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https://issues.apache.org/jira/browse/HADOOP-13135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15322830#comment-15322830
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Jeremy Carroll commented on HADOOP-13135:
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I encountered this issue this morning. Only happen with HBase (1.2.1 - Stable).
> Encounter response code 500 when accessing /metrics endpoint
> ------------------------------------------------------------
>
> Key: HADOOP-13135
> URL: https://issues.apache.org/jira/browse/HADOOP-13135
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.7.1
> Reporter: Ted Yu
>
> When accessing /metrics endpoint on hbase master through hadoop 2.7.1, I got:
> {code}
> 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)
> {code}
> [~ajisakaa] suggested that code 500 should be 404 (NOT FOUND).
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