zhuzhurk commented on code in PR #21970:
URL: https://github.com/apache/flink/pull/21970#discussion_r1112513443
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flink-runtime/src/main/java/org/apache/flink/runtime/scheduler/DefaultScheduler.java:
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@@ -377,6 +377,10 @@ private void restartTasks(
final Set<ExecutionVertexID> verticesToRestart =
executionVertexVersioner.getUnmodifiedExecutionVertices(executionVertexVersions);
+ if (verticesToRestart.isEmpty()) {
+ return;
Review Comment:
I'm entirely sure but a bit concerned is that Flink may take some important
actions in `CheckpointCoordinator#restoreLatestCheckpointedStateInternal()`
even if `verticesToRestart` if empty, e.g. `invoking
OperatorCoordinator#resetToCheckpoint(...)`. These actions were always taken
previously, while are possible to be skipped after this change(when a global
failover and regional failover happen concurrently).
I haven't had the chance to examine it all over yet. It's appreciated if you
can also help to examine this.
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