Chuan Liu created HADOOP-11105:
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Summary: MetricsSystemImpl could leak memory in registered
callbacks
Key: HADOOP-11105
URL: https://issues.apache.org/jira/browse/HADOOP-11105
Project: Hadoop Common
Issue Type: Bug
Affects Versions: 3.0.0
Reporter: Chuan Liu
Assignee: Chuan Liu
In {{MetricsSystemImpl.register(final String name, final String description,
final T sink)}} method, we will also add a callback function to the
{{callbacks}} array list. However, upon unregistering, the callback function is
not removed from the list in existing code. As a result, the memory allocated
for the callback function could accumulate in the {{MetricsSystemImpl}} list.
In one of our cluster, we have seen a case where there are about 874 MB memory
retained by {{MetricsSystemImpl}}.
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