Proxies can cache some of the Hadoop servlet/JSP pages
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Key: HADOOP-6607
URL: https://issues.apache.org/jira/browse/HADOOP-6607
Project: Hadoop Common
Issue Type: Bug
Components: io
Affects Versions: 0.22.0
Reporter: Steve Loughran
Priority: Minor
I'm suffering from proxy servers that are caching some of the HttpResponses
that Hadoop generates in servlets/JSP pages. While the web ui is up to date,
some of my build files are failing to pull stuff down because that is going via
proxy -it sees an error page rather than the data
# Every servlet should set a short expires header and disable caching,
especially in proxies.
# JSP pages should do it to
# It's essential that error responses do it.
Maybe this could be done in a filter. Otherwise something like
{code}
/**
* Turn off caching and say that the response expires now
* @param response the response
*/
protected void disableCaching(HttpServletResponse response) {
response.addDateHeader("Expires", System.currentTimeMillis());
response.addHeader("Cache-Control", "no-cache");
response.addHeader("Pragma", "no-cache");
}
{code}
Before anyone rushes to do this, we should consult some HTTP experts in Yahoo!
or Facebook to get the options right. It may be best to have, say, a 1s
lifespan on everything.
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