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https://issues.apache.org/jira/browse/IGNITE-12769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17061788#comment-17061788
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Andrey N. Gura commented on IGNITE-12769:
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[~nizhikov] {{MetricRegistry}} still allows to remove any metrics. If somebody
remove histogram metric {{histrogramNames}} caches will still contain key-value
pair for removed histogram.
I don't see any reason for {{histogramNames}} cache at all. For
{{MetricRegistryMBean}} each invocation of {{getAttribute}} attribute method
will still produce garbage which is comparable with concatenation of metric
name and bounds.
If we remove this cache we will also fix IGNITE-12767 automatically. Moreover,
we will fix design problem where {{MetricUtils}} is responsible for histogram
metric name representation instead of corresponding exporter.
> MetricRegistryMBean and OpenCensusExporterSpi have memory leak
> --------------------------------------------------------------
>
> Key: IGNITE-12769
> URL: https://issues.apache.org/jira/browse/IGNITE-12769
> Project: Ignite
> Issue Type: Bug
> Reporter: Andrey N. Gura
> Assignee: Nikolay Izhikov
> Priority: Major
> Fix For: 2.8.1
>
>
> {{MetricRegistryMBean}} and {{OpenCensusExporterSpi}} have memory leak.
> To the following maps values add but never remove (i.e. on remove
> corresponding histogram or on change histogram buckets layout):
> * {{MetricRegistryMBean.histogramNames}}
> * {{OpenCensusMetricExporterSpi.histogramNames}}
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