spoon-lz opened a new issue, #2123: URL: https://github.com/apache/fluss/issues/2123
### Search before asking - [x] I searched in the [issues](https://github.com/apache/fluss/issues) and found nothing similar. ### Fluss version main (development) ### Please describe the bug 🐞 Error log when read from fluss: `2025-12-03 17:35:14,660 [Source: cayde_test_fluss_1202_t2[1] (1/1)#77] WARN org.apache.flink.metrics.prometheus.PrometheusReporter - There was a problem registering metric bytesPerRequest. java.lang.NullPointerException: Cannot invoke "org.apache.flink.metrics.HistogramStatistics.getMin()" because "statistics" is null at org.apache.flink.metrics.prometheus.AbstractPrometheusReporter$HistogramSummaryProxy.addSamples(AbstractPrometheusReporter.java:404) at org.apache.flink.metrics.prometheus.AbstractPrometheusReporter$HistogramSummaryProxy.collect(AbstractPrometheusReporter.java:369) at io.prometheus.client.CollectorRegistry.collectorNames(CollectorRegistry.java:100) at io.prometheus.client.CollectorRegistry.register(CollectorRegistry.java:50) at io.prometheus.client.Collector.register(Collector.java:139) at org.apache.flink.metrics.prometheus.AbstractPrometheusReporter.notifyOfAddedMetric(AbstractPrometheusReporter.java:155) at org.apache.flink.runtime.metrics.MetricRegistryImpl.forAllReporters(MetricRegistryImpl.java:475) at org.apache.flink.runtime.metrics.MetricRegistryImpl.register(MetricRegistryImpl.java:395) at org.apache.flink.runtime.metrics.groups.AbstractMetricGroup.addMetric(AbstractMetricGroup.java:421) at org.apache.flink.runtime.metrics.groups.AbstractMetricGroup.histogram(AbstractMetricGroup.java:374) at org.apache.fluss.flink.metrics.FlinkMetricRegistry.registerMetric(FlinkMetricRegistry.java:128) at org.apache.fluss.flink.metrics.FlinkMetricRegistry.register(FlinkMetricRegistry.java:88) at org.apache.fluss.metrics.groups.AbstractMetricGroup.addMetric(AbstractMetricGroup.java:298) at org.apache.fluss.metrics.groups.AbstractMetricGroup.histogram(AbstractMetricGroup.java:250) at org.apache.fluss.client.metrics.ScannerMetricGroup.<init>(ScannerMetricGroup.java:76) at org.apache.fluss.client.table.scanner.log.LogScannerImpl.<init>(LogScannerImpl.java:94) at org.apache.fluss.client.table.scanner.TableScan.createLogScanner(TableScan.java:106) at org.apache.fluss.flink.source.reader.FlinkSourceSplitReader.<init>(FlinkSourceSplitReader.java:135) at org.apache.fluss.flink.source.reader.FlinkSourceReader.lambda$new$0(FlinkSourceReader.java:69) at org.apache.flink.connector.base.source.reader.fetcher.SplitFetcherManager.createSplitFetcher(SplitFetcherManager.java:196) at org.apache.flink.connector.base.source.reader.fetcher.SingleThreadFetcherManager.addSplits(SingleThreadFetcherManager.java:107) at org.apache.flink.connector.base.source.reader.SourceReaderBase.addSplits(SourceReaderBase.java:242) at org.apache.flink.streaming.api.operators.SourceOperator.open(SourceOperator.java:349) at org.apache.flink.streaming.runtime.tasks.RegularOperatorChain.initializeStateAndOpenOperators(RegularOperatorChain.java:107) at org.apache.flink.streaming.runtime.tasks.StreamTask.restoreGates(StreamTask.java:740) at org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.call(StreamTaskActionExecutor.java:55) at org.apache.flink.streaming.runtime.tasks.StreamTask.restoreInternal(StreamTask.java:715) at org.apache.flink.streaming.runtime.tasks.StreamTask.restore(StreamTask.java:681) at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:962) at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:928) at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:750) at org.apache.flink.runtime.taskmanager.Task.run(Task.java:564) at java.base/java.lang.Thread.run(Thread.java:833)` ### Solution FlinkHistogram#getStatistics() just return null ,a correct result needs to be return. ### Are you willing to submit a PR? - [x] I'm willing to submit a PR! -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
