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https://issues.apache.org/jira/browse/FLINK-18748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17167598#comment-17167598
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Congxian Qiu(klion26) commented on FLINK-18748:
-----------------------------------------------
Hi [~roman_khachatryan] thanks for your reply. If
{{pendingCheckpointsSizeSupplier.get() >= maxConcurrentCheckpointAttempts}} ,
then we would not do step 2, but if {{pendingCheckpointSizeSupplier.get() <
maxConcurrentCheckpointAttempts}} we'll skip case 2, just check the min pause
time in case 3. but in this case, I think the savepoint should be triggered.
If we have {{maxConcurrentCheckpointAttempts}} == 1, and now there is no
ongoing checkpoint/savepoint. the user triggers a savepoint, then we will skip
case 2 in the description. in case 3 we just check the min pause time, so we'll
wait some time.
> Savepoint would be queued unexpected if pendingCheckpoints less than
> maxConcurrentCheckpoints
> ---------------------------------------------------------------------------------------------
>
> Key: FLINK-18748
> URL: https://issues.apache.org/jira/browse/FLINK-18748
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing
> Affects Versions: 1.11.0, 1.11.1
> Reporter: Congxian Qiu(klion26)
> Priority: Major
>
> Inspired by a [user-zh
> email|http://apache-flink.147419.n8.nabble.com/flink-1-11-rest-api-saveppoint-td5497.html]
> After FLINK-17342, when triggering a checkpoint/savepoint, we'll check
> whether the request can be triggered in
> {{CheckpointRequestDecider#chooseRequestToExecute}}, the logic is as follow:
> {code:java}
> Preconditions.checkState(Thread.holdsLock(lock));
> // 1.
> if (isTriggering || queuedRequests.isEmpty()) {
> return Optional.empty();
> }
> // 2 too many ongoing checkpoitn/savepoint
> if (pendingCheckpointsSizeSupplier.get() >= maxConcurrentCheckpointAttempts) {
> return Optional.of(queuedRequests.first())
> .filter(CheckpointTriggerRequest::isForce)
> .map(unused -> queuedRequests.pollFirst());
> }
> // 3 check the timestamp of last complete checkpoint
> long nextTriggerDelayMillis = nextTriggerDelayMillis(lastCompletionMs);
> if (nextTriggerDelayMillis > 0) {
> return onTooEarly(nextTriggerDelayMillis);
> }
> return Optional.of(queuedRequests.pollFirst());
> {code}
> But if currently {{pendingCheckpointsSizeSupplier.get()}} <
> {{maxConcurrentCheckpointAttempts}}, and the request is a savepoint, the
> savepoint will still wait some time in step 3.
> I think we should trigger the savepoint immediately if
> {{pendingCheckpointSizeSupplier.get()}} < {{maxConcurrentCheckpointAttempts}}.
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