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https://issues.apache.org/jira/browse/HBASE-19424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16317343#comment-16317343
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Hudson commented on HBASE-19424:
--------------------------------
SUCCESS: Integrated in Jenkins build HBase-1.2-IT #1057 (See
[https://builds.apache.org/job/HBase-1.2-IT/1057/])
HBASE-19424 Fix NPE in "/metrics" servlet. (appy: rev
eb77f0603c18abf7fb2026e52bed22a8fa46ce1e)
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/http/HttpServer.java
> 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-2
>
> 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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