[HDFS-10190] Add DN FSDatasetImpl lock metrics

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.8.0
• Component/s: datanode, performance
• Assignee: John Zhuge
• Reporter: John Zhuge
• Created: 22/Mar/16 04:22
• Updated: 22/Mar/16 14:59

Description

Add DN FSDatasetImpl lock metrics:

• Number of lock calls
• Contention rate
• Average wait time

Locks of interest:

• FsDatasetImpl intrinsic lock
• FsDatasetImpl.statsLock