Ted Yu created HBASE-11267:
------------------------------
Summary: Dynamic metrics2 metrics may consume large amount of heap
memory
Key: HBASE-11267
URL: https://issues.apache.org/jira/browse/HBASE-11267
Project: HBase
Issue Type: Bug
Reporter: Ted Yu
User sunweiei provided the following jmap output in 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 could be due to calls to
Interns.info() in DynamicMetricsRegistry.
This scenario would arise when large number of regions are tracked through
metrics2.
Interns class doesn't provide API to remove entries in its internal Map.
Meaning, DynamicMetricsRegistry#clearMetrics() is unable to reclaim that part
of heap.
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