Hi Till, I am afraid it does not work in any case.
I am following the steps you indicate on your websites (for yarn configuration and loggers with slf4j): 1) Enable log aggregation in yarn-site: https://ci.apache.org/projects/flink/flink-docs-release-0.7/yarn_setup.html#log-files 2) Include Loggers as indicated here (see WordCountExample below): https://ci.apache.org/projects/flink/flink-docs-release-0.7/internal_logging.html But I cannot get the log messages that run in the map functions. Am I missing something? Thanks, Ana On 04 Jan 2016, at 14:00, Till Rohrmann <trohrm...@apache.org<mailto:trohrm...@apache.org>> wrote: I think the YARN application has to be finished in order for the logs to be accessible. Judging from you commands, you’re starting a long running YARN application running Flink with ./bin/yarn-session.sh -n 1 -tm 2048 -s 4. This cluster won’t be used though, because you’re executing your job with ./bin/flink run -m yarn-cluster which will start another YARN application which is only alive as long as the Flink job is executed. If you want to run your job on the long running YARN application, then you simply have to omit -m yarn-cluster. Cheers, Till On Mon, Jan 4, 2016 at 12:36 PM, Ana M. Martinez <a...@cs.aau.dk<mailto:a...@cs.aau.dk>> wrote: Hi Till, Sorry for the delay (Xmas break). I have activated log aggregation on flink-conf.yaml with yarn.log-aggregation-enable: true (as I can’t find a yarn-site.xml). But the command yarn logs -applicationId application_1451903796996_0008 gives me the following output: INFO client.RMProxy: Connecting to ResourceManager at xxx /var/log/hadoop-yarn/apps/hadoop/logs/application_1451903796996_0008does not exist. Log aggregation has not completed or is not enabled I’ve tried to restart the Flink JobManager and TaskManagers as follows: ./bin/yarn-session.sh -n 1 -tm 2048 -s 4 and then with a detached screen, run my application with ./bin/flink run -m yarn-cluster ... I am not sure if my problem is that I am not setting the log-aggregation-enable property well or I am not restarting the Flink JobManager and TaskManagers as I should… Any idea? Thanks, Ana On 18 Dec 2015, at 16:29, Till Rohrmann <trohrm...@apache.org<mailto:trohrm...@apache.org>> wrote: In which log file are you exactly looking for the logging statements? And on what machine? You have to look on the machines on which the yarn container were started. Alternatively if you have log aggregation activated, then you can simply retrieve the log files via yarn logs. Cheers, Till On Fri, Dec 18, 2015 at 3:49 PM, Ana M. Martinez <a...@cs.aau.dk<mailto:a...@cs.aau.dk>> wrote: Hi Till, Many thanks for your quick response. I have modified the WordCountExample to re-reproduce my problem in a simple example. I run the code below with the following command: ./bin/flink run -m yarn-cluster -yn 1 -ys 4 -yjm 1024 -ytm 1024 -c mypackage.WordCountExample ../flinklink.jar And if I check the log file I see all logger messages except the one in the flatMap function of the inner LineSplitter class, which is actually the one I am most interested in. Is that an expected behaviour? Thanks, Ana import org.apache.flink.api.common.functions.FlatMapFunction; import org.apache.flink.api.java.DataSet; import org.apache.flink.api.java.ExecutionEnvironment; import org.apache.flink.api.java.tuple.Tuple2; import org.apache.flink.util.Collector; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.Serializable; import java.util.ArrayList; import java.util.List; public class WordCountExample { static Logger logger = LoggerFactory.getLogger(WordCountExample.class); public static void main(String[] args) throws Exception { final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment(); logger.info("Entering application."); DataSet<String> text = env.fromElements( "Who's there?", "I think I hear them. Stand, ho! Who's there?"); List<Integer> elements = new ArrayList<Integer>(); elements.add(0); DataSet<TestClass> set = env.fromElements(new TestClass(elements)); DataSet<Tuple2<String, Integer>> wordCounts = text .flatMap(new LineSplitter()) .withBroadcastSet(set, "set") .groupBy(0) .sum(1); wordCounts.print(); } public static class LineSplitter implements FlatMapFunction<String, Tuple2<String, Integer>> { static Logger loggerLineSplitter = LoggerFactory.getLogger(LineSplitter.class); @Override public void flatMap(String line, Collector<Tuple2<String, Integer>> out) { loggerLineSplitter.info("Logger in LineSplitter.flatMap"); for (String word : line.split(" ")) { out.collect(new Tuple2<String, Integer>(word, 1)); } } } public static class TestClass implements Serializable { private static final long serialVersionUID = -2932037991574118651L; static Logger loggerTestClass = LoggerFactory.getLogger("WordCountExample.TestClass"); List<Integer> integerList; public TestClass(List<Integer> integerList){ this.integerList=integerList; loggerTestClass.info("Logger in TestClass"); } } } On 17 Dec 2015, at 16:08, Till Rohrmann <trohrm...@apache.org<mailto:trohrm...@apache.org>> wrote: Hi Ana, you can simply modify the `log4j.properties` file in the `conf` directory. It should be automatically included in the Yarn application. Concerning your logging problem, it might be that you have set the logging level too high. Could you share the code with us? Cheers, Till On Thu, Dec 17, 2015 at 1:56 PM, Ana M. Martinez <a...@cs.aau.dk<mailto:a...@cs.aau.dk>> wrote: Hi flink community, I am trying to show log messages using log4j. It works fine overall except for the messages I want to show in an inner class that implements org.apache.flink.api.common.aggregators.ConvergenceCriterion. I am very new to this, but it seems that I’m having problems to show the messages included in the isConverged function, as it runs in the task managers? E.g. the log messages in the outer class (before map-reduce operations) are properly shown. I am also interested in providing my own log4j.properties file. I am using the ./bin/flink run -m yarn-cluster on Amazon clusters. Thanks, Ana
