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https://issues.apache.org/jira/browse/FLINK-5701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15857767#comment-15857767
]
ASF GitHub Bot commented on FLINK-5701:
---------------------------------------
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/3278#discussion_r100029980
--- Diff:
flink-connectors/flink-connector-kafka-base/src/test/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducerBaseTest.java
---
@@ -293,6 +293,61 @@ public void run() {
testHarness.close();
}
+ /**
+ * This test is meant to assure that testAtLeastOnceProducer is valid
by testing that if flushing is disabled,
+ * the snapshot method does indeed finishes without waiting for pending
records;
+ * we set a timeout because the test will not finish if the logic is
broken
+ */
+ @Test(timeout=5000)
+ public void testDoesNotWaitForPendingRecordsIfFlushingDisabled() throws
Throwable {
+ final OneShotLatch inputLatch = new OneShotLatch();
+
+ final DummyFlinkKafkaProducer<String> producer = new
DummyFlinkKafkaProducer<>(
+ FakeStandardProducerConfig.get(), null, inputLatch,
100, new AtomicBoolean(false));
+ producer.setFlushOnCheckpoint(false);
+
+ final OneInputStreamOperatorTestHarness<String, Object>
testHarness =
+ new OneInputStreamOperatorTestHarness<>(new
StreamSink(producer));
+
+ testHarness.open();
+
+ List<Callback> pending =
producer.getProducerInstance().getPending();
+
+ for (int i = 0; i < 100; i++) {
+ testHarness.processElement(new StreamRecord<>("msg-" +
i));
+ }
--- End diff --
Why processing `100` elements? Wouldn't `1` be enough?
> FlinkKafkaProducer should check asyncException on checkpoints
> -------------------------------------------------------------
>
> Key: FLINK-5701
> URL: https://issues.apache.org/jira/browse/FLINK-5701
> Project: Flink
> Issue Type: Bug
> Components: Kafka Connector, Streaming Connectors
> Reporter: Tzu-Li (Gordon) Tai
> Priority: Critical
>
> Reported in ML:
> http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Fink-KafkaProducer-Data-Loss-td11413.html
> The problem:
> The producer holds a {{pendingRecords}} value that is incremented on each
> invoke() and decremented on each callback, used to check if the producer
> needs to sync on pending callbacks on checkpoints.
> On each checkpoint, we should only consider the checkpoint succeeded iff
> after flushing the {{pendingRecords == 0}} and {{asyncException == null}}
> (currently, we’re only checking {{pendingRecords}}).
> A quick fix for this is to check and rethrow async exceptions in the
> {{snapshotState}} method both before and after flushing and
> {{pendingRecords}} becomes 0.
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