Java StreamExecutionEnvironment.setStateBackend方法代碼示例

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; //導入方法依賴的package包/類
public static void main(String[] args) throws Exception {
	// parse arguments
	ParameterTool params = ParameterTool.fromPropertiesFile(args[0]);

	// create streaming environment
	final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

	// enable event time processing
	env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);

	// enable fault-tolerance
	env.enableCheckpointing(1000);

	// enable restarts
	env.setRestartStrategy(RestartStrategies.fixedDelayRestart(50, 500L));

	env.setStateBackend(new FsStateBackend("file:///home/robert/flink-workdir/flink-streaming-etl/state-backend"));

	// run each operator separately
	env.disableOperatorChaining();

	// get data from Kafka
	Properties kParams = params.getProperties();
	kParams.setProperty("group.id", UUID.randomUUID().toString());
	DataStream<ObjectNode> inputStream = env.addSource(new FlinkKafkaConsumer09<>(params.getRequired("topic"), new JSONDeserializationSchema(), kParams)).name("Kafka 0.9 Source")
		.assignTimestampsAndWatermarks(new BoundedOutOfOrdernessTimestampExtractor<ObjectNode>(Time.minutes(1L)) {
			@Override
			public long extractTimestamp(ObjectNode jsonNodes) {
				return jsonNodes.get("timestamp_ms").asLong();
			}
		}).name("Timestamp extractor");

	// filter out records without lang field
	DataStream<ObjectNode> tweetsWithLang = inputStream.filter(jsonNode -> jsonNode.has("user") && jsonNode.get("user").has("lang")).name("Filter records without 'lang' field");

	// select only lang = "en" tweets
	DataStream<ObjectNode> englishTweets = tweetsWithLang.filter(jsonNode -> jsonNode.get("user").get("lang").asText().equals("en")).name("Select 'lang'=en tweets");

	// write to file system
	RollingSink<ObjectNode> rollingSink = new RollingSink<>(params.get("sinkPath", "/home/robert/flink-workdir/flink-streaming-etl/rolling-sink"));
	rollingSink.setBucketer(new DateTimeBucketer("yyyy-MM-dd-HH-mm")); // do a bucket for each minute
	englishTweets.addSink(rollingSink).name("Rolling FileSystem Sink");

	// build aggregates (count per language) using window (10 seconds tumbling):
	DataStream<Tuple3<Long, String, Long>> languageCounts = tweetsWithLang.keyBy(jsonNode -> jsonNode.get("user").get("lang").asText())
		.timeWindow(Time.seconds(10))
		.apply(new Tuple3<>(0L, "", 0L), new JsonFoldCounter(), new CountEmitter()).name("Count per Langauage (10 seconds tumbling)");

	// write window aggregate to ElasticSearch
	List<InetSocketAddress> transportNodes = ImmutableList.of(new InetSocketAddress(InetAddress.getByName("localhost"), 9300));
	ElasticsearchSink<Tuple3<Long, String, Long>> elasticsearchSink = new ElasticsearchSink<>(params.toMap(), transportNodes, new ESRequest());

	languageCounts.addSink(elasticsearchSink).name("ElasticSearch2 Sink");

	// word-count on the tweet stream
	DataStream<Tuple2<Date, List<Tuple2<String, Long>>>> topWordCount = tweetsWithLang
		// get text from tweets
		.map(tweet -> tweet.get("text").asText()).name("Get text from Tweets")
		// split text into (word, 1) tuples
		.flatMap(new FlatMapFunction<String, Tuple2<String, Long>>() {
			@Override
			public void flatMap(String s, Collector<Tuple2<String, Long>> collector) throws Exception {
				String[] splits = s.split(" ");
				for (String sp : splits) {
					collector.collect(new Tuple2<>(sp, 1L));
				}
			}
		}).name("Tokenize words")
		// group by word
		.keyBy(0)
		// build 1 min windows, compute every 10 seconds --> count word frequency
		.timeWindow(Time.minutes(1L), Time.seconds(10L)).apply(new WordCountingWindow()).name("Count word frequency (1 min, 10 sec sliding window)")
		// build top n every 10 seconds
		.timeWindowAll(Time.seconds(10L)).apply(new TopNWords(10)).name("TopN Window (10s)");

	// write top Ns to Kafka topic
	topWordCount.addSink(new FlinkKafkaProducer09<>(params.getRequired("wc-topic"), new ListSerSchema(), params.getProperties())).name("Write topN to Kafka");

	env.execute("Streaming ETL");

}
 

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; //導入方法依賴的package包/類
public static void main(String[] args) throws Exception {
	StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
	env.setParallelism(1);
	env.enableCheckpointing(1000);
	env.setRestartStrategy(RestartStrategies.fixedDelayRestart(1, 1000));
	env.setStateBackend(new FsStateBackend("file:///" + System.getProperty("java.io.tmpdir") + "/flink/backend"));

	CassandraSink<Tuple2<String, Integer>> sink = CassandraSink.addSink(env.addSource(new MySource()))
		.setQuery("INSERT INTO example.values (id, counter) values (?, ?);")
		.enableWriteAheadLog()
		.setClusterBuilder(new ClusterBuilder() {
			@Override
			public Cluster buildCluster(Cluster.Builder builder) {
				return builder.addContactPoint("127.0.0.1").build();
			}
		})
		.build();

	sink.name("Cassandra Sink").disableChaining().setParallelism(1).uid("hello");

	env.execute();
}
 

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; //導入方法依賴的package包/類
public static void main(String[] args) throws Exception {

        final ParameterTool params = ParameterTool.fromArgs(args);
        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.getConfig().setGlobalJobParameters(params);
        env.setParallelism(2);
        env.enableCheckpointing(5000);
        env.getCheckpointConfig().setCheckpointingMode(CheckpointingMode.EXACTLY_ONCE);
        env.getCheckpointConfig().enableExternalizedCheckpoints(CheckpointConfig.ExternalizedCheckpointCleanup.RETAIN_ON_CANCELLATION);

        env.setStateBackend(new FsStateBackend("file:///Users/zhouzhou/Binary/flink-1.3.2/testcheckpoints/"));
        RawLogGroupListDeserializer deserializer = new RawLogGroupListDeserializer();
        Properties configProps = new Properties();
        configProps.put(ConfigConstants.LOG_ENDPOINT, sEndpoint);
        configProps.put(ConfigConstants.LOG_ACCESSSKEYID, sAccessKeyId);
        configProps.put(ConfigConstants.LOG_ACCESSKEY, sAccessKey);
        configProps.put(ConfigConstants.LOG_PROJECT, sProject);
        configProps.put(ConfigConstants.LOG_LOGSTORE, sLogstore);
        configProps.put(ConfigConstants.LOG_MAX_NUMBER_PER_FETCH, "10");
        configProps.put(ConfigConstants.LOG_CONSUMER_BEGIN_POSITION, Consts.LOG_FROM_CHECKPOINT);
        configProps.put(ConfigConstants.LOG_CONSUMERGROUP, "23_ots_sla_etl_product");
        DataStream<RawLogGroupList> logTestStream = env.addSource(
                new FlinkLogConsumer<RawLogGroupList>(deserializer, configProps)
        );

        logTestStream.writeAsText("/Users/zhouzhou/Binary/flink-1.3.2/data/newb.txt." + System.nanoTime());
        env.execute("flink log connector");
    }
 

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; //導入方法依賴的package包/類
@Override
public void testProgram(StreamExecutionEnvironment env) {
	assertTrue("Broken test setup", (NUM_STRINGS/2) % NUM_KEYS == 0);

	env.setStateBackend(stateBackend);

	DataStream<Integer> stream1 = env.addSource(new IntGeneratingSourceFunction(NUM_STRINGS / 2));
	DataStream<Integer> stream2 = env.addSource(new IntGeneratingSourceFunction(NUM_STRINGS / 2));

	stream1.union(stream2)
			.keyBy(new IdentityKeySelector<Integer>())
			.map(new OnceFailingPartitionedSum(NUM_STRINGS))
			.keyBy(0)
			.addSink(new CounterSink());
}
 

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; //導入方法依賴的package包/類
@Test
public void testSavepointRestoreFromFlink11() throws Exception {

	final int EXPECTED_SUCCESSFUL_CHECKS = 21;

	final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
	env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);
	// we only test memory state backend yet
	env.setStateBackend(new MemoryStateBackend());
	env.enableCheckpointing(500);
	env.setParallelism(4);
	env.setMaxParallelism(4);

	// create source
	env
			.addSource(new RestoringCheckingSource(NUM_SOURCE_ELEMENTS)).setMaxParallelism(1).uid("LegacyCheckpointedSource")
			.flatMap(new RestoringCheckingFlatMap()).startNewChain().uid("LegacyCheckpointedFlatMap")
			.keyBy(0)
			.flatMap(new RestoringCheckingFlatMapWithKeyedState()).startNewChain().uid("LegacyCheckpointedFlatMapWithKeyedState")
			.keyBy(0)
			.flatMap(new KeyedStateCheckingFlatMap()).startNewChain().uid("KeyedStateSettingFlatMap")
			.keyBy(0)
			.transform(
					"custom_operator",
					new TypeHint<Tuple2<Long, Long>>() {}.getTypeInfo(),
					new RestoringCheckingUdfOperator(new RestoringCheckingFlatMapWithKeyedState())).uid("LegacyCheckpointedOperator")
			.addSink(new AccumulatorCountingSink<Tuple2<Long, Long>>(EXPECTED_ELEMENTS_ACCUMULATOR));

	restoreAndExecute(
			env,
			getResourceFilename("stateful-udf-migration-itcase-flink1.1-savepoint"),
			new Tuple2<>(SUCCESSFUL_CHECK_ACCUMULATOR, EXPECTED_SUCCESSFUL_CHECKS));
}
 

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; //導入方法依賴的package包/類
/**
 * This has to be manually executed to create the savepoint on Flink 1.2.
 */
@Test
@Ignore
public void testCreateSavepointOnFlink12() throws Exception {

	final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
	env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);
	env.setStateBackend(new MemoryStateBackend());
	env.enableCheckpointing(500);
	env.setParallelism(4);
	env.setMaxParallelism(4);

	env
			.addSource(new LegacyCheckpointedSource(NUM_SOURCE_ELEMENTS)).setMaxParallelism(1).uid("LegacyCheckpointedSource")
			.flatMap(new LegacyCheckpointedFlatMap()).startNewChain().uid("LegacyCheckpointedFlatMap")
			.keyBy(0)
			.flatMap(new LegacyCheckpointedFlatMapWithKeyedState()).startNewChain().uid("LegacyCheckpointedFlatMapWithKeyedState")
			.keyBy(0)
			.flatMap(new KeyedStateSettingFlatMap()).startNewChain().uid("KeyedStateSettingFlatMap")
			.keyBy(0)
			.transform(
					"custom_operator",
					new TypeHint<Tuple2<Long, Long>>() {}.getTypeInfo(),
					new CheckpointedUdfOperator(new LegacyCheckpointedFlatMapWithKeyedState())).uid("LegacyCheckpointedOperator")
			.keyBy(0)
			.transform(
					"timely_stateful_operator",
					new TypeHint<Tuple2<Long, Long>>() {}.getTypeInfo(),
					new TimelyStatefulOperator()).uid("TimelyStatefulOperator")
			.addSink(new AccumulatorCountingSink<Tuple2<Long, Long>>());

	executeAndSavepoint(
			env,
			"src/test/resources/" + getSavepointPath(),
			new Tuple2<>(AccumulatorCountingSink.NUM_ELEMENTS_ACCUMULATOR, NUM_SOURCE_ELEMENTS));
}
 

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; //導入方法依賴的package包/類
/**
 * This has to be manually executed to create the savepoint on Flink 1.2.
 */
@Test
@Ignore
public void testCreateSavepointOnFlink12WithRocksDB() throws Exception {

	final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
	env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);
	RocksDBStateBackend rocksBackend =
			new RocksDBStateBackend(new MemoryStateBackend());
	env.setStateBackend(rocksBackend);
	env.enableCheckpointing(500);
	env.setParallelism(4);
	env.setMaxParallelism(4);

	env
			.addSource(new LegacyCheckpointedSource(NUM_SOURCE_ELEMENTS)).setMaxParallelism(1).uid("LegacyCheckpointedSource")
			.flatMap(new LegacyCheckpointedFlatMap()).startNewChain().uid("LegacyCheckpointedFlatMap")
			.keyBy(0)
			.flatMap(new LegacyCheckpointedFlatMapWithKeyedState()).startNewChain().uid("LegacyCheckpointedFlatMapWithKeyedState")
			.keyBy(0)
			.flatMap(new KeyedStateSettingFlatMap()).startNewChain().uid("KeyedStateSettingFlatMap")
			.keyBy(0)
			.transform(
					"custom_operator",
					new TypeHint<Tuple2<Long, Long>>() {}.getTypeInfo(),
					new CheckpointedUdfOperator(new LegacyCheckpointedFlatMapWithKeyedState())).uid("LegacyCheckpointedOperator")
			.keyBy(0)
			.transform(
					"timely_stateful_operator",
					new TypeHint<Tuple2<Long, Long>>() {}.getTypeInfo(),
					new TimelyStatefulOperator()).uid("TimelyStatefulOperator")
			.addSink(new AccumulatorCountingSink<Tuple2<Long, Long>>());

	executeAndSavepoint(
			env,
			"src/test/resources/" + getRocksDBSavepointPath(),
			new Tuple2<>(AccumulatorCountingSink.NUM_ELEMENTS_ACCUMULATOR, NUM_SOURCE_ELEMENTS));
}
 

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; //導入方法依賴的package包/類
/**
 * Verify that the user-specified state backend is used even if checkpointing is disabled.
 */
@Test
public void testStateBackendWithoutCheckpointing() throws Exception {

	StreamExecutionEnvironment see = StreamExecutionEnvironment.getExecutionEnvironment();
	see.setParallelism(1);

	see.getConfig().setRestartStrategy(RestartStrategies.noRestart());
	see.setStateBackend(new FailingStateBackend());

	see.fromElements(new Tuple2<>("Hello", 1))
		.keyBy(0)
		.map(new RichMapFunction<Tuple2<String, Integer>, String>() {
			private static final long serialVersionUID = 1L;

			@Override
			public void open(Configuration parameters) throws Exception {
				super.open(parameters);
				getRuntimeContext().getState(new ValueStateDescriptor<>("Test", Integer.class));
			}

			@Override
			public String map(Tuple2<String, Integer> value) throws Exception {
				return value.f0;
			}
		})
		.print();

	try {
		see.execute();
		fail();
	}
	catch (JobExecutionException e) {
		Throwable t = e.getCause();
		assertTrue("wrong exception", t instanceof SuccessException);
	}
}
 

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; //導入方法依賴的package包/類
/**
	 * This has to be manually executed to create the savepoint on Flink 1.1.
	 */
	@Test
	@Ignore
	public void testCreateSavepointOnFlink11WithRocksDB() throws Exception {

		final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
		env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);
		RocksDBStateBackend rocksBackend =
				new RocksDBStateBackend(new MemoryStateBackend());
//		rocksBackend.enableFullyAsyncSnapshots();
		env.setStateBackend(rocksBackend);
		env.enableCheckpointing(500);
		env.setParallelism(4);
		env.setMaxParallelism(4);

		// create source
		env
				.addSource(new LegacyCheckpointedSource(NUM_SOURCE_ELEMENTS)).setMaxParallelism(1).uid("LegacyCheckpointedSource")
				.flatMap(new LegacyCheckpointedFlatMap()).startNewChain().uid("LegacyCheckpointedFlatMap")
				.keyBy(0)
				.flatMap(new LegacyCheckpointedFlatMapWithKeyedState()).startNewChain().uid("LegacyCheckpointedFlatMapWithKeyedState")
				.keyBy(0)
				.flatMap(new KeyedStateSettingFlatMap()).startNewChain().uid("KeyedStateSettingFlatMap")
				.keyBy(0)
				.transform(
						"custom_operator",
						new TypeHint<Tuple2<Long, Long>>() {}.getTypeInfo(),
						new CheckpointedUdfOperator(new LegacyCheckpointedFlatMapWithKeyedState())).uid("LegacyCheckpointedOperator")
				.addSink(new AccumulatorCountingSink<Tuple2<Long, Long>>(EXPECTED_ELEMENTS_ACCUMULATOR));

		executeAndSavepoint(
				env,
				"src/test/resources/stateful-udf-migration-itcase-flink1.1-rocksdb-savepoint",
				new Tuple2<>(EXPECTED_ELEMENTS_ACCUMULATOR, NUM_SOURCE_ELEMENTS));
	}
 

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; //導入方法依賴的package包/類
@Test
public void testSavepointRestoreFromFlink11() throws Exception {

	final int expectedSuccessfulChecks = 21;

	final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
	env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);
	// we only test memory state backend yet
	env.setStateBackend(new MemoryStateBackend());
	env.enableCheckpointing(500);
	env.setParallelism(4);
	env.setMaxParallelism(4);

	// create source
	env
			.addSource(new RestoringCheckingSource(NUM_SOURCE_ELEMENTS)).setMaxParallelism(1).uid("LegacyCheckpointedSource")
			.flatMap(new RestoringCheckingFlatMap()).startNewChain().uid("LegacyCheckpointedFlatMap")
			.keyBy(0)
			.flatMap(new RestoringCheckingFlatMapWithKeyedState()).startNewChain().uid("LegacyCheckpointedFlatMapWithKeyedState")
			.keyBy(0)
			.flatMap(new KeyedStateCheckingFlatMap()).startNewChain().uid("KeyedStateSettingFlatMap")
			.keyBy(0)
			.transform(
					"custom_operator",
					new TypeHint<Tuple2<Long, Long>>() {}.getTypeInfo(),
					new RestoringCheckingUdfOperator(new RestoringCheckingFlatMapWithKeyedState())).uid("LegacyCheckpointedOperator")
			.addSink(new AccumulatorCountingSink<Tuple2<Long, Long>>(EXPECTED_ELEMENTS_ACCUMULATOR));

	restoreAndExecute(
			env,
			getResourceFilename("stateful-udf-migration-itcase-flink1.1-savepoint"),
			new Tuple2<>(SUCCESSFUL_CHECK_ACCUMULATOR, expectedSuccessfulChecks));
}
 

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; //導入方法依賴的package包/類
/**
 * Tests simple value state queryable state instance. Each source emits
 * (subtaskIndex, 0)..(subtaskIndex, numElements) tuples, which are then
 * queried. The tests succeeds after each subtask index is queried with
 * value numElements (the latest element updated the state).
 */
@Test
public void testValueState() throws Exception {

	final Deadline deadline = TEST_TIMEOUT.fromNow();
	final long numElements = 1024L;

	StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
	env.setStateBackend(stateBackend);
	env.setParallelism(maxParallelism);
	// Very important, because cluster is shared between tests and we
	// don't explicitly check that all slots are available before
	// submitting.
	env.setRestartStrategy(RestartStrategies.fixedDelayRestart(Integer.MAX_VALUE, 1000L));

	DataStream<Tuple2<Integer, Long>> source = env.addSource(new TestAscendingValueSource(numElements));

	// Value state
	ValueStateDescriptor<Tuple2<Integer, Long>> valueState = new ValueStateDescriptor<>("any", source.getType());

	source.keyBy(new KeySelector<Tuple2<Integer, Long>, Integer>() {
		private static final long serialVersionUID = 7662520075515707428L;

		@Override
		public Integer getKey(Tuple2<Integer, Long> value) {
			return value.f0;
		}
	}).asQueryableState("hakuna", valueState);

	try (AutoCancellableJob autoCancellableJob = new AutoCancellableJob(cluster, env, deadline)) {

		final JobID jobId = autoCancellableJob.getJobId();
		final JobGraph jobGraph = autoCancellableJob.getJobGraph();

		cluster.submitJobDetached(jobGraph);

		executeValueQuery(deadline, client, jobId, "hakuna", valueState, numElements);
	}
}
 

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; //導入方法依賴的package包/類
/**
 * Tests simple value state queryable state instance. Each source emits
 * (subtaskIndex, 0)..(subtaskIndex, numElements) tuples, which are then
 * queried. The tests succeeds after each subtask index is queried with
 * value numElements (the latest element updated the state).
 *
 * <p>This is the same as the simple value state test, but uses the API shortcut.
 */
@Test
public void testValueStateShortcut() throws Exception {

	final Deadline deadline = TEST_TIMEOUT.fromNow();
	final long numElements = 1024L;

	StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
	env.setStateBackend(stateBackend);
	env.setParallelism(maxParallelism);
	// Very important, because cluster is shared between tests and we
	// don't explicitly check that all slots are available before
	// submitting.
	env.setRestartStrategy(RestartStrategies.fixedDelayRestart(Integer.MAX_VALUE, 1000L));

	DataStream<Tuple2<Integer, Long>> source = env.addSource(new TestAscendingValueSource(numElements));

	// Value state shortcut
	final QueryableStateStream<Integer, Tuple2<Integer, Long>> queryableState =
			source.keyBy(new KeySelector<Tuple2<Integer, Long>, Integer>() {
				private static final long serialVersionUID = 9168901838808830068L;

				@Override
				public Integer getKey(Tuple2<Integer, Long> value) {
					return value.f0;
				}
			}).asQueryableState("matata");

	final ValueStateDescriptor<Tuple2<Integer, Long>> stateDesc =
			(ValueStateDescriptor<Tuple2<Integer, Long>>) queryableState.getStateDescriptor();

	try (AutoCancellableJob autoCancellableJob = new AutoCancellableJob(cluster, env, deadline)) {

		final JobID jobId = autoCancellableJob.getJobId();
		final JobGraph jobGraph = autoCancellableJob.getJobGraph();

		cluster.submitJobDetached(jobGraph);
		executeValueQuery(deadline, client, jobId, "matata", stateDesc, numElements);
	}
}
 

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; //導入方法依賴的package包/類
private JobGraph getFlinkJob(
        final int sourceParallelism,
        final String streamName,
        final int numElements) throws IOException {

    final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
    env.setParallelism(sourceParallelism);
    env.setRestartStrategy(RestartStrategies.fixedDelayRestart(3, 0L));

    // to make the test faster, we use a combination of fast triggering of checkpoints,
    // but some pauses after completed checkpoints
    env.getCheckpointConfig().setCheckpointInterval(100);
    env.getCheckpointConfig().setMinPauseBetweenCheckpoints(2000);

    // we currently need this to work around the case where tasks are
    // started too late, a checkpoint was already triggered, and some tasks
    // never see the checkpoint event
    env.getCheckpointConfig().setCheckpointTimeout(5000);

    // checkpoint to files (but aggregate state below 1 MB) and don't to any async checkpoints
    env.setStateBackend(new FsStateBackend(tmpFolder.newFolder().toURI(), 1024 * 1024, false));

    // the Pravega reader
    final FlinkPravegaReader<Integer> pravegaSource = new FlinkPravegaReader<>(
            SETUP_UTILS.getControllerUri(),
            SETUP_UTILS.getScope(),
            Collections.singleton(streamName),
            0,
            new IntDeserializer(),
            "my_reader_name");

    env
            .addSource(pravegaSource)

            // hook in the notifying mapper
            .map(new NotifyingMapper<>())
            .setParallelism(1)

            // the sink validates that the exactly-once semantics hold
            // it must be non-parallel so that it sees all elements and can trivially
            // check for duplicates
            .addSink(new IntSequenceExactlyOnceValidator(numElements))
            .setParallelism(1);
    
    return env.getStreamGraph().getJobGraph();
}
 

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; //導入方法依賴的package包/類
/**
 * Tests simple value state queryable state instance. Each source emits
 * (subtaskIndex, 0)..(subtaskIndex, numElements) tuples, which are then
 * queried. The tests succeeds after each subtask index is queried with
 * value numElements (the latest element updated the state).
 *
 * <p>This is the same as the simple value state test, but uses the API shortcut.
 */
@Test
public void testValueStateShortcut() throws Exception {
	// Config
	final Deadline deadline = TEST_TIMEOUT.fromNow();

	final long numElements = 1024L;

	JobID jobId = null;
	try {
		StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
		env.setStateBackend(stateBackend);
		env.setParallelism(maxParallelism);
		// Very important, because cluster is shared between tests and we
		// don't explicitly check that all slots are available before
		// submitting.
		env.setRestartStrategy(RestartStrategies.fixedDelayRestart(Integer.MAX_VALUE, 1000L));

		DataStream<Tuple2<Integer, Long>> source = env
				.addSource(new TestAscendingValueSource(numElements));

		// Value state shortcut
		QueryableStateStream<Integer, Tuple2<Integer, Long>> queryableState =
				source.keyBy(new KeySelector<Tuple2<Integer, Long>, Integer>() {
					private static final long serialVersionUID = 9168901838808830068L;

					@Override
					public Integer getKey(Tuple2<Integer, Long> value) throws Exception {
						return value.f0;
					}
				}).asQueryableState("matata");

		// Submit the job graph
		JobGraph jobGraph = env.getStreamGraph().getJobGraph();
		jobId = jobGraph.getJobID();

		cluster.submitJobDetached(jobGraph);

		final ValueStateDescriptor<Tuple2<Integer, Long>> stateDesc =
				(ValueStateDescriptor<Tuple2<Integer, Long>>) queryableState.getStateDescriptor();
		executeValueQuery(deadline, client, jobId, "matata", stateDesc, numElements);
	} finally {

		// Free cluster resources
		if (jobId != null) {
			CompletableFuture<CancellationSuccess> cancellation = FutureUtils.toJava(
					cluster.getLeaderGateway(deadline.timeLeft())
							.ask(new JobManagerMessages.CancelJob(jobId), deadline.timeLeft())
							.mapTo(ClassTag$.MODULE$.<CancellationSuccess>apply(CancellationSuccess.class)));

			cancellation.get(deadline.timeLeft().toMillis(), TimeUnit.MILLISECONDS);
		}
	}
}
 

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; //導入方法依賴的package包/類
/**
 * Tests simple value state queryable state instance. Each source emits
 * (subtaskIndex, 0)..(subtaskIndex, numElements) tuples, which are then
 * queried. The tests succeeds after each subtask index is queried with
 * value numElements (the latest element updated the state).
 */
@Test
public void testValueState() throws Exception {
	// Config
	final Deadline deadline = TEST_TIMEOUT.fromNow();

	final int numElements = 1024;

	final QueryableStateClient client = new QueryableStateClient(cluster.configuration());

	JobID jobId = null;
	try {
		StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
		env.setStateBackend(stateBackend);
		env.setParallelism(maxParallelism);
		// Very important, because cluster is shared between tests and we
		// don't explicitly check that all slots are available before
		// submitting.
		env.setRestartStrategy(RestartStrategies.fixedDelayRestart(Integer.MAX_VALUE, 1000));

		DataStream<Tuple2<Integer, Long>> source = env
				.addSource(new TestAscendingValueSource(numElements));

		// Value state
		ValueStateDescriptor<Tuple2<Integer, Long>> valueState = new ValueStateDescriptor<>(
				"any",
				source.getType());

		QueryableStateStream<Integer, Tuple2<Integer, Long>> queryableState =
				source.keyBy(new KeySelector<Tuple2<Integer, Long>, Integer>() {
					private static final long serialVersionUID = 7662520075515707428L;

					@Override
					public Integer getKey(Tuple2<Integer, Long> value) throws Exception {
						return value.f0;
					}
				}).asQueryableState("hakuna", valueState);

		// Submit the job graph
		JobGraph jobGraph = env.getStreamGraph().getJobGraph();
		jobId = jobGraph.getJobID();

		cluster.submitJobDetached(jobGraph);

		// Now query
		long expected = numElements;

		executeQuery(deadline, client, jobId, "hakuna", valueState, expected);
	} finally {
		// Free cluster resources
		if (jobId != null) {
			Future<CancellationSuccess> cancellation = cluster
					.getLeaderGateway(deadline.timeLeft())
					.ask(new JobManagerMessages.CancelJob(jobId), deadline.timeLeft())
					.mapTo(ClassTag$.MODULE$.<CancellationSuccess>apply(CancellationSuccess.class));

			Await.ready(cancellation, deadline.timeLeft());
		}

		client.shutDown();
	}
}