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https://issues.apache.org/jira/browse/KAFKA-6787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16474473#comment-16474473
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Manikumar commented on KAFKA-6787:
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This might have fixed in KAFKA-6870.
> enumerate SampledStat.samples got null item
> -------------------------------------------
>
> Key: KAFKA-6787
> URL: https://issues.apache.org/jira/browse/KAFKA-6787
> Project: Kafka
> Issue Type: Bug
> Components: metrics
> Affects Versions: 1.1.0
> Reporter: Qiang Zhao
> Priority: Critical
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> {code}
> java.lang.NullPointerException at
> org.apache.kafka.common.metrics.stats.SampledStat.purgeObsoleteSamples(SampledStat.java:104)
> at
> org.apache.kafka.common.metrics.stats.SampledStat.measure(SampledStat.java:74)
> at
> org.apache.kafka.common.metrics.KafkaMetric.metricValue(KafkaMetric.java:68)
> at kafka.api.QuotaTestClients$.metricValue(BaseQuotaTest.scala:163) at
> kafka.api.QuotaTestClients.produceUntilThrottled(BaseQuotaTest.scala:193) at
> kafka.api.BaseQuotaTest.testThrottledProducerConsumer(BaseQuotaTest.scala:84)
> {code}
> {code:java}
> protected void purgeObsoleteSamples(MetricConfig config, long now) {
> long expireAge = config.samples() * config.timeWindowMs();
> for (Sample sample : samples) {
> if (now - sample.lastWindowMs >= expireAge) // line 104, sample
> is null, probably is a concurrent issue
> sample.reset(now);
> }
> }
> {code}
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