Devaraj K created YARN-887:
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Summary: WebAppProxyServlet should not create HttpClient object
for each request
Key: YARN-887
URL: https://issues.apache.org/jira/browse/YARN-887
Project: Hadoop YARN
Issue Type: Bug
Components: resourcemanager
Affects Versions: 3.0.0, 2.1.0-beta
Reporter: Devaraj K
Assignee: Devaraj K
{code:xml}
private static void proxyLink(HttpServletRequest req,
HttpServletResponse resp, URI link, Cookie c, String proxyHost)
throws IOException {
org.apache.commons.httpclient.URI uri =
new org.apache.commons.httpclient.URI(link.toString(), false);
HttpClientParams params = new HttpClientParams();
params.setCookiePolicy(CookiePolicy.BROWSER_COMPATIBILITY);
params.setBooleanParameter(HttpClientParams.ALLOW_CIRCULAR_REDIRECTS, true);
HttpClient client = new HttpClient(params);
{code}
WebAppProxyServlet is creating HttpClient object for every request. If we have
multiple Jobs running with many tasks, if we want to get the report/monitor
these through web, webproxy server is opening many files and it is causing too
many files open error.
This can be avoided by having one HttpClient object with
MultiThreadedHttpConnectionManager and use the same for all requests which
avoids to open many files.
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