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https://issues.apache.org/jira/browse/FLINK-16488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17055812#comment-17055812
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Stephan Ewen commented on FLINK-16488:
--------------------------------------
Is that kubernetes specific, or is it related to the way the Docker entrypoint
scripts set up the logging?
[~azagrebin] is working on cleaning this up, would be good to validate that
this here is solved by that effort as well.
https://cwiki.apache.org/confluence/display/FLINK/FLIP-111%3A+Docker+image+unification
> Logging issues when running through K8s
> ---------------------------------------
>
> Key: FLINK-16488
> URL: https://issues.apache.org/jira/browse/FLINK-16488
> Project: Flink
> Issue Type: Bug
> Components: Deployment / Kubernetes
> Affects Versions: 1.8.0
> Reporter: John Mathews
> Priority: Major
>
> When running a slim downed version of the wordcount example, I am seeing some
> very strange logging behavior when running using the K8's setup described on
> the site. Essentially, every log line before the env.execute() shows up and
> every log line after does not (verified both through the UI, and by grepping
> within the container itself through K8s).
>
> Running the code below displays the following output:
>
> 2020-03-07 23:14:06,967 INFO _TOKEN_LOG_1
> 2020-03-07 23:14:06,968 INFO _TOKEN_LOG_2
> 2020-03-07 23:14:06,968 INFO _TOKEN_LOG_3
> 2020-03-07 23:14:06,970 INFO _TOKEN_LOG_4
> 2020-03-07 23:14:06,970 INFO _TOKEN_LOG_5
>
> The job completes successfully, but there is no sign of either a _TOKEN_LOG_6
> nor a _TOKEN_LOG_ERROR, and the counts themselves don't print. I have tested
> a few permutations of this, and all logging stops as soon as an
> environment.execute* command is called.
>
>
> Any idea on what is happening to these logs?
>
>
> ----------
> Repro steps:
> 1) Setup K8's environment as per:
> [https://ci.apache.org/projects/flink/flink-docs-stable/ops/deployment/kubernetes.html]
> 2) Upload jar with code below
> 3) Run jar with no arguments
> 4) Observe that there is no printing of ___TOKEN_LOG_6 or _TOKEN_SOUT_6 in
> the K8's containers or on the UI. There is also no printing of an error.
> {code:java}
> public static void main(String[] args) {
> log.info("_TOKEN_LOG_1");
> System.out.println("_TOKEN_SOUT_1");
> // ExecutionEnvironment env =
> ExecutionEnvironment.getExecutionEnvironment();
> ParameterTool params = ParameterTool.fromArgs(args);
> final ExecutionEnvironment env =
> ExecutionEnvironment.getExecutionEnvironment();
> log.info("_TOKEN_LOG_2");
> System.out.println("_TOKEN_SOUT_2");
> // make parameters available in the web interface
> env.getConfig().setGlobalJobParameters(params);
> // get default test text data
> DataSet<String> text = getTextDataSet(env);
> log.info("_TOKEN_LOG_3");
> System.out.println("_TOKEN_SOUT_3");
> DataSet<Tuple2<String, Integer>> counts =
> // split up the lines in pairs (2-tuples) containing: (word,1)
> text.flatMap(new Tokenizer())
> // group by the tuple field "0" and sum up tuple field "1"
> .groupBy(0)
> .sum(1);
> log.info("_TOKEN_LOG_4");
> System.out.println("_TOKEN_SOUT_4");
> // emit result
> if (params.has("output")) {
> counts.writeAsCsv(params.get("output"), "\n", " ");
> // execute program
> try {
> env.execute("WordCount Example");
> } catch (Exception e) {
> e.printStackTrace();
> log.info("_TOKEN_LOG_ERROR", e);
> System.out.println("_TOKEN_SOUT_ERROR" + e.toString());
> }
> } else {
> log.info("_TOKEN_LOG_5");
> System.out.println("_TOKEN_SOUT_5");
> try {
> counts.print();
> } catch (Exception e) {
> e.printStackTrace();
> log.info("_TOKEN_LOG_ERROR2", e);
> System.out.println("_TOKEN_SOUT_ERROR2" + e.toString());
> }
> log.info("_TOKEN_LOG_6");
> System.out.println("_TOKEN_SOUT_6");
> }
> }
> private static DataSet<String> getTextDataSet(ExecutionEnvironment env) {
> // get default test text data
> return env.fromElements(
> "To be, or not to be,--that is the question:--",
> "Whether 'tis nobler in the mind to suffer",
> "The slings and arrows of outrageous fortune",
> "Or to take arms against a sea of troubles,",
> "And by opposing end them?--To die,--to sleep,--",
> "No more; and by a sleep to say we end",
> "The heartache, and the thousand natural shocks",
> "That flesh is heir to,--'tis a consummation",
> "Devoutly to be wish'd. To die,--to sleep;--",
> "To sleep! perchance to dream:--ay, there's the rub;",
> "For in that sleep of death what dreams may come,",
> "When we have shuffled off this mortal coil,",
> "Must give us pause: there's the respect",
> "That makes calamity of so long life;",
> "For who would bear the whips and scorns of time,",
> "The oppressor's wrong, the proud man's contumely,",
> "The pangs of despis'd love, the law's delay,",
> "The insolence of office, and the spurns",
> "That patient merit of the unworthy takes,",
> "When he himself might his quietus make",
> "With a bare bodkin? who would these fardels bear,",
> "To grunt and sweat under a weary life,",
> "But that the dread of something after death,--",
> "The undiscover'd country, from whose bourn",
> "No traveller returns,--puzzles the will,",
> "And makes us rather bear those ills we have",
> "Than fly to others that we know not of?",
> "Thus conscience does make cowards of us all;",
> "And thus the native hue of resolution",
> "Is sicklied o'er with the pale cast of thought;",
> "And enterprises of great pith and moment,",
> "With this regard, their currents turn awry,",
> "And lose the name of action.--Soft you now!",
> "The fair Ophelia!--Nymph, in thy orisons",
> "Be all my sins remember'd.");
> }{code}
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