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https://issues.apache.org/jira/browse/FLINK-10715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16672849#comment-16672849
 ] 

ASF GitHub Bot commented on FLINK-10715:
----------------------------------------

tillrohrmann commented on a change in pull request #6996: [FLINK-10715] Change 
reporter log level
URL: https://github.com/apache/flink/pull/6996#discussion_r230312787
 
 

 ##########
 File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/metrics/MetricRegistryImpl.java
 ##########
 @@ -426,7 +426,12 @@ public void run() {
                        try {
                                reporter.report();
                        } catch (Throwable t) {
-                               LOG.warn("Error while reporting metrics", t);
+                               if (LOG.isDebugEnabled()) {
+                                       LOG.debug("Error while reporting 
metrics {}", t);
+                               }
+                               else {
+                                       LOG.warn("Error while reporting 
metrics", t.getMessage());
 
 Review comment:
   I would actually log this on `info` level since warnings and errors should 
indicate a Flink problem.

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> E2e tests fail with ConcurrentModificationException in MetricRegistryImpl
> -------------------------------------------------------------------------
>
>                 Key: FLINK-10715
>                 URL: https://issues.apache.org/jira/browse/FLINK-10715
>             Project: Flink
>          Issue Type: Bug
>          Components: E2E Tests, Metrics
>    Affects Versions: 1.7.0
>            Reporter: Dawid Wysakowicz
>            Assignee: Igal Shilman
>            Priority: Blocker
>              Labels: pull-request-available
>
> Couple of e2e tests that rely on metrics fail with exception:
> {code}
> 2018-10-29 11:40:32,781 WARN  
> org.apache.flink.runtime.metrics.MetricRegistryImpl           - Error while 
> reporting metrics
> java.util.ConcurrentModificationException
>       at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)
>       at java.util.HashMap$EntryIterator.next(HashMap.java:1471)
>       at java.util.HashMap$EntryIterator.next(HashMap.java:1469)
>       at 
> org.apache.flink.metrics.slf4j.Slf4jReporter.report(Slf4jReporter.java:101)
>       at 
> org.apache.flink.runtime.metrics.MetricRegistryImpl$ReporterTask.run(MetricRegistryImpl.java:427)
>       at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>       at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
>       at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
>       at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>       at java.lang.Thread.run(Thread.java:748)
> {code}
> Tests that failed:
> *  'Resuming Externalized Checkpoint (file, sync, no parallelism change) 
> end-to-end test
> * 'State TTL Heap backend end-to-end test'



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