Java Code Examples for org.apache.flink.api.java.utils.DataSetUtils#countElementsPerPartition()

The following examples show how to use org.apache.flink.api.java.utils.DataSetUtils#countElementsPerPartition() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: SplitBatchOp.java    From Alink with Apache License 2.0 6 votes vote down vote up 
@Override
public SplitBatchOp linkFrom(BatchOperator<?>... inputs) {
    BatchOperator<?> in = checkAndGetFirst(inputs);
    final double fraction = getFraction();
    if (fraction < 0. || fraction > 1.0) {
        throw new RuntimeException("invalid fraction " + fraction);
    }

    DataSet<Row> rows = in.getDataSet();

    DataSet<Tuple2<Integer, Long>> countsPerPartition = DataSetUtils.countElementsPerPartition(rows);
    DataSet<long[]> numPickedPerPartition = countsPerPartition
        .mapPartition(new CountInPartition(fraction))
        .setParallelism(1)
        .name("decide_count_of_each_partition");

    DataSet<Row> out = rows
        .mapPartition(new PickInPartition())
        .withBroadcastSet(numPickedPerPartition, "counts")
        .name("pick_in_each_partition");

    this.setOutput(out, in.getSchema());
    this.setSideOutputTables(new Table[]{in.getOutputTable().minusAll(this.getOutputTable())});
    return this;
}
Example 2
Source File: BaseComQueue.java    From Alink with Apache License 2.0 6 votes vote down vote up 
private <T> void createRelationshipAndCachedData(DataSet<T> data, final String key) {
	final int localSessionId = sessionId;
	if (cacheDataRel == null) {
		cacheDataRel = clearObjs(
			BatchOperator
				.getExecutionEnvironmentFromDataSets(data)
				.fromElements(new byte[0])
				.mapPartition(new MapPartitionFunction<byte[], byte[]>() {
					@Override
					public void mapPartition(Iterable<byte[]> values, Collector<byte[]> out) throws Exception {
						//pass
					}
				})
		);
	}

	DataSet<Tuple2<Integer, Long>> rowCount = DataSetUtils.countElementsPerPartition(data);

	cacheDataRel = data.mapPartition(new PutCachedData<T>(key, localSessionId))
		.withBroadcastSet(cacheDataRel, "rel")
		.withBroadcastSet(rowCount, "rowCount")
		.name("cachedDataRel@" + key);

	cacheDataObjNames.add(key);
}
Example 3
Source File: DataSetUtilsITCase.java    From Flink-CEPplus with Apache License 2.0 5 votes vote down vote up 
@Test
public void testCountElementsPerPartition() throws Exception {
	ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
	long expectedSize = 100L;
	DataSet<Long> numbers = env.generateSequence(0, expectedSize - 1);

	DataSet<Tuple2<Integer, Long>> ds = DataSetUtils.countElementsPerPartition(numbers);

	Assert.assertEquals(env.getParallelism(), ds.count());
	Assert.assertEquals(expectedSize, ds.sum(1).collect().get(0).f1.longValue());
}
Example 4
Source File: DataSetUtilsITCase.java    From flink with Apache License 2.0 5 votes vote down vote up 
@Test
public void testCountElementsPerPartition() throws Exception {
	ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
	long expectedSize = 100L;
	DataSet<Long> numbers = env.generateSequence(0, expectedSize - 1);

	DataSet<Tuple2<Integer, Long>> ds = DataSetUtils.countElementsPerPartition(numbers);

	Assert.assertEquals(env.getParallelism(), ds.count());
	Assert.assertEquals(expectedSize, ds.sum(1).collect().get(0).f1.longValue());
}
Example 5
Source File: DataSetUtilsITCase.java    From flink with Apache License 2.0 5 votes vote down vote up 
@Test
public void testCountElementsPerPartition() throws Exception {
	ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
	long expectedSize = 100L;
	DataSet<Long> numbers = env.generateSequence(0, expectedSize - 1);

	DataSet<Tuple2<Integer, Long>> ds = DataSetUtils.countElementsPerPartition(numbers);

	Assert.assertEquals(env.getParallelism(), ds.count());
	Assert.assertEquals(expectedSize, ds.sum(1).collect().get(0).f1.longValue());
}
Example 6
Source File: BaseTuning.java    From Alink with Apache License 2.0 4 votes vote down vote up 
private DataSet<Tuple2<Integer, Row>> split(BatchOperator<?> data, int k) {

		DataSet<Row> input = shuffle(data.getDataSet());

		DataSet<Tuple2<Integer, Long>> counts = DataSetUtils.countElementsPerPartition(input);

		return input
			.mapPartition(new RichMapPartitionFunction<Row, Tuple2<Integer, Row>>() {
				long taskStart = 0L;
				long totalNumInstance = 0L;

				@Override
				public void open(Configuration parameters) throws Exception {
					List<Tuple2<Integer, Long>> counts1 = getRuntimeContext().getBroadcastVariable("counts");

					int taskId = getRuntimeContext().getIndexOfThisSubtask();
					for (Tuple2<Integer, Long> cnt : counts1) {

						if (taskId < cnt.f0) {
							taskStart += cnt.f1;
						}

						totalNumInstance += cnt.f1;
					}
				}

				@Override
				public void mapPartition(Iterable<Row> values, Collector<Tuple2<Integer, Row>> out) throws Exception {
					DistributedInfo distributedInfo = new DefaultDistributedInfo();
					Tuple2<Integer, Long> split1 = new Tuple2<>(-1, -1L);
					long lcnt = taskStart;

					for (int i = 0; i <= k; ++i) {
						long sp = distributedInfo.startPos(i, k, totalNumInstance);
						long lrc = distributedInfo.localRowCnt(i, k, totalNumInstance);

						if (taskStart < sp) {
							split1.f0 = i - 1;
							split1.f1 = distributedInfo.startPos(i - 1, k, totalNumInstance)
								+ distributedInfo.localRowCnt(i - 1, k, totalNumInstance);

							break;
						}

						if (taskStart == sp) {
							split1.f0 = i;
							split1.f1 = sp + lrc;

							break;
						}
					}

					for (Row val : values) {

						if (lcnt >= split1.f1) {
							split1.f0 += 1;
							split1.f1 = distributedInfo.localRowCnt(split1.f0, k, totalNumInstance) + lcnt;
						}

						out.collect(Tuple2.of(split1.f0, val));
						lcnt++;
					}
				}
			}).withBroadcastSet(counts, "counts");
	}