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https://issues.apache.org/jira/browse/HDDS-7349?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Attila Doroszlai resolved HDDS-7349.
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Fix Version/s: 1.4.0
Resolution: Fixed
> Flaky integration test have memory leak for RatisDropwizardExports
> ------------------------------------------------------------------
>
> Key: HDDS-7349
> URL: https://issues.apache.org/jira/browse/HDDS-7349
> Project: Apache Ozone
> Issue Type: Bug
> Reporter: Sumit Agrawal
> Assignee: Sumit Agrawal
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.4.0
>
> Attachments: 3858_review.patch, 3858_review2.patch,
> MetricRegistries.patch
>
>
> Memory leak observed in flaky integration test causing OutOfMemory multiple
> times, and causing the cancel of the case.
> 1. registeration of RatisDropwizardExports is done multiple time, even its
> registered.
> -- This is called by Ratis CopyOnWrite when another metrics get registered.
> -- Since the track of above object is lost, no way to cleanup later
> {code}
> ------------------stack showing registeration-----------
> at
> io.prometheus.client.CollectorRegistry.register(Lio/prometheus/client/Collector;)V
> (CollectorRegistry.java:60)
> at
> org.apache.hadoop.hdds.server.http.RatisDropwizardExports.registerDropwizard(Lorg/apache/ratis/metrics/RatisMetricRegistry;Ljava/util/Map;)V
> (RatisDropwizardExports.java:75)
> at
> org.apache.hadoop.hdds.server.http.RatisDropwizardExports.lambda$registerRatisMetricReporters$0(Ljava/util/Map;Lorg/apache/ratis/metrics/RatisMetricRegistry;)V
> (RatisDropwizardExports.java:53)
> at
> org.apache.hadoop.hdds.server.http.RatisDropwizardExports$$Lambda$384.accept(Ljava/lang/Object;)V
> (Unknown Source)
> at
> org.apache.ratis.metrics.impl.MetricRegistriesImpl.lambda$null$0(Lorg/apache/ratis/metrics/RatisMetricRegistry;Ljava/util/function/Consumer;)V
> (MetricRegistriesImpl.java:72)
> at
> org.apache.ratis.metrics.impl.MetricRegistriesImpl$$Lambda$618.accept(Ljava/lang/Object;)V
> (Unknown Source)
> at
> java.util.concurrent.CopyOnWriteArrayList.forEach(Ljava/util/function/Consumer;)V
> (CopyOnWriteArrayList.java:895)
> at
> org.apache.ratis.metrics.impl.MetricRegistriesImpl.lambda$create$1(Lorg/apache/ratis/metrics/MetricRegistryInfo;)Lorg/apache/ratis/metrics/RatisMetricRegistry;
> (MetricRegistriesImpl.java:72)
> ------------------------------------
> {code}
> 2. after stop of Datanode, still ratis registeration going on causing to get
> accumulated.
> This is observed that Datanode is stopped, but still Datanode having
> "ratisMetricsMap" having new metrics registered.
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