Ted Yu created HADOOP-10642:
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Summary: 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
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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