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From "Aaron T. Myers (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2724) NN web UI can throw NPE after startup, before standby state is entered
Date Tue, 27 Dec 2011 06:06:31 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13176096#comment-13176096
] 

Aaron T. Myers commented on HDFS-2724:
--------------------------------------

Specifically, the error is:

{noformat}
11/12/26 14:51:08 ERROR mortbay.log: /dfshealth.jsp
java.lang.NullPointerException
  at org.apache.hadoop.hdfs.server.namenode.NameNode.getServiceState(NameNode.java:920)
  at org.apache.hadoop.hdfs.server.namenode.dfshealth_jsp._jspService(dfshealth_jsp.java:72)
  at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
  at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
  at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1221)
  at org.apache.hadoop.http.lib.StaticUserWebFilter$StaticUserFilter.doFilter(StaticUserWebFilter.java:109)
  at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
  at org.apache.hadoop.http.HttpServer$QuotingInputFilter.doFilter(HttpServer.java:988)
  at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
  at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
  at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
  at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
  at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
  at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
  at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
  at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
  at org.mortbay.jetty.Server.handle(Server.java:326)
  at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
  at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)
  at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
  at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
  at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
  at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
  at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
{noformat}
                
> NN web UI can throw NPE after startup, before standby state is entered
> ----------------------------------------------------------------------
>
>                 Key: HDFS-2724
>                 URL: https://issues.apache.org/jira/browse/HDFS-2724
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Aaron T. Myers
>            Assignee: Eli Collins
>
> There's a brief period of time (a few seconds) after the NN web server has been initialized,
but before the NN's HA state is initialized. If {{dfshealth.jsp}} is hit during this time,
a {{NullPointerException}} will be thrown.

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