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https://issues.apache.org/jira/browse/FLINK-18767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17170037#comment-17170037
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Nico Kruber commented on FLINK-18767:
-------------------------------------
Just to document it here: setting a buffer timeout of -1 means "no output
flusher" and if the buffer isn't filled (like in my case), it won't be flushed.
I meant to use an interval of 0 which flushes always. We also confirmed that
this one is working, so nothing wrong here, except my code.
> Streaming job stuck when disabling operator chaining
> ----------------------------------------------------
>
> Key: FLINK-18767
> URL: https://issues.apache.org/jira/browse/FLINK-18767
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Network
> Affects Versions: 1.9.3, 1.10.1, 1.11.1
> Reporter: Nico Kruber
> Assignee: Zhijiang
> Priority: Critical
>
> The following code is stuck sending data from the source to the map operator.
> Two settings seem to have an influence here: {{env.setBufferTimeout(-1);}}
> and {{env.disableOperatorChaining();}} - if I remove either of these, the job
> works as expected.
> (I pre-populated my Kafka topic with one element to reproduce easily)
> {code}
> StreamExecutionEnvironment env =
> StreamExecutionEnvironment.getExecutionEnvironment();
> // comment either these two and the job works
> env.setBufferTimeout(-1);
> env.disableOperatorChaining();
> Properties properties = new Properties();
> properties.setProperty("bootstrap.servers", "localhost:9092");
> properties.setProperty("group.id", "test");
> FlinkKafkaConsumer<String> consumer = new FlinkKafkaConsumer<>("topic",
> new SimpleStringSchema(), properties);
> consumer.setStartFromEarliest();
> DataStreamSource<String> input = env.addSource(consumer);
> input
> .map((x) -> x)
> .print();
> env.execute();
> {code}
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