dannycranmer opened a new pull request, #21918:
URL: https://github.com/apache/flink/pull/21918
…sults in memory leak and busy loop
## What is the purpose of the change
Fixes a race condition in DefaultScheduler that results in memory leak and
busy loop.
## Brief change log
- Add a debounce mechanism within `DefaultScheduler` to prevent triggering
multiple global failovers concurrently.
## Verifying this change
- Added unit test
- Verified on Mini Cluster via the following job:
```
StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
env.setParallelism(1);
env.setRestartStrategy(new
RestartStrategies.FailureRateRestartStrategyConfiguration(10000, Time.of(10,
TimeUnit.SECONDS), Time.of(10, TimeUnit.SECONDS)));
KafkaSource<String> source = KafkaSource.<String>builder()
.setProperty("security.protocol", "SASL_SSL")
// SSL configurations
// Configure the path of truststore (CA) provided by the
server
.setProperty("ssl.truststore.location",
"/path/to/kafka.client.truststore.jks")
.setProperty("ssl.truststore.password", "test1234")
// Configure the path of keystore (private key) if client
authentication is required
.setProperty("ssl.keystore.location",
"/path/to/kafka.client.keystore.jks")
.setProperty("ssl.keystore.password", "test1234")
// SASL configurations
// Set SASL mechanism as SCRAM-SHA-256
.setProperty("sasl.mechanism", "SCRAM-SHA-256")
// Set JAAS configurations
.setProperty("sasl.jaas.config",
"org.apache.kafka.common.security.scram.ScramLoginModule required
username=\"username\" password=\"password\";")
.setBootstrapServers("http://localhost:3456";)
.setTopics("input-topic")
.setGroupId("my-group")
.setStartingOffsets(OffsetsInitializer.earliest())
.setValueOnlyDeserializer(new SimpleStringSchema())
.build();
List<SingleOutputStreamOperator<String>> sources =
IntStream.range(0, 32)
.mapToObj(i -> env
.fromSource(source,
WatermarkStrategy.noWatermarks(), "Kafka Source " + i).uid("source-" + i)
.keyBy(s -> s.charAt(0))
.map(s -> s))
.collect(Collectors.toList());
env.fromSource(source, WatermarkStrategy.noWatermarks(), "Kafka
Source").uid("source")
.keyBy(s -> s.charAt(0))
.union(sources.toArray(new SingleOutputStreamOperator[] {}))
.print();
env.execute("test job");
```
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: no
- The serializers: no
- The runtime per-record code paths (performance sensitive): no
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? not applicable
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