Myasuka commented on a change in pull request #18989:
URL: https://github.com/apache/flink/pull/18989#discussion_r823406204
##########
File path:
flink-state-backends/flink-statebackend-changelog/src/main/java/org/apache/flink/state/changelog/PeriodicMaterializationManager.java
##########
@@ -105,7 +116,7 @@ public void start() {
LOG.info("Task {} starts periodic materialization", subtaskName);
- scheduleNextMaterialization();
+ scheduleNextMaterialization(initialDelay);
Review comment:
Shall we introduce this another method
`scheduleInitialMaterization(initialDelay)` and make all calling of
`scheduleNextMaterialization(0)` to `scheduleNextMaterialization()`? I think
this looks better.
##########
File path:
flink-state-backends/flink-statebackend-changelog/src/main/java/org/apache/flink/state/changelog/PeriodicMaterializationManager.java
##########
@@ -96,6 +102,11 @@
Executors.newSingleThreadScheduledExecutor(
new ExecutorThreadFactory(
"periodic-materialization-scheduler-" +
subtaskName));
+
+ this.initialDelay =
+ // randomize initial delay to avoid thundering herd problem
+ MathUtils.murmurHash(Objects.hash(operatorId, subtaskIndex))
Review comment:
The `operatorId` which comes from `OperatorSubtaskDescriptionText`
already contains the information of `subtaskIndex`, why we still need another
`subtaskIndex` here?
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