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https://issues.apache.org/jira/browse/FLINK-9352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16532533#comment-16532533
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ASF GitHub Bot commented on FLINK-9352:
---------------------------------------
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/6092#discussion_r200065877
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/CheckpointCoordinator.java
---
@@ -1173,9 +1179,10 @@ public void startCheckpointScheduler() {
stopCheckpointScheduler();
periodicScheduling = true;
+ long initialDelay =
schedulerInitialDelayGenerator.nextLong(
+ minPauseBetweenCheckpointsNanos / 1_000_000,
baseInterval);
--- End diff --
Could we replace `schedulerInitialDelayGenerator` with `long initialDelay =
ThreadLocalRandom.current().nextLong(minPauseBetweenCheckpointsNanos /
1_000_000, baseInterval);`? That way we would not have to use `RandomUtils`.
> In Standalone checkpoint recover mode many jobs with same checkpoint interval
> cause IO pressure
> -----------------------------------------------------------------------------------------------
>
> Key: FLINK-9352
> URL: https://issues.apache.org/jira/browse/FLINK-9352
> Project: Flink
> Issue Type: Improvement
> Components: State Backends, Checkpointing
> Affects Versions: 1.5.0, 1.4.2, 1.6.0
> Reporter: vinoyang
> Assignee: vinoyang
> Priority: Major
> Labels: pull-request-available
>
> currently, the periodic checkpoint coordinator startCheckpointScheduler uses
> *baseInterval* as the initialDelay parameter. the *baseInterval* is also the
> checkpoint interval.
> In standalone checkpoint mode, many jobs config the same checkpoint interval.
> When all jobs being recovered (the cluster restart or jobmanager leadership
> switched), all jobs' checkpoint period will tend to accordance. All jobs'
> CheckpointCoordinator would start and trigger in a approximate time point.
> This caused the high IO cost in the same time period in our production
> scenario.
> I suggest let the scheduleAtFixedRate's initial delay parameter as a API
> config which can let user scatter checkpoint in this scenario.
>
> cc [~StephanEwen] [~Zentol]
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