dmvk commented on a change in pull request #18526:
URL: https://github.com/apache/flink/pull/18526#discussion_r793365135
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/scheduler/ExecutionSlotAllocationContext.java
##########
@@ -44,9 +45,9 @@
* Returns prior allocation id for an execution vertex.
*
* @param executionVertexId id of the execution vertex
- * @return prior allocation id for the given execution vertex
+ * @return prior allocation id for the given execution vertex if it exists
*/
- AllocationID getPriorAllocationId(ExecutionVertexID executionVertexId);
+ Optional<AllocationID> getPriorAllocationId(ExecutionVertexID
executionVertexId);
Review comment:
OT: just one thought on naming, I always tried to stick with `find...`
prefix for anything that can return optional, to make it more explicit that you
may not find the result 🤔
But this is not really a common pattern in Flink, so feel free to ignore it.
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/executiongraph/ExecutionVertex.java
##########
@@ -283,15 +284,30 @@ public ArchivedExecution getPriorExecutionAttempt(int
attemptNumber) {
}
}
- public ArchivedExecution getLatestPriorExecution() {
- synchronized (priorExecutions) {
- final int size = priorExecutions.size();
- if (size > 0) {
- return priorExecutions.get(size - 1);
- } else {
- return null;
+ /**
+ * Gets the latest property from a prior execution that is not null.
+ *
+ * @param extractor defining the property to extract
+ * @param <T> type of the property
+ * @return Optional containing the latest property if it exists; otherwise
{@code
+ * Optional.empty()}.
+ */
+ private <T> Optional<T> getLatestPriorProperty(Function<ArchivedExecution,
T> extractor) {
Review comment:
just wondering, body of the this method used to be synchronized, is it
safe to remove that?
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/executiongraph/ExecutionVertex.java
##########
@@ -283,15 +284,30 @@ public ArchivedExecution getPriorExecutionAttempt(int
attemptNumber) {
}
Review comment:
OT: Can we remove the unused `LOG` field from this class?
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