yunfengzhou-hub commented on a change in pull request #17:
URL: https://github.com/apache/flink-ml/pull/17#discussion_r726039828
##########
File path:
flink-ml-iteration/src/main/java/org/apache/flink/ml/iteration/operator/HeadOperator.java
##########
@@ -129,12 +168,89 @@ public void setup(
public void initializeState(StateInitializationContext context) throws
Exception {
super.initializeState(context);
+ parallelismState =
+ context.getOperatorStateStore()
+ .getUnionListState(
+ new ListStateDescriptor<>("parallelism",
IntSerializer.INSTANCE));
+ OperatorStateUtils.getUniqueElement(parallelismState, "parallelism")
+ .ifPresent(
+ oldParallelism ->
+ checkState(
+ oldParallelism
+ == getRuntimeContext()
+
.getNumberOfParallelSubtasks(),
+ "The head operator is recovered with
parallelism changed from "
+ + oldParallelism
+ + " to "
+ + getRuntimeContext()
+
.getNumberOfParallelSubtasks()));
+
+ // Initialize the status and the record processor.
processorContext = new ContextImpl();
- status = HeadOperatorStatus.RUNNING;
- recordProcessor = new
RegularHeadOperatorRecordProcessor(processorContext);
+ statusState =
+ context.getOperatorStateStore()
+ .getListState(new ListStateDescriptor<>("status",
Integer.class));
+ status =
+ HeadOperatorStatus.values()[
+ OperatorStateUtils.getUniqueElement(statusState,
"status").orElse(0)];
+ if (status == HeadOperatorStatus.RUNNING) {
+ recordProcessor = new
RegularHeadOperatorRecordProcessor(processorContext);
+ } else {
+ recordProcessor = new TerminatingHeadOperatorRecordProcessor();
Review comment:
In which case would a `HeadOperator` be terminated when it has not
finished initialization?
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