[HDDS-11100] OM/SCM Metrics support displaying Netty off-heap memory.

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Implemented
• Affects Version/s: 1.4.1
• Fix Version/s: 2.0.0
• Component/s: OM, SCM
• Labels: pull-request-available
• Assignee: Shilun Fan
• Reporter: Shilun Fan
• Created: 04/Jul/24 21:16
• Updated: 12/Jul/24 23:54
• Resolved: 12/Jul/24 16:11

Description

During a recent period, our cluster's DataNode (DN) exhibited high off-heap memory utilization, triggering frequent system.gc() calls. Upon reading relevant GC logs, we observed normal heap memory usage and monitored heap metrics. It became apparent that off-heap memory usage might be causing the system.gc() calls. We identified that DataNode can display off-heap memory usage, which indirectly helped us infer potential off-heap memory overflow. In HDDS-9070, we now support displaying Netty off-heap memory usage on DataNode, facilitating off-heap memory monitoring. Similarly, we can display Netty off-heap memory usage on OM and SCM.

Issue Links

• links to: GitHub Pull Request #6900