runners/samza/src/test/java/org/apache/beam/runners/samza/adapter/BoundedSourceSystemTest.java - beam - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
  * regarding copyright ownership.  The ASF licenses this file
  * to you under the Apache License, Version 2.0 (the
  * "License"); you may not use this file except in compliance
  * with the License.  You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 package org.apache.beam.runners.samza.adapter;

 import static org.apache.beam.runners.samza.adapter.TestSourceHelpers.createElementMessage;
 import static org.apache.beam.runners.samza.adapter.TestSourceHelpers.createEndOfStreamMessage;
 import static org.apache.beam.runners.samza.adapter.TestSourceHelpers.createWatermarkMessage;
 import static org.apache.beam.runners.samza.adapter.TestSourceHelpers.expectWrappedException;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;

 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.CountDownLatch;
 import org.apache.beam.runners.samza.SamzaPipelineOptions;
 import org.apache.beam.runners.samza.metrics.SamzaMetricsContainer;
 import org.apache.beam.sdk.io.BoundedSource;
 import org.apache.beam.sdk.options.PipelineOptionsFactory;
 import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
 import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.Sets;
 import org.apache.samza.Partition;
 import org.apache.samza.metrics.MetricsRegistryMap;
 import org.apache.samza.system.IncomingMessageEnvelope;
 import org.apache.samza.system.SystemConsumer;
 import org.apache.samza.system.SystemStreamPartition;
 import org.joda.time.Instant;
 import org.junit.Test;

 /** Tests for {@link BoundedSourceSystem}. */
 public class BoundedSourceSystemTest {
   private static final SystemStreamPartition DEFAULT_SSP =
       new SystemStreamPartition("default-system", "default-system", new Partition(0));

   // A reasonable time to wait to get all messages from the bounded source assuming no blocking.
   private static final long DEFAULT_TIMEOUT_MILLIS = 1000;
   private static final String NULL_STRING = null;

   @Test
   public void testConsumerStartStop() throws IOException, InterruptedException {
     final TestBoundedSource<String> source = TestBoundedSource.<String>createBuilder().build();

     final BoundedSourceSystem.Consumer<String> consumer = createConsumer(source);

     consumer.register(DEFAULT_SSP, "0");
     consumer.start();
     assertEquals(
         Arrays.asList(
             createWatermarkMessage(DEFAULT_SSP, BoundedWindow.TIMESTAMP_MAX_VALUE),
             createEndOfStreamMessage(DEFAULT_SSP)),
         consumeUntilTimeoutOrEos(consumer, DEFAULT_SSP, DEFAULT_TIMEOUT_MILLIS));
     consumer.stop();
   }

   @Test
   public void testConsumeOneMessage() throws IOException, InterruptedException {
     final TestBoundedSource<String> source =
         TestBoundedSource.<String>createBuilder().addElements("test").build();

     final BoundedSourceSystem.Consumer<String> consumer = createConsumer(source);

     consumer.register(DEFAULT_SSP, "0");
     consumer.start();
     assertEquals(
         Arrays.asList(
             createElementMessage(DEFAULT_SSP, "0", "test", BoundedWindow.TIMESTAMP_MIN_VALUE),
             createWatermarkMessage(DEFAULT_SSP, BoundedWindow.TIMESTAMP_MAX_VALUE),
             createEndOfStreamMessage(DEFAULT_SSP)),
         consumeUntilTimeoutOrEos(consumer, DEFAULT_SSP, DEFAULT_TIMEOUT_MILLIS));
     consumer.stop();
   }

   @Test
   public void testAdvanceTimestamp() throws InterruptedException {
     final Instant timestamp = Instant.now();

     final TestBoundedSource<String> source =
         TestBoundedSource.<String>createBuilder()
             .addElements("before")
             .setTimestamp(timestamp)
             .addElements("after")
             .build();

     final BoundedSourceSystem.Consumer<String> consumer = createConsumer(source);

     consumer.register(DEFAULT_SSP, "0");
     consumer.start();
     assertEquals(
         Arrays.asList(
             createElementMessage(DEFAULT_SSP, "0", "before", BoundedWindow.TIMESTAMP_MIN_VALUE),
             createElementMessage(DEFAULT_SSP, "1", "after", timestamp),
             createWatermarkMessage(DEFAULT_SSP, BoundedWindow.TIMESTAMP_MAX_VALUE),
             createEndOfStreamMessage(DEFAULT_SSP)),
         consumeUntilTimeoutOrEos(consumer, DEFAULT_SSP, DEFAULT_TIMEOUT_MILLIS));
     consumer.stop();
   }

   @Test
   public void testConsumeMultipleMessages() throws IOException, InterruptedException {
     final TestBoundedSource<String> source =
         TestBoundedSource.<String>createBuilder()
             .addElements("test", "a", "few", "messages")
             .build();

     final BoundedSourceSystem.Consumer<String> consumer = createConsumer(source);

     consumer.register(DEFAULT_SSP, "0");
     consumer.start();
     assertEquals(
         Arrays.asList(
             createElementMessage(DEFAULT_SSP, "0", "test", BoundedWindow.TIMESTAMP_MIN_VALUE),
             createElementMessage(DEFAULT_SSP, "1", "a", BoundedWindow.TIMESTAMP_MIN_VALUE),
             createElementMessage(DEFAULT_SSP, "2", "few", BoundedWindow.TIMESTAMP_MIN_VALUE),
             createElementMessage(DEFAULT_SSP, "3", "messages", BoundedWindow.TIMESTAMP_MIN_VALUE),
             createWatermarkMessage(DEFAULT_SSP, BoundedWindow.TIMESTAMP_MAX_VALUE),
             createEndOfStreamMessage(DEFAULT_SSP)),
         consumeUntilTimeoutOrEos(consumer, DEFAULT_SSP, DEFAULT_TIMEOUT_MILLIS));
     consumer.stop();
   }

   @Test
   public void testReaderThrowsAtStart() throws Exception {
     final IOException exception = new IOException("Expected exception");

     final TestBoundedSource<String> source =
         TestBoundedSource.<String>createBuilder().addException(exception).build();

     final BoundedSourceSystem.Consumer<String> consumer = createConsumer(source);

     consumer.register(DEFAULT_SSP, "0");
     consumer.start();
     expectWrappedException(
         exception, () -> consumeUntilTimeoutOrEos(consumer, DEFAULT_SSP, DEFAULT_TIMEOUT_MILLIS));
     consumer.stop();
   }

   @Test
   public void testReaderThrowsAtAdvance() throws Exception {
     final IOException exception = new IOException("Expected exception");

     final TestBoundedSource<String> source =
         TestBoundedSource.<String>createBuilder()
             .addElements("test", "a", "few", "good", "messages", "then", "...")
             .addException(exception)
             .build();

     final BoundedSourceSystem.Consumer<String> consumer = createConsumer(source);

     consumer.register(DEFAULT_SSP, "0");
     consumer.start();
     expectWrappedException(
         exception, () -> consumeUntilTimeoutOrEos(consumer, DEFAULT_SSP, DEFAULT_TIMEOUT_MILLIS));
     consumer.stop();
   }

   @Test
   public void testTimeout() throws Exception {
     final CountDownLatch advanceLatch = new CountDownLatch(1);

     final TestBoundedSource<String> source =
         TestBoundedSource.<String>createBuilder()
             .addElements("before")
             .addLatch(advanceLatch)
             .addElements("after")
             .build();

     final BoundedSourceSystem.Consumer<String> consumer = createConsumer(source);

     consumer.register(DEFAULT_SSP, "0");
     consumer.start();
     assertEquals(
         Collections.singletonList(
             createElementMessage(DEFAULT_SSP, "0", "before", BoundedWindow.TIMESTAMP_MIN_VALUE)),
         consumeUntilTimeoutOrEos(consumer, DEFAULT_SSP, DEFAULT_TIMEOUT_MILLIS));

     advanceLatch.countDown();

     assertEquals(
         Arrays.asList(
             createElementMessage(DEFAULT_SSP, "1", "after", BoundedWindow.TIMESTAMP_MIN_VALUE),
             createWatermarkMessage(DEFAULT_SSP, BoundedWindow.TIMESTAMP_MAX_VALUE),
             createEndOfStreamMessage(DEFAULT_SSP)),
         consumeUntilTimeoutOrEos(consumer, DEFAULT_SSP, DEFAULT_TIMEOUT_MILLIS));
     consumer.stop();
   }

   @Test
   public void testSplit() throws IOException, InterruptedException {
     final TestBoundedSource.SplittableBuilder<String> builder =
         TestBoundedSource.<String>createSplits(3);
     builder.forSplit(0).addElements("split-0");
     builder.forSplit(1).addElements("split-1");
     builder.forSplit(2).addElements("split-2");
     final TestBoundedSource<String> source = builder.build();

     final BoundedSourceSystem.Consumer<String> consumer = createConsumer(source, 3);

     consumer.register(ssp(0), NULL_STRING);
     consumer.register(ssp(1), NULL_STRING);
     consumer.register(ssp(2), NULL_STRING);
     consumer.start();

     final Set<String> offsets = new HashSet<>();

     // check split0
     List<IncomingMessageEnvelope> envelopes =
         consumeUntilTimeoutOrEos(consumer, ssp(0), DEFAULT_TIMEOUT_MILLIS);
     assertEquals(
         Arrays.asList(
             createElementMessage(
                 ssp(0), envelopes.get(0).getOffset(), "split-0", BoundedWindow.TIMESTAMP_MIN_VALUE),
             createWatermarkMessage(ssp(0), BoundedWindow.TIMESTAMP_MAX_VALUE),
             createEndOfStreamMessage(ssp(0))),
         envelopes);
     offsets.add(envelopes.get(0).getOffset());

     // check split1
     envelopes = consumeUntilTimeoutOrEos(consumer, ssp(1), DEFAULT_TIMEOUT_MILLIS);
     assertEquals(
         Arrays.asList(
             createElementMessage(
                 ssp(1), envelopes.get(0).getOffset(), "split-1", BoundedWindow.TIMESTAMP_MIN_VALUE),
             createWatermarkMessage(ssp(1), BoundedWindow.TIMESTAMP_MAX_VALUE),
             createEndOfStreamMessage(ssp(1))),
         envelopes);
     offsets.add(envelopes.get(0).getOffset());

     // check split2
     envelopes = consumeUntilTimeoutOrEos(consumer, ssp(2), DEFAULT_TIMEOUT_MILLIS);
     assertEquals(
         Arrays.asList(
             createElementMessage(
                 ssp(2), envelopes.get(0).getOffset(), "split-2", BoundedWindow.TIMESTAMP_MIN_VALUE),
             createWatermarkMessage(ssp(2), BoundedWindow.TIMESTAMP_MAX_VALUE),
             createEndOfStreamMessage(ssp(2))),
         envelopes);
     offsets.add(envelopes.get(0).getOffset());

     // check offsets
     assertEquals(Sets.newHashSet("0", "1", "2"), offsets);
     consumer.stop();
   }

   private static List<IncomingMessageEnvelope> consumeUntilTimeoutOrEos(
       SystemConsumer consumer, SystemStreamPartition ssp, long timeoutMillis)
       throws InterruptedException {
     assertTrue("Expected timeoutMillis (" + timeoutMillis + ") >= 0", timeoutMillis >= 0);

     final List<IncomingMessageEnvelope> accumulator = new ArrayList<>();
     final long start = System.currentTimeMillis();
     long now = start;
     while (timeoutMillis + start >= now) {
       accumulator.addAll(pollOnce(consumer, ssp, now - start - timeoutMillis));
       if (!accumulator.isEmpty() && accumulator.get(accumulator.size() - 1).isEndOfStream()) {
         break;
       }
       now = System.currentTimeMillis();
     }
     return accumulator;
   }

   private static List<IncomingMessageEnvelope> pollOnce(
       SystemConsumer consumer, SystemStreamPartition ssp, long timeoutMillis)
       throws InterruptedException {
     final Set<SystemStreamPartition> sspSet = Collections.singleton(ssp);
     final Map<SystemStreamPartition, List<IncomingMessageEnvelope>> pollResult =
         consumer.poll(sspSet, timeoutMillis);
     assertEquals(sspSet, pollResult.keySet());
     assertNotNull(pollResult.get(ssp));
     return pollResult.get(ssp);
   }

   private static <T> BoundedSourceSystem.Consumer<String> createConsumer(
       BoundedSource<String> source) {
     return createConsumer(source, 1);
   }

   private static BoundedSourceSystem.Consumer<String> createConsumer(
       BoundedSource<String> source, int splitNum) {
     SamzaPipelineOptions pipelineOptions = PipelineOptionsFactory.as(SamzaPipelineOptions.class);
     pipelineOptions.setMaxSourceParallelism(splitNum);
     return new BoundedSourceSystem.Consumer<>(
         source, pipelineOptions, new SamzaMetricsContainer(new MetricsRegistryMap()), "test-step");
   }

   private static SystemStreamPartition ssp(int partition) {
     return new SystemStreamPartition("default-system", "default-system", new Partition(partition));
   }
 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one
	* or more contributor license agreements. See the NOTICE file
	* distributed with this work for additional information
	* regarding copyright ownership. The ASF licenses this file
	* to you under the Apache License, Version 2.0 (the
	* "License"); you may not use this file except in compliance
	* with the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
	package org.apache.beam.runners.samza.adapter;

	import static org.apache.beam.runners.samza.adapter.TestSourceHelpers.createElementMessage;
	import static org.apache.beam.runners.samza.adapter.TestSourceHelpers.createEndOfStreamMessage;
	import static org.apache.beam.runners.samza.adapter.TestSourceHelpers.createWatermarkMessage;
	import static org.apache.beam.runners.samza.adapter.TestSourceHelpers.expectWrappedException;
	import static org.junit.Assert.assertEquals;
	import static org.junit.Assert.assertNotNull;
	import static org.junit.Assert.assertTrue;

	import java.io.IOException;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Collections;
	import java.util.HashSet;
	import java.util.List;
	import java.util.Map;
	import java.util.Set;
	import java.util.concurrent.CountDownLatch;
	import org.apache.beam.runners.samza.SamzaPipelineOptions;
	import org.apache.beam.runners.samza.metrics.SamzaMetricsContainer;
	import org.apache.beam.sdk.io.BoundedSource;
	import org.apache.beam.sdk.options.PipelineOptionsFactory;
	import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
	import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.Sets;
	import org.apache.samza.Partition;
	import org.apache.samza.metrics.MetricsRegistryMap;
	import org.apache.samza.system.IncomingMessageEnvelope;
	import org.apache.samza.system.SystemConsumer;
	import org.apache.samza.system.SystemStreamPartition;
	import org.joda.time.Instant;
	import org.junit.Test;

	/** Tests for {@link BoundedSourceSystem}. */
	public class BoundedSourceSystemTest {
	private static final SystemStreamPartition DEFAULT_SSP =
	new SystemStreamPartition("default-system", "default-system", new Partition(0));

	// A reasonable time to wait to get all messages from the bounded source assuming no blocking.
	private static final long DEFAULT_TIMEOUT_MILLIS = 1000;
	private static final String NULL_STRING = null;

	@Test
	public void testConsumerStartStop() throws IOException, InterruptedException {
	final TestBoundedSource<String> source = TestBoundedSource.<String>createBuilder().build();

	final BoundedSourceSystem.Consumer<String> consumer = createConsumer(source);

	consumer.register(DEFAULT_SSP, "0");
	consumer.start();
	assertEquals(
	Arrays.asList(
	createWatermarkMessage(DEFAULT_SSP, BoundedWindow.TIMESTAMP_MAX_VALUE),
	createEndOfStreamMessage(DEFAULT_SSP)),
	consumeUntilTimeoutOrEos(consumer, DEFAULT_SSP, DEFAULT_TIMEOUT_MILLIS));
	consumer.stop();
	}

	@Test
	public void testConsumeOneMessage() throws IOException, InterruptedException {
	final TestBoundedSource<String> source =
	TestBoundedSource.<String>createBuilder().addElements("test").build();

	final BoundedSourceSystem.Consumer<String> consumer = createConsumer(source);

	consumer.register(DEFAULT_SSP, "0");
	consumer.start();
	assertEquals(
	Arrays.asList(
	createElementMessage(DEFAULT_SSP, "0", "test", BoundedWindow.TIMESTAMP_MIN_VALUE),
	createWatermarkMessage(DEFAULT_SSP, BoundedWindow.TIMESTAMP_MAX_VALUE),
	createEndOfStreamMessage(DEFAULT_SSP)),
	consumeUntilTimeoutOrEos(consumer, DEFAULT_SSP, DEFAULT_TIMEOUT_MILLIS));
	consumer.stop();
	}

	@Test
	public void testAdvanceTimestamp() throws InterruptedException {
	final Instant timestamp = Instant.now();

	final TestBoundedSource<String> source =
	TestBoundedSource.<String>createBuilder()
	.addElements("before")
	.setTimestamp(timestamp)
	.addElements("after")
	.build();

	final BoundedSourceSystem.Consumer<String> consumer = createConsumer(source);

	consumer.register(DEFAULT_SSP, "0");
	consumer.start();
	assertEquals(
	Arrays.asList(
	createElementMessage(DEFAULT_SSP, "0", "before", BoundedWindow.TIMESTAMP_MIN_VALUE),
	createElementMessage(DEFAULT_SSP, "1", "after", timestamp),
	createWatermarkMessage(DEFAULT_SSP, BoundedWindow.TIMESTAMP_MAX_VALUE),
	createEndOfStreamMessage(DEFAULT_SSP)),
	consumeUntilTimeoutOrEos(consumer, DEFAULT_SSP, DEFAULT_TIMEOUT_MILLIS));
	consumer.stop();
	}

	@Test
	public void testConsumeMultipleMessages() throws IOException, InterruptedException {
	final TestBoundedSource<String> source =
	TestBoundedSource.<String>createBuilder()
	.addElements("test", "a", "few", "messages")
	.build();

	final BoundedSourceSystem.Consumer<String> consumer = createConsumer(source);

	consumer.register(DEFAULT_SSP, "0");
	consumer.start();
	assertEquals(
	Arrays.asList(
	createElementMessage(DEFAULT_SSP, "0", "test", BoundedWindow.TIMESTAMP_MIN_VALUE),
	createElementMessage(DEFAULT_SSP, "1", "a", BoundedWindow.TIMESTAMP_MIN_VALUE),
	createElementMessage(DEFAULT_SSP, "2", "few", BoundedWindow.TIMESTAMP_MIN_VALUE),
	createElementMessage(DEFAULT_SSP, "3", "messages", BoundedWindow.TIMESTAMP_MIN_VALUE),
	createWatermarkMessage(DEFAULT_SSP, BoundedWindow.TIMESTAMP_MAX_VALUE),
	createEndOfStreamMessage(DEFAULT_SSP)),
	consumeUntilTimeoutOrEos(consumer, DEFAULT_SSP, DEFAULT_TIMEOUT_MILLIS));
	consumer.stop();
	}

	@Test
	public void testReaderThrowsAtStart() throws Exception {
	final IOException exception = new IOException("Expected exception");

	final TestBoundedSource<String> source =
	TestBoundedSource.<String>createBuilder().addException(exception).build();

	final BoundedSourceSystem.Consumer<String> consumer = createConsumer(source);

	consumer.register(DEFAULT_SSP, "0");
	consumer.start();
	expectWrappedException(
	exception, () -> consumeUntilTimeoutOrEos(consumer, DEFAULT_SSP, DEFAULT_TIMEOUT_MILLIS));
	consumer.stop();
	}

	@Test
	public void testReaderThrowsAtAdvance() throws Exception {
	final IOException exception = new IOException("Expected exception");

	final TestBoundedSource<String> source =
	TestBoundedSource.<String>createBuilder()
	.addElements("test", "a", "few", "good", "messages", "then", "...")
	.addException(exception)
	.build();

	final BoundedSourceSystem.Consumer<String> consumer = createConsumer(source);

	consumer.register(DEFAULT_SSP, "0");
	consumer.start();
	expectWrappedException(
	exception, () -> consumeUntilTimeoutOrEos(consumer, DEFAULT_SSP, DEFAULT_TIMEOUT_MILLIS));
	consumer.stop();
	}

	@Test
	public void testTimeout() throws Exception {
	final CountDownLatch advanceLatch = new CountDownLatch(1);

	final TestBoundedSource<String> source =
	TestBoundedSource.<String>createBuilder()
	.addElements("before")
	.addLatch(advanceLatch)
	.addElements("after")
	.build();

	final BoundedSourceSystem.Consumer<String> consumer = createConsumer(source);

	consumer.register(DEFAULT_SSP, "0");
	consumer.start();
	assertEquals(
	Collections.singletonList(
	createElementMessage(DEFAULT_SSP, "0", "before", BoundedWindow.TIMESTAMP_MIN_VALUE)),
	consumeUntilTimeoutOrEos(consumer, DEFAULT_SSP, DEFAULT_TIMEOUT_MILLIS));

	advanceLatch.countDown();

	assertEquals(
	Arrays.asList(
	createElementMessage(DEFAULT_SSP, "1", "after", BoundedWindow.TIMESTAMP_MIN_VALUE),
	createWatermarkMessage(DEFAULT_SSP, BoundedWindow.TIMESTAMP_MAX_VALUE),
	createEndOfStreamMessage(DEFAULT_SSP)),
	consumeUntilTimeoutOrEos(consumer, DEFAULT_SSP, DEFAULT_TIMEOUT_MILLIS));
	consumer.stop();
	}

	@Test
	public void testSplit() throws IOException, InterruptedException {
	final TestBoundedSource.SplittableBuilder<String> builder =
	TestBoundedSource.<String>createSplits(3);
	builder.forSplit(0).addElements("split-0");
	builder.forSplit(1).addElements("split-1");
	builder.forSplit(2).addElements("split-2");
	final TestBoundedSource<String> source = builder.build();

	final BoundedSourceSystem.Consumer<String> consumer = createConsumer(source, 3);

	consumer.register(ssp(0), NULL_STRING);
	consumer.register(ssp(1), NULL_STRING);
	consumer.register(ssp(2), NULL_STRING);
	consumer.start();

	final Set<String> offsets = new HashSet<>();

	// check split0
	List<IncomingMessageEnvelope> envelopes =
	consumeUntilTimeoutOrEos(consumer, ssp(0), DEFAULT_TIMEOUT_MILLIS);
	assertEquals(
	Arrays.asList(
	createElementMessage(
	ssp(0), envelopes.get(0).getOffset(), "split-0", BoundedWindow.TIMESTAMP_MIN_VALUE),
	createWatermarkMessage(ssp(0), BoundedWindow.TIMESTAMP_MAX_VALUE),
	createEndOfStreamMessage(ssp(0))),
	envelopes);
	offsets.add(envelopes.get(0).getOffset());

	// check split1
	envelopes = consumeUntilTimeoutOrEos(consumer, ssp(1), DEFAULT_TIMEOUT_MILLIS);
	assertEquals(
	Arrays.asList(
	createElementMessage(
	ssp(1), envelopes.get(0).getOffset(), "split-1", BoundedWindow.TIMESTAMP_MIN_VALUE),
	createWatermarkMessage(ssp(1), BoundedWindow.TIMESTAMP_MAX_VALUE),
	createEndOfStreamMessage(ssp(1))),
	envelopes);
	offsets.add(envelopes.get(0).getOffset());

	// check split2
	envelopes = consumeUntilTimeoutOrEos(consumer, ssp(2), DEFAULT_TIMEOUT_MILLIS);
	assertEquals(
	Arrays.asList(
	createElementMessage(
	ssp(2), envelopes.get(0).getOffset(), "split-2", BoundedWindow.TIMESTAMP_MIN_VALUE),
	createWatermarkMessage(ssp(2), BoundedWindow.TIMESTAMP_MAX_VALUE),
	createEndOfStreamMessage(ssp(2))),
	envelopes);
	offsets.add(envelopes.get(0).getOffset());

	// check offsets
	assertEquals(Sets.newHashSet("0", "1", "2"), offsets);
	consumer.stop();
	}

	private static List<IncomingMessageEnvelope> consumeUntilTimeoutOrEos(
	SystemConsumer consumer, SystemStreamPartition ssp, long timeoutMillis)
	throws InterruptedException {
	assertTrue("Expected timeoutMillis (" + timeoutMillis + ") >= 0", timeoutMillis >= 0);

	final List<IncomingMessageEnvelope> accumulator = new ArrayList<>();
	final long start = System.currentTimeMillis();
	long now = start;
	while (timeoutMillis + start >= now) {
	accumulator.addAll(pollOnce(consumer, ssp, now - start - timeoutMillis));
	if (!accumulator.isEmpty() && accumulator.get(accumulator.size() - 1).isEndOfStream()) {
	break;
	}
	now = System.currentTimeMillis();
	}
	return accumulator;
	}

	private static List<IncomingMessageEnvelope> pollOnce(
	SystemConsumer consumer, SystemStreamPartition ssp, long timeoutMillis)
	throws InterruptedException {
	final Set<SystemStreamPartition> sspSet = Collections.singleton(ssp);
	final Map<SystemStreamPartition, List<IncomingMessageEnvelope>> pollResult =
	consumer.poll(sspSet, timeoutMillis);
	assertEquals(sspSet, pollResult.keySet());
	assertNotNull(pollResult.get(ssp));
	return pollResult.get(ssp);
	}

	private static <T> BoundedSourceSystem.Consumer<String> createConsumer(
	BoundedSource<String> source) {
	return createConsumer(source, 1);
	}

	private static BoundedSourceSystem.Consumer<String> createConsumer(
	BoundedSource<String> source, int splitNum) {
	SamzaPipelineOptions pipelineOptions = PipelineOptionsFactory.as(SamzaPipelineOptions.class);
	pipelineOptions.setMaxSourceParallelism(splitNum);
	return new BoundedSourceSystem.Consumer<>(
	source, pipelineOptions, new SamzaMetricsContainer(new MetricsRegistryMap()), "test-step");
	}

	private static SystemStreamPartition ssp(int partition) {
	return new SystemStreamPartition("default-system", "default-system", new Partition(partition));
	}
	}