[HDFS-15668] RBF: Fix RouterRPCMetrics annocation and document misplaced error

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.3.0, 3.2.1, 3.1.4
• Fix Version/s: 3.4.0
• Component/s: documentation
• Assignee: Hongbing Wang
• Reporter: Hongbing Wang
• Created: 05/Nov/20 06:48
• Updated: 10/Nov/20 05:13
• Resolved: 10/Nov/20 05:12

Description

I found that the description of the two fields: ProxyOpFailureStandby and ProxyOpFailureCommunicate in the website may be misplaced. 

When I reviewed the code to see the meaning of the two fields, I found that their descriptions were indeed misplaced.

Origin code：

@Metric("Number of operations to fail to reach NN")
private MutableCounterLong proxyOpFailureStandby;
@Metric("Number of operations to hit a standby NN")
private MutableCounterLong proxyOpFailureCommunicate;

They should be:

@Metric("Number of operations to hit a standby NN")
private MutableCounterLong proxyOpFailureStandby;
@Metric("Number of operations to fail to reach NN")
private MutableCounterLong proxyOpFailureCommunicate;