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From Scott <sct...@gmail.com>
Subject Accumulo Monitor NullPointerException
Date Fri, 21 Aug 2015 22:15:26 GMT
Hello,

  We have Accumulo 1.6.3 set up on the HortonWorks install with a basic
cluster of one master and one tablet server. Initially everything seemed
good but now I'm getting a NullPointerException when I go to the monitor
web page. The logs also keep adding a message to that effect as well. I
searched and couldn't find any posts with the same problem. I went back
through all of the config files and made sure they conform to the
configuration instructions. I'm hoping someone can point me to the right
place to look for troubleshooting.

http://<machine-name>:50095 responds with a page that has the following:

<pre>
java.lang.NullPointerException
at org.apache.accumulo.monitor.Monitor.fetchData(Monitor.java:252)
at
org.apache.accumulo.monitor.servlets.BasicServlet.doGet(BasicServlet.java:59)
at
org.apache.accumulo.monitor.servlets.DefaultServlet.doGet(DefaultServlet.java:101)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
at
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:503)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
at
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
at
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429)
at
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
at
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:370)
at
org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
at
org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)
at
org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
at
org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at
org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
at
org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Thread.java:745)
</pre>


The logs are recording the following error:

2015-08-21 16:37:21,152 [monitor.Monitor] WARN :
java.lang.NullPointerException
        at org.apache.accumulo.monitor.Monitor.fetchData(Monitor.java:252)
        at org.apache.accumulo.monitor.Monitor$2.run(Monitor.java:508)
        at
org.apache.accumulo.core.util.LoggingRunnable.run(LoggingRunnable.java:34)
        at java.lang.Thread.run(Thread.java:745)

Thanks,

 Scott

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