zhuzhurk commented on a change in pull request #9902: [FLINK-14363][runtime]
Prevent vertex from being affected by outdated deployment
URL: https://github.com/apache/flink/pull/9902#discussion_r338394397
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/scheduler/DefaultScheduler.java
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@@ -412,13 +412,17 @@ private static Throwable
maybeWrapWithNoResourceAvailableException(final Throwab
};
}
- private void stopDeployment(final DeploymentHandle deploymentHandle) {
- cancelExecutionVertex(deploymentHandle.getExecutionVertexId());
+ private void releaseUnassignedSlotIfPresent(final DeploymentHandle
deploymentHandle) {
// Canceling the vertex normally releases the slot. However, we
might not have assigned
// the slot to the vertex yet.
+ // Only release unassigned slot to guarantee no vertex state
change happens here.
deploymentHandle
.getLogicalSlot()
- .ifPresent(logicalSlot ->
logicalSlot.releaseSlot(null));
+ .ifPresent(logicalSlot -> {
+ if (logicalSlot.getPayload() != null) {
Review comment:
In simple, if a slot completes the slot request normally, it is always
assigned to an execution in `DefaultScheduler#assignResourceOrHandleError`,
unless there is an unexpected error(including assigning failure) which will
shut down the JM JVM.
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