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From Till Rohrmann <trohrm...@apache.org>
Subject Re: Problem to show logs in task managers
Date Fri, 08 Jan 2016 15:24:03 GMT
You’re right that the log statements of the LineSplitter are in the logs of
the cluster nodes, because that’s where the LineSplitter code is executed.
In contrast, you create a TestClass on the client when you submit the
program. Therefore, you see the logging statement “Logger in TestClass” on
the command line or in the cli log file.

So I would assume that the problem is Yarn’s log aggregation. Either your
configuration is not correct or there are still some Yarn containers
running after the Flink job has finished. Yarn will only show you the logs
after all containers are terminated. Maybe you could check that.
Alternatively, you can try to retrieve the taskmanager logs manually by
going to the machine where your yarn container was executed. Then under
hadoop/logs/userlogs you should find somewhere the logs.

Cheers,
Till
​

On Fri, Jan 8, 2016 at 3:50 PM, Ana M. Martinez <ana@cs.aau.dk> wrote:

> Thanks for the tip Robert! It was a good idea to rule out other possible
> causes, but I am afraid that is not the problem. If we stick to the
> WordCountExample (for simplicity), the Exception is thrown if placed into
> the flatMap function.
>
> I am going to try to re-write my problem and all the settings below:
>
> When I try to aggregate all logs:
>  $yarn logs -applicationId application_1452250761414_0005
>
> the following message is retrieved:
> 16/01/08 13:32:37 INFO client.RMProxy: Connecting to ResourceManager at
> ip-172-31-33-221.us-west-2.compute.internal/172.31.33.221:8032
> /var/log/hadoop-yarn/apps/hadoop/logs/application_1452250761414_0005does
> not exist.
> Log aggregation has not completed or is not enabled.
>
> (Tried the same command a few minutes later and got the same message, so
> might it be that log aggregation is not properly enabled??)
>
> I am going to carefully enumerate all the steps I have followed (and
> settings) to see if someone can identify why the Logger messages from CORE
> nodes (in an Amazon cluster) are not shown.
>
> 1) Enable yarn.log-aggregation-enable property to true
> in /etc/alternatives/hadoop-conf/yarn-site.xml.
>
> 2) Include log messages in my WordCountExample as follows:
>
> 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.core.fs.FileSystem;
> 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.writeAsText(*“*output.txt", FileSystem.WriteMode.OVERWRITE);
>
>
>     }
>
>     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));
>     			//throw new RuntimeException("LineSplitter class called");
> 		}
>
>         }
>     }
>
>     public static class TestClass implements Serializable {
>         private static final long serialVersionUID = -2932037991574118651L;
>
>         static Logger loggerTestClass = LoggerFactory.getLogger("TestClass.class");
>
>         List<Integer> integerList;
>         public TestClass(List<Integer> integerList){
>             this.integerList=integerList;
>             loggerTestClass.info("Logger in TestClass");
>         }
>
>
>     }
> }
>
> 3) Start a yarn-cluster and execute my program with the following command:
>
> $./bin/flink run -m yarn-cluster -yn 1 -ys 4 -yjm 1024 -ytm 1024 -c
> eu.amidst.flinklink.examples.WordCountExample ../flinklink.jar
>
>
> 4) The output in the log folder is as follows:
>
> 13:31:04,945 INFO  org.apache.flink.client.CliFrontend
>       -
> --------------------------------------------------------------------------------
> 13:31:04,947 INFO  org.apache.flink.client.CliFrontend
>       -  Starting Command Line Client (Version: 0.10.0, Rev:ab2cca4,
> Date:10.11.2015 @ 13:50:14 UTC)
> 13:31:04,947 INFO  org.apache.flink.client.CliFrontend
>       -  Current user: hadoop
> 13:31:04,947 INFO  org.apache.flink.client.CliFrontend
>       -  JVM: OpenJDK 64-Bit Server VM - Oracle Corporation - 1.8/25.65-b01
> 13:31:04,947 INFO  org.apache.flink.client.CliFrontend
>       -  Maximum heap size: 3344 MiBytes
> 13:31:04,947 INFO  org.apache.flink.client.CliFrontend
>       -  JAVA_HOME: /etc/alternatives/jre
> 13:31:04,950 INFO  org.apache.flink.client.CliFrontend
>       -  Hadoop version: 2.6.0
> 13:31:04,950 INFO  org.apache.flink.client.CliFrontend
>       -  JVM Options:
> 13:31:04,950 INFO  org.apache.flink.client.CliFrontend
>       -
> -Dlog.file=/home/hadoop/flink-0.10.0/log/flink-hadoop-client-ip-172-31-33-221.log
> 13:31:04,950 INFO  org.apache.flink.client.CliFrontend
>       -
> -Dlog4j.configuration=file:/home/hadoop/flink-0.10.0/conf/log4j-cli.properties
> 13:31:04,950 INFO  org.apache.flink.client.CliFrontend
>       -
> -Dlogback.configurationFile=file:/home/hadoop/flink-0.10.0/conf/logback.xml
> 13:31:04,951 INFO  org.apache.flink.client.CliFrontend
>       -  Program Arguments:
> 13:31:04,951 INFO  org.apache.flink.client.CliFrontend
>       -     run
> 13:31:04,951 INFO  org.apache.flink.client.CliFrontend
>       -     -m
> 13:31:04,951 INFO  org.apache.flink.client.CliFrontend
>       -     yarn-cluster
> 13:31:04,951 INFO  org.apache.flink.client.CliFrontend
>       -     -yn
> 13:31:04,951 INFO  org.apache.flink.client.CliFrontend
>       -     1
> 13:31:04,951 INFO  org.apache.flink.client.CliFrontend
>       -     -ys
> 13:31:04,951 INFO  org.apache.flink.client.CliFrontend
>       -     4
> 13:31:04,951 INFO  org.apache.flink.client.CliFrontend
>       -     -yjm
> 13:31:04,951 INFO  org.apache.flink.client.CliFrontend
>       -     1024
> 13:31:04,951 INFO  org.apache.flink.client.CliFrontend
>       -     -ytm
> 13:31:04,951 INFO  org.apache.flink.client.CliFrontend
>       -     1024
> 13:31:04,952 INFO  org.apache.flink.client.CliFrontend
>       -     -c
> 13:31:04,952 INFO  org.apache.flink.client.CliFrontend
>       -     eu.amidst.flinklink.examples.WordCountExample
> 13:31:04,952 INFO  org.apache.flink.client.CliFrontend
>       -     ../flinklink.jar
> 13:31:04,952 INFO  org.apache.flink.client.CliFrontend
>       -
> --------------------------------------------------------------------------------
> 13:31:04,954 INFO  org.apache.flink.client.CliFrontend
>       - Using configuration directory /home/hadoop/flink-0.10.0/conf
> 13:31:04,954 INFO  org.apache.flink.client.CliFrontend
>       - Trying to load configuration file
> 13:31:05,193 INFO  org.apache.flink.client.CliFrontend
>       - Running 'run' command.
> 13:31:05,201 INFO  org.apache.flink.client.CliFrontend
>       - Building program from JAR file
> 13:31:05,326 INFO  org.apache.flink.client.CliFrontend
>       - YARN cluster mode detected. Switching Log4j output to console
> 13:31:05,385 INFO  org.apache.hadoop.yarn.client.RMProxy
>       - Connecting to ResourceManager at ip-172-31-33-221.us
> -west-2.compute.internal/172.31.33.221:8032
> 13:31:05,534 INFO  org.apache.flink.client.FlinkYarnSessionCli
>       - No path for the flink jar passed. Using the location of class
> org.apache.flink.yarn.FlinkYarnClient to locate the jar
> 13:31:05,545 INFO  org.apache.flink.yarn.FlinkYarnClient
>       - Using values:
> 13:31:05,547 INFO  org.apache.flink.yarn.FlinkYarnClient
>       - TaskManager count = 1
> 13:31:05,547 INFO  org.apache.flink.yarn.FlinkYarnClient
>       - JobManager memory = 1024
> 13:31:05,547 INFO  org.apache.flink.yarn.FlinkYarnClient
>       - TaskManager memory = 1024
> 13:31:06,112 INFO  org.apache.flink.yarn.Utils
>       - Copying from
> file:/home/hadoop/flink-0.10.0/lib/flink-dist-0.10.0.jar to
> hdfs://ip-172-31-33-221.us-west-2.compute.internal:8020/user/hadoop/.flink/application_1452250761414_0005/flink-dist-0.10.0.jar
> 13:31:06,843 INFO  org.apache.flink.yarn.Utils
>       - Copying from /home/hadoop/flink-0.10.0/conf/flink-conf.yaml to
> hdfs://ip-172-31-33-221.us-west-2.compute.internal:8020/user/hadoop/.flink/application_1452250761414_0005/flink-conf.yaml
> 13:31:06,857 INFO  org.apache.flink.yarn.Utils
>       - Copying from file:/home/hadoop/flink-0.10.0/conf/logback.xml to
> hdfs://ip-172-31-33-221.us-west-2.compute.internal:8020/user/hadoop/.flink/application_1452250761414_0005/logback.xml
> 13:31:06,869 INFO  org.apache.flink.yarn.Utils
>       - Copying from file:/home/hadoop/flink-0.10.0/conf/log4j.properties
> to
> hdfs://ip-172-31-33-221.us-west-2.compute.internal:8020/user/hadoop/.flink/application_1452250761414_0005/log4j.properties
> 13:31:06,892 INFO  org.apache.flink.yarn.FlinkYarnClient
>       - Submitting application master application_1452250761414_0005
> 13:31:06,917 INFO  org.apache.hadoop.yarn.client.api.impl.YarnClientImpl
>       - Submitted application application_1452250761414_0005
> 13:31:06,917 INFO  org.apache.flink.yarn.FlinkYarnClient
>       - Waiting for the cluster to be allocated
> 13:31:06,919 INFO  org.apache.flink.yarn.FlinkYarnClient
>       - Deploying cluster, current state ACCEPTED
> 13:31:07,920 INFO  org.apache.flink.yarn.FlinkYarnClient
>       - Deploying cluster, current state ACCEPTED
> 13:31:08,922 INFO  org.apache.flink.yarn.FlinkYarnClient
>       - Deploying cluster, current state ACCEPTED
> 13:31:09,924 INFO  org.apache.flink.yarn.FlinkYarnClient
>       - Deploying cluster, current state ACCEPTED
> 13:31:10,925 INFO  org.apache.flink.yarn.FlinkYarnClient
>       - YARN application has been deployed successfully.
> 13:31:10,929 INFO  org.apache.flink.yarn.FlinkYarnCluster
>       - Start actor system.
> 13:31:11,412 INFO  akka.event.slf4j.Slf4jLogger
>       - Slf4jLogger started
> 13:31:11,472 INFO  Remoting
>       - Starting remoting
> 13:31:11,698 INFO  Remoting
>       - Remoting started; listening on addresses :[
> akka.tcp://flink@172.31.33.221:39464]
> 13:31:11,733 INFO  org.apache.flink.yarn.FlinkYarnCluster
>       - Start application client.
> 13:31:11,737 INFO  org.apache.flink.client.CliFrontend
>       - YARN cluster started
> 13:31:11,737 INFO  org.apache.flink.client.CliFrontend
>       - JobManager web interface address
> http://ip-172-31-33-221.us-west-2.compute.internal:20888/proxy/application_1452250761414_0005/
> 13:31:11,737 INFO  org.apache.flink.client.CliFrontend
>       - Waiting until all TaskManagers have connected
> 13:31:11,748 INFO  org.apache.flink.yarn.ApplicationClient
>       - Notification about new leader address
> akka.tcp://flink@172.31.45.98:46965/user/jobmanager with session ID null.
> 13:31:11,752 INFO  org.apache.flink.client.CliFrontend
>       - No status updates from the YARN cluster received so far. Waiting ...
> 13:31:11,752 INFO  org.apache.flink.yarn.ApplicationClient
>       - Received address of new leader
> akka.tcp://flink@172.31.45.98:46965/user/jobmanager with session ID null.
> 13:31:11,753 INFO  org.apache.flink.yarn.ApplicationClient
>       - Disconnect from JobManager null.
> 13:31:11,757 INFO  org.apache.flink.yarn.ApplicationClient
>       - Trying to register at JobManager
> akka.tcp://flink@172.31.45.98:46965/user/jobmanager.
> 13:31:12,040 INFO  org.apache.flink.yarn.ApplicationClient
>       - Successfully registered at the JobManager Actor[
> akka.tcp://flink@172.31.45.98:46965/user/jobmanager#1549383782]
> 13:31:12,253 INFO  org.apache.flink.client.CliFrontend
>       - TaskManager status (0/1)
> 13:31:12,753 INFO  org.apache.flink.client.CliFrontend
>       - TaskManager status (0/1)
> 13:31:13,254 INFO  org.apache.flink.client.CliFrontend
>       - TaskManager status (0/1)
> 13:31:13,755 INFO  org.apache.flink.client.CliFrontend
>       - TaskManager status (0/1)
> 13:31:14,255 INFO  org.apache.flink.client.CliFrontend
>       - TaskManager status (0/1)
> 13:31:14,756 INFO  org.apache.flink.client.CliFrontend
>       - TaskManager status (0/1)
> 13:31:15,257 INFO  org.apache.flink.client.CliFrontend
>       - TaskManager status (0/1)
> 13:31:15,758 INFO  org.apache.flink.client.CliFrontend
>       - TaskManager status (0/1)
> 13:31:16,258 INFO  org.apache.flink.client.CliFrontend
>       - All TaskManagers are connected
> 13:31:16,264 INFO  org.apache.flink.client.program.Client
>       - Starting client actor system
> 13:31:16,265 INFO  org.apache.flink.runtime.client.JobClient
>       - Starting JobClient actor system
> 13:31:16,283 INFO  akka.event.slf4j.Slf4jLogger
>       - Slf4jLogger started
> 13:31:16,288 INFO  Remoting
>       - Starting remoting
> 13:31:16,301 INFO  Remoting
>       - Remoting started; listening on addresses :[
> akka.tcp://flink@127.0.0.1:45919]
> 13:31:16,302 INFO  org.apache.flink.runtime.client.JobClient
>       - Started JobClient actor system at 127.0.0.1:45919
> 13:31:16,302 INFO  org.apache.flink.client.CliFrontend
>       - Using the parallelism provided by the remote cluster (4). To use
> another parallelism, set it at the ./bin/flink client.
> 13:31:16,302 INFO  org.apache.flink.client.CliFrontend
>       - Starting execution of program
> 13:31:16,303 INFO  org.apache.flink.client.program.Client
>       - Starting program in interactive mode
> 13:31:16,313 INFO  eu.amidst.flinklink.examples.WordCountExample
>       - Entering application.
> 13:31:16,342 INFO  TestClass.class
>       - Logger in TestClass
> 13:31:16,346 INFO  org.apache.flink.api.java.typeutils.TypeExtractor
>       - class eu.amidst.flinklink.examples.WordCountExample$TestClass is
> not a valid POJO type
> 13:31:16,376 INFO  org.apache.flink.client.CliFrontend
>       - Program execution finished
> 13:31:16,384 INFO  akka.remote.RemoteActorRefProvider$RemotingTerminator
>       - Shutting down remote daemon.
> 13:31:16,386 INFO  akka.remote.RemoteActorRefProvider$RemotingTerminator
>       - Remote daemon shut down; proceeding with flushing remote transports.
> 13:31:16,408 INFO  akka.remote.RemoteActorRefProvider$RemotingTerminator
>       - Remoting shut down.
> 13:31:16,431 INFO  org.apache.flink.client.CliFrontend
>       - Shutting down YARN cluster
> 13:31:16,431 INFO  org.apache.flink.yarn.FlinkYarnCluster
>       - Sending shutdown request to the Application Master
> 13:31:16,432 INFO  org.apache.flink.yarn.ApplicationClient
>       - Sending StopYarnSession request to ApplicationMaster.
> 13:31:16,568 INFO  org.apache.flink.yarn.ApplicationClient
>       - Remote JobManager has been stopped successfully. Stopping local
> application client
> 13:31:16,570 INFO  org.apache.flink.yarn.ApplicationClient
>       - Stopped Application client.
> 13:31:16,570 INFO  org.apache.flink.yarn.ApplicationClient
>       - Disconnect from JobManager Actor[
> akka.tcp://flink@172.31.45.98:46965/user/jobmanager#1549383782].
> 13:31:16,573 INFO  akka.remote.RemoteActorRefProvider$RemotingTerminator
>       - Shutting down remote daemon.
> 13:31:16,573 INFO  akka.remote.RemoteActorRefProvider$RemotingTerminator
>       - Remote daemon shut down; proceeding with flushing remote transports.
> 13:31:16,584 INFO  akka.remote.RemoteActorRefProvider$RemotingTerminator
>       - Remoting shut down.
> 13:31:16,595 INFO  org.apache.flink.yarn.FlinkYarnCluster
>       - Deleting files in
> hdfs://ip-172-31-33-221.us-west-2.compute.internal:8020/user/hadoop/.flink/application_1452250761414_0005
> 13:31:16,596 INFO  org.apache.flink.yarn.FlinkYarnCluster
>       - Application application_1452250761414_0005 finished with state
> FINISHED and final state SUCCEEDED at 1452259876445
> 13:31:16,747 INFO  org.apache.flink.yarn.FlinkYarnCluster
>       - YARN Client is shutting down
>
>
> You can see the log messages from the WordCountExample and TestClass
> classes. But I have problems to show the logger message (INFO) in the
> LineSplitter class. Presumably, because it is executed in the CORE nodes
> and node in the MASTER node (it all runs well in my local computer).
>
> Any tips?
> Ana
>
>
> On 06 Jan 2016, at 15:58, Ana M. Martinez <ana@cs.aau.dk> wrote:
>
> 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 <trohrmann@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 <ana@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 <trohrmann@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 <ana@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 <trohrmann@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 <ana@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
>>>
>>>
>>>
>>>
>>
>>
>
>
>

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