[HDFS-5144] Document time unit to NameNodeMetrics.java

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.1.0-beta
• Fix Version/s: 2.3.0
• Component/s: documentation
• Labels: newbie
• Hadoop Flags: Reviewed
• Assignee: Akira Ajisaka
• Reporter: Akira Ajisaka
• Created: 29/Aug/13 23:36
• Updated: 24/Feb/14 20:57
• Resolved: 30/Aug/13 08:05

Description

in o.a.h.hdfs.server.namenode.metrics.NameNodeMetrics.java, metrics are declared as follows:

  @Metric("Duration in SafeMode at startup") MutableGaugeInt safeModeTime;
  @Metric("Time loading FS Image at startup") MutableGaugeInt fsImageLoadTime;

Since some users may confuse which unit (sec or msec) is correct, they should be documented.

Issue Links

• is related to: HADOOP-9913 Document time unit to RpcMetrics.java