secondary namenode web interface

[Yuri Pradkin]

Hi,

I'm running Hadoop (latest snapshot) on several machines and in our setup 
namenode 
and secondarynamenode are on different systems.  I see from the logs than 
secondary
namenode regularly checkpoints fs from primary namenode.

But when I go to the secondary namenode HTTP (dfs.secondary.http.address) in
my browser I see something like this:

        HTTP ERROR: 500
        init
        RequestURI=/dfshealth.jsp
        Powered by Jetty://

And in secondary's log I find these lines:

2008-04-02 11:26:25,357 WARN /: /dfshealth.jsp:
java.lang.NullPointerException
        at org.apache.hadoop.dfs.dfshealth_jsp.<init>(dfshealth_jsp.java:21)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at 
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
        at 
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:539)
        at java.lang.Class.newInstance0(Class.java:373)
        at java.lang.Class.newInstance(Class.java:326)
        at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:199)
        at 
org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:326)
        at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:405)
        at 
org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:475)
        at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
        at org.mortbay.http.HttpContext.handle(HttpContext.java:1565)
        at 
org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:635)
        at org.mortbay.http.HttpContext.handle(HttpContext.java:1517)
        at org.mortbay.http.HttpServer.service(HttpServer.java:954)
        at org.mortbay.http.HttpConnection.service(HttpConnection.java:814)
        at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:981)
        at org.mortbay.http.HttpConnection.handle(HttpConnection.java:831)
        at 
org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
        at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
        at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)

Is something missing from my configuration?  Anybody else seen these?

Thanks,

  -Yuri