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From StephanEwen <...@git.apache.org>
Subject [GitHub] flink pull request: [FLINK-1297] Added OperatorStatsAccumulator fo...
Date Tue, 21 Apr 2015 19:59:51 GMT
Github user StephanEwen commented on a diff in the pull request:

    https://github.com/apache/flink/pull/605#discussion_r28816129
  
    --- Diff: flink-contrib/src/test/java/org/apache/flink/contrib/operatorstatistics/OperatorStatsAccumulatorsTest.java
---
    @@ -0,0 +1,144 @@
    +/*
    + * 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.flink.contrib.operatorstatistics;
    +
    +import org.apache.flink.api.common.JobExecutionResult;
    +import org.apache.flink.api.common.accumulators.Accumulator;
    +import org.apache.flink.api.common.functions.RichFlatMapFunction;
    +import org.apache.flink.api.java.ExecutionEnvironment;
    +import org.apache.flink.api.java.io.DiscardingOutputFormat;
    +import org.apache.flink.api.java.tuple.Tuple1;
    +import org.apache.flink.configuration.Configuration;
    +import org.apache.flink.test.util.AbstractTestBase;
    +import org.apache.flink.util.Collector;
    +import org.junit.Assert;
    +import org.junit.Test;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import java.io.Serializable;
    +import java.util.Map;
    +import java.util.Random;
    +
    +public class OperatorStatsAccumulatorsTest extends AbstractTestBase {
    +
    +	private static final Logger LOG = LoggerFactory.getLogger(OperatorStatsAccumulatorsTest.class);
    +
    +	private static final String ACCUMULATOR_NAME = "op-stats";
    +
    +	public OperatorStatsAccumulatorsTest(){
    +		super(new Configuration());
    +	}
    +
    +	@Test
    +	public void testAccumulator() throws Exception {
    +
    +		String input = "";
    +
    +		Random rand = new Random();
    +
    +		for (int i = 1; i < 1000; i++) {
    +			if(rand.nextDouble()<0.2){
    +				input+=String.valueOf(rand.nextInt(5))+"\n";
    +			}else{
    +				input+=String.valueOf(rand.nextInt(100))+"\n";
    +			}
    +		}
    +
    +		String inputFile = createTempFile("datapoints.txt", input);
    +
    +		ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
    +
    +		env.readTextFile(inputFile).
    +				flatMap(new StringToInt()).
    +				output(new DiscardingOutputFormat<Tuple1<Integer>>());
    +
    +		JobExecutionResult result = env.execute();
    +
    +		OperatorStatistics globalStats = result.getAccumulatorResult(ACCUMULATOR_NAME);
    +		LOG.debug("Global Stats");
    +		LOG.debug(globalStats.toString());
    +
    +		OperatorStatistics merged = null;
    +
    +		Map<String,Object> accResults = result.getAllAccumulatorResults();
    +		for (String accumulatorName:accResults.keySet()){
    +			if (accumulatorName.contains(ACCUMULATOR_NAME+"-")){
    +				OperatorStatistics localStats = (OperatorStatistics) accResults.get(accumulatorName);
    +				if (merged == null){
    +					merged = localStats.clone();
    +				}else {
    +					merged.merge(localStats);
    +				}
    +				LOG.debug("Local Stats: " + accumulatorName);
    +				LOG.debug(localStats.toString());
    +			}
    +		}
    +
    +		Assert.assertEquals(globalStats.cardinality,999);
    +		Assert.assertEquals(globalStats.estimateCountDistinct(),100);
    +		Assert.assertTrue(globalStats.getHeavyHitters().size()>0 && globalStats.getHeavyHitters().size()<=5);
    +		Assert.assertEquals(merged.getMin(),globalStats.getMin());
    +		Assert.assertEquals(merged.getMax(),globalStats.getMax());
    +		Assert.assertEquals(merged.estimateCountDistinct(),globalStats.estimateCountDistinct());
    +		Assert.assertEquals(merged.getHeavyHitters().size(),globalStats.getHeavyHitters().size());
    +
    +	}
    +
    +	public static class StringToInt extends RichFlatMapFunction<String, Tuple1<Integer>>
{
    +
    +		// Is instantiated later since the runtime context is not yet initialized
    +		private Accumulator<Object, Serializable> globalAccumulator;
    +		private Accumulator<Object,Serializable>[] localAccumulators;
    --- End diff --
    
    Can you elaborate what you mean by "event notification logic for pluggable components"?
I am a bit confused here ;-)


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