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https://issues.apache.org/jira/browse/HBASE-19424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16277843#comment-16277843
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Appy commented on HBASE-19424:
------------------------------
Digging around, we should probably set CONF_CONTEXT_ATTRIBUTE attribute in our
[HttpServer
here|https://github.com/apache/hbase/blob/master/hbase-http/src/main/java/org/apache/hadoop/hbase/http/HttpServer.java#L590]
like [hadoop
does|https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/HttpServer2.java#L620].
That's because, isInstrumentationAccessAllowed(...) looks for it, and when it
returns nothing, conf becomes null and throws NullPointerException.
{noformat}
Configuration conf =
(Configuration) servletContext.getAttribute(CONF_CONTEXT_ATTRIBUTE);
boolean access = true;
boolean adminAccess = conf.getBoolean(
CommonConfigurationKeys.HADOOP_SECURITY_INSTRUMENTATION_REQUIRES_ADMIN,
false);
if (adminAccess) {
access = hasAdministratorAccess(servletContext, request, response);
}
{noformat}
> Metrics servlet doesn't work
> ----------------------------
>
> 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
> Priority: Minor
> Fix For: 1.4.1, 1.5.0
>
>
> 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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