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https://issues.apache.org/jira/browse/HDFS-7377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14202034#comment-14202034
]
Brahma Reddy Battula commented on HDFS-7377:
--------------------------------------------
As format will come as null when we access from http://<DN_IP>:<http
port>/dataNodeHome.jsp, resonse will be null...Please check the following code
for same..
{code}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
if (!HttpServer2.isInstrumentationAccessAllowed(getServletContext(),
request, response)) {
return;
}
String format = request.getParameter("format");
Collection<MetricsContext> allContexts =
ContextFactory.getFactory().getAllContexts();
if ("json".equals(format)) {
response.setContentType("application/json; charset=utf-8");
PrintWriter out = response.getWriter();
try {
// Uses Jetty's built-in JSON support to convert the map into JSON.
out.print(new JSON().toJSON(makeMap(allContexts)));
} finally {
out.close();
}
} else {
PrintWriter out = response.getWriter();
try {
printMap(out, makeMap(allContexts));
} finally {
out.close();
}
}
}
{code}
can we add like blow..as we are handling the json format...
{code}
if (null == format) {
format = FORMAT_JSON;
}
{code}
> [ DataNode Web UI ] Metric page will not display anything..
> -----------------------------------------------------------
>
> Key: HDFS-7377
> URL: https://issues.apache.org/jira/browse/HDFS-7377
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Brahma Reddy Battula
> Priority: Critical
>
> Scenario :
> ======
> Go to http://<DN_IP>:<http port>/dataNodeHome.jsp
> and click on metrics link..
> we will not able to see any thing..
> Did not find reason..do we need to implent metric page..?
> Checked the HDFS-2933,but did not find any clue...
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