[HADOOP-11105] MetricsSystemImpl could leak memory in registered callbacks

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.5.1
• Fix Version/s: 2.6.0
• Component/s: metrics
• Target Version/s: 2.6.0
• Hadoop Flags: Reviewed
• Assignee: Chuan Liu
• Reporter: Chuan Liu
• Created: 18/Sep/14 17:49
• Updated: 01/Dec/14 03:10
• Resolved: 18/Sep/14 22:42

Description

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.

Issue Links

• is related to: HADOOP-11163 MetricsSystemImpl may miss a registered source