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HADOOP-7704. Reduce number of object created by JMXJsonServlet.

Browse Source 
(Devaraj K via Eric Yang)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1179287 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Eric Yang 2011-10-05 16:09:27 +00:00
parent c90d7d649b
commit 9b6671dc29
2 changed files with 40 additions and 42 deletions
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3
hadoop-common-project/hadoop-common/CHANGES.txt
View File

@ -48,6 +48,9 @@ Trunk (unreleased changes)
HADOOP-7703. Improved excpetion handling of shutting down web server.
(Devaraj K via Eric Yang)
HADOOP-7704. Reduce number of object created by JMXJsonServlet.
(Devaraj K via Eric Yang)
Release 0.23.0 - Unreleased
INCOMPATIBLE CHANGES

31
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/jmx/JMXJsonServlet.java
View File

@ -117,13 +117,15 @@ public class JMXJsonServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
// ----------------------------------------------------- Instance Variables
/**
* MBean server.
*/
protected transient MBeanServer mBeanServer = null;
protected transient MBeanServer mBeanServer;
// --------------------------------------------------------- Public Methods
/**
* Json Factory to create Json generators for write objects in json format
*/
protected transient JsonFactory jsonFactory;
/**
* Initialize this servlet.
*/
@ -131,6 +133,7 @@ public class JMXJsonServlet extends HttpServlet {
public void init() throws ServletException {
// Retrieve the MBean server
mBeanServer = ManagementFactory.getPlatformMBeanServer();
jsonFactory = new JsonFactory();
}
/**
@ -149,23 +152,14 @@ public void doGet(HttpServletRequest request, HttpServletResponse response) {
response)) {
return;
}
JsonGenerator jg = null;
try {
response.setContentType("application/json; charset=utf8");
PrintWriter writer = response.getWriter();
JsonFactory jsonFactory = new JsonFactory();
JsonGenerator jg = jsonFactory.createJsonGenerator(writer);
jg = jsonFactory.createJsonGenerator(writer);
jg.useDefaultPrettyPrinter();
jg.writeStartObject();
if (mBeanServer == null) {
jg.writeStringField("result", "ERROR");
jg.writeStringField("message", "No MBeanServer could be found");
jg.close();
LOG.error("No MBeanServer could be found.");
response.setStatus(HttpServletResponse.SC_NOT_FOUND);
return;
}
// query per mbean attribute
String getmethod = request.getParameter("get");
@ -174,13 +168,11 @@ public void doGet(HttpServletRequest request, HttpServletResponse response) {
if (splitStrings.length != 2) {
jg.writeStringField("result", "ERROR");
jg.writeStringField("message", "query format is not as expected.");
jg.close();
response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
return;
}
listBeans(jg, new ObjectName(splitStrings[0]), splitStrings[1],
response);
jg.close();
return;
}
@ -190,8 +182,11 @@ public void doGet(HttpServletRequest request, HttpServletResponse response) {
qry = "*:*";
}
listBeans(jg, new ObjectName(qry), null, response);
} finally {
if (jg != null) {
jg.close();
}
}
} catch (IOException e) {
LOG.error("Caught an exception while processing JMX request", e);
response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);