[HADOOP-13135] Encounter response code 500 when accessing /metrics endpoint

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.7.1
• Labels: metrics
• Assignee: Unassigned
• Reporter: Ted Yu
• Created: 11/May/16 22:30
• Updated: 26/Feb/17 17:41

Description

When accessing /metrics endpoint on hbase master through hadoop 2.7.1, I got:

HTTP ERROR 500

Problem accessing /metrics. Reason:

    INTERNAL_SERVER_ERROR
Caused by:

java.lang.NullPointerException
	at org.apache.hadoop.http.HttpServer2.isInstrumentationAccessAllowed(HttpServer2.java:1029)
	at org.apache.hadoop.metrics.MetricsServlet.doGet(MetricsServlet.java:109)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1221)
	at org.apache.hadoop.hbase.http.lib.StaticUserWebFilter$StaticUserFilter.doFilter(StaticUserWebFilter.java:113)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)

ajisakaa suggested that code 500 should be 404 (NOT FOUND).