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https://issues.apache.org/jira/browse/HADOOP-10642?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Yu resolved HADOOP-10642.
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Resolution: Later
> Provide option to limit heap memory consumed by dynamic metrics2 metrics
> ------------------------------------------------------------------------
>
> Key: HADOOP-10642
> URL: https://issues.apache.org/jira/browse/HADOOP-10642
> Project: Hadoop Common
> Issue Type: Improvement
> Components: metrics
> Reporter: Ted Yu
>
> User sunweiei provided the following jmap output in HBase 0.96 deployment:
> {code}
> num #instances #bytes class name
> ----------------------------------------------
> 1: 14917882 3396492464 [C
> 2: 1996994 2118021808 [B
> 3: 43341650 1733666000 java.util.LinkedHashMap$Entry
> 4: 14453983 1156550896 [Ljava.util.HashMap$Entry;
> 5: 14446577 924580928
> org.apache.hadoop.metrics2.lib.Interns$CacheWith2Keys$2
> {code}
> Heap consumption by Interns$CacheWith2Keys$2 (and indirectly by [C) could be
> due to calls to Interns.info() in DynamicMetricsRegistry which was cloned off
> metrics2/lib/MetricsRegistry.java.
> This scenario would arise when large number of regions are tracked through
> metrics2 dynamically.
> Interns class doesn't provide API to remove entries in its internal Map.
> One solution is to provide an option that allows skipping calls to
> Interns.info() in metrics2/lib/MetricsRegistry.java
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