[HADOOP-6920] Metrics2: metrics instrumentation

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.23.0
• Hadoop Flags: Incompatible change, Reviewed

Release Note

Metrics names are standardized to use CapitalizedCamelCase. Some examples of this is:
# Metrics names using "_" is changed to new naming scheme. Eg: bytes_written changes to BytesWritten.
# All metrics names start with capitals. Example: threadsBlocked changes to ThreadsBlocked.

• Tags: metrics2
• Assignee: Luke Lu
• Reporter: Luke Lu
• Created: 23/Aug/10 21:00
• Updated: 15/Nov/11 00:50
• Resolved: 11/May/11 00:16

Description

The jira tracks the metrics instrumentation for the new framework, i.e., porting jvm and rpc metrics to the new framework.

This issue (esp. the "incompatible change flag") depends on the outcome of the discussion (proposed in HADOOP-6728) on whether we should support backward compatibility (at some cost.)

Issue Links

• incorporates: HADOOP-7055 Update of commons logging libraries causes EventCounter to count logging events incorrectly
• incorporates: HADOOP-6887 Need a separate metrics per garbage collector
• is blocked by: HADOOP-6919 Metrics2: metrics framework
• is required by: HADOOP-6918 Make metrics naming consistent