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https://issues.apache.org/jira/browse/FLINK-4027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15357113#comment-15357113
]
ASF GitHub Bot commented on FLINK-4027:
---------------------------------------
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2108#discussion_r69136462
--- Diff:
flink-streaming-connectors/flink-connector-kafka-base/src/test/java/org/apache/flink/streaming/connectors/kafka/AtLeastOnceProducerTest.java
---
@@ -107,15 +115,16 @@ public void run() {
threadB.start();
// this should block:
producer.snapshotState(0, 0);
- // once all pending callbacks are confirmed, we can set this
marker to true
- markOne.set(true);
- for(int i = 0; i < 99; i++) {
- producer.invoke("msg-" + i);
+ synchronized (threadA) {
+ threadA.notifyAll(); // just in case, to let the test
fail faster
}
- // wait at most one second
- threadB.join(800L);
- Assert.assertFalse("Thread A reached this point too fast",
threadB.isAlive());
- if(runnableError.f0 != null) {
+
--- End diff --
I would insert here an assertion which checks that the number of
pendingRecords is `0`.
> FlinkKafkaProducer09 sink can lose messages
> -------------------------------------------
>
> Key: FLINK-4027
> URL: https://issues.apache.org/jira/browse/FLINK-4027
> Project: Flink
> Issue Type: Bug
> Components: Kafka Connector
> Affects Versions: 1.0.3
> Reporter: Elias Levy
> Assignee: Robert Metzger
> Priority: Critical
>
> The FlinkKafkaProducer09 sink appears to not offer at-least-once guarantees.
> The producer is publishing messages asynchronously. A callback can record
> publishing errors, which will be raised when detected. But as far as I can
> tell, there is no barrier to wait for async errors from the sink when
> checkpointing or to track the event time of acked messages to inform the
> checkpointing process.
> If a checkpoint occurs while there are pending publish requests, and the
> requests return a failure after the checkpoint occurred, those message will
> be lost as the checkpoint will consider them processed by the sink.
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