible
URL: https://github.com/apache/flink/pull/10309#discussion_r350180188
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/scheduler/strategy/LazyFromSourcesSchedulingStrategy.java
##########
@@ -100,12 +101,15 @@ public void onExecutionStateChange(ExecutionVertexID
executionVertexId, Executio
return;
}
- final Set<SchedulingExecutionVertex<?, ?>> verticesToSchedule =
IterableUtils
+ final Set<SchedulingExecutionVertex<?, ?>> verticesDeduplicator
= new HashSet<>();
+
+ final List<SchedulingExecutionVertex<?, ?>> verticesToSchedule
= IterableUtils
.toStream(schedulingTopology.getVertexOrThrow(executionVertexId).getProducedResults())
.filter(partition ->
partition.getResultType().isBlocking())
.flatMap(partition ->
inputConstraintChecker.markSchedulingResultPartitionFinished(partition).stream())
.flatMap(partition ->
IterableUtils.toStream(partition.getConsumers()))
- .collect(Collectors.toSet());
+ .filter(verticesDeduplicator::add)
Review comment:
https://docs.oracle.com/javase/8/docs/api/java/util/stream/Stream.html#distinct--
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