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https://issues.apache.org/jira/browse/HBASE-19424?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gavin updated HBASE-19424:
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Comment: was deleted
(was: A comment with security level 'jira-users' was removed.)
> Metrics servlet throws NPE
> --------------------------
>
> Key: HBASE-19424
> URL: https://issues.apache.org/jira/browse/HBASE-19424
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.4.0
> Reporter: Andrew Purtell
> Assignee: Toshihiro Suzuki
> Priority: Minor
> Fix For: 1.3.2, 1.4.1, 1.5.0, 1.2.7, 2.0.0-beta-1, 2.0.0
>
> Attachments: HBASE-19424.branch-1.patch
>
>
> In branch-1 at least we put up a servlet on "/metrics" that is Hadoop's
> MetricsServlet. However HBase users are expected to pick up metrics via
> "/jmx". We don't mention "/metrics" or link to it on the UI. If you attempt
> to access "/metrics" with head of branch-1 it errors out due to a NPE
> {noformat}
> 2017-12-04 16:06:37,403 ERROR [1874557409@qtp-1910896157-3] mortbay.log:
> /metrics
> java.lang.NullPointerException
> at
> org.apache.hadoop.http.HttpServer2.isInstrumentationAccessAllowed(HttpServer2.java:1049)
> at
> org.apache.hadoop.metrics.MetricsServlet.doGet(MetricsServlet.java:109)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
> {noformat}
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