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https://issues.apache.org/jira/browse/FLINK-24497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17429034#comment-17429034
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Preston Price commented on FLINK-24497:
---------------------------------------
It looks like this new metric "records-lag" was introduced recently here:
[https://github.com/apache/flink/pull/16838]
But I have not fully groked the change there to understand its purpose, or
exactly why this error is surfacing.
Some quick debugging on my side shows that the `Map<MetricName, ? extends
Metric> metrics` contains metrics with the expected group
`CONSUMER_FETCH_MANAGER_GROUP`, but no metrics with the expected name
`records-lag`. This causes the call to `MetricUtil.getKafkaMetric(metrics,
filter)` to throw the exception because it expects to get at least one match
via the `orElseThrow` statement.
This leads me to believe this is a cold-start problem where the absence/initial
calculation of this metric is not handled gracefully.
I am hoping there is a graceful way to mute these exceptions as they are
prolific, and clogging up my output.
> Kafka metrics fetching throws IllegalStateException
> ----------------------------------------------------
>
> Key: FLINK-24497
> URL: https://issues.apache.org/jira/browse/FLINK-24497
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka
> Reporter: Juha
> Priority: Minor
> Fix For: 1.14.0
>
>
> I have a simple job that just consumes from a single Kafka topic, performs
> some filtering and produces to another topic.
> The TaskManager log has these periodically. This is a new problem in 1.14.0,
> the same setup didn't have the issue when using 1.13.0 or 1.13.2.
> {code}
> 2021-10-05T15:22:31.928316 [2021-10-05 15:22:31,927] WARN Error when getting
> Kafka consumer metric "records-lag" for partition "cpu.kafka-1". Metric
> "pendingBytes" may not be reported correctly.
> (org.apache.flink.connector.kafka.source.metrics.KafkaSourceReaderMetrics:306)
> 2021-10-05T15:22:31.928316 java.lang.IllegalStateException: Cannot find
> Kafka metric matching current filter.
> 2021-10-05T15:22:31.928316 at
> org.apache.flink.connector.kafka.MetricUtil.lambda$getKafkaMetric$1(MetricUtil.java:63)
> ~[flink-connector-kafka_2.12-1.14.0.jar:1.14.0]
> 2021-10-05T15:22:31.928316 at
> java.util.Optional.orElseThrow(Optional.java:408) ~[?:?]
> 2021-10-05T15:22:31.928316 at
> org.apache.flink.connector.kafka.MetricUtil.getKafkaMetric(MetricUtil.java:61)
> ~[flink-connector-kafka_2.12-1.14.0.jar:1.14.0]
> 2021-10-05T15:22:31.928316 at
> org.apache.flink.connector.kafka.source.metrics.KafkaSourceReaderMetrics.getRecordsLagMetric(KafkaSourceReaderMetrics.java:304)
> ~[flink-connector-kafka_2.12-1.14.0.jar:1.14.0]
> 2021-10-05T15:22:31.928316 at
> org.apache.flink.connector.kafka.source.metrics.KafkaSourceReaderMetrics.lambda$maybeAddRecordsLagMetric$4(KafkaSourceReaderMetrics.java:229)
> ~[flink-connector-kafka_2.12-1.14.0.jar:1.14.0]
> 2021-10-05T15:22:31.928316 at
> java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1705)
> [?:?]
> 2021-10-05T15:22:31.928316 at
> org.apache.flink.connector.kafka.source.metrics.KafkaSourceReaderMetrics.maybeAddRecordsLagMetric(KafkaSourceReaderMetrics.java:228)
> [flink-connector-kafka_2.12-1.14.0.jar:1.14.0]
> 2021-10-05T15:22:31.928316 at
> org.apache.flink.connector.kafka.source.reader.KafkaPartitionSplitReader.fetch(KafkaPartitionSplitReader.java:187)
> [flink-connector-kafka_2.12-1.14.0.jar:1.14.0]
> 2021-10-05T15:22:31.928316 at
> org.apache.flink.connector.base.source.reader.fetcher.FetchTask.run(FetchTask.java:58)
> [flink-table_2.12-1.14.0.jar:1.14.0]
> 2021-10-05T15:22:31.928316 at
> org.apache.flink.connector.base.source.reader.fetcher.SplitFetcher.runOnce(SplitFetcher.java:142)
> [flink-table_2.12-1.14.0.jar:1.14.0]
> 2021-10-05T15:22:31.928316 at
> org.apache.flink.connector.base.source.reader.fetcher.SplitFetcher.run(SplitFetcher.java:105)
> [flink-table_2.12-1.14.0.jar:1.14.0]
> 2021-10-05T15:22:31.928316 at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?]
> 2021-10-05T15:22:31.928316 at
> java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
> 2021-10-05T15:22:31.928316 at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
> [?:?]
> 2021-10-05T15:22:31.928316 at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
> [?:?]
> 2021-10-05T15:22:31.928316 at java.lang.Thread.run(Thread.java:829) [?:?]
> {code}
> Regards,
> Juha
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