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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-6687) nn.getNamesystem() may return NPE from JspHelper
Date Tue, 02 Aug 2016 22:15:20 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6687?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kihwal Lee resolved HDFS-6687.
------------------------------
    Resolution: Done

> nn.getNamesystem() may return NPE from JspHelper
> ------------------------------------------------
>
>                 Key: HDFS-6687
>                 URL: https://issues.apache.org/jira/browse/HDFS-6687
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.5.0
>            Reporter: Mit Desai
>            Assignee: Mit Desai
>
> In hadoop-2, the http server is started in the very early stage to show the progress.
If the user tries to get the name system, it may not be completely up and the NN logs will
have this kind of error.
> {noformat}
> 2014-07-14 15:49:03,521 [***] WARN
> resources.ExceptionHandler: INTERNAL_SERVER_ERROR
> java.lang.NullPointerException
>     at
> org.apache.hadoop.hdfs.server.common.JspHelper.getTokenUGI(JspHelper.java:661)
>     at
> org.apache.hadoop.hdfs.server.common.JspHelper.getUGI(JspHelper.java:604)
>     at
> org.apache.hadoop.hdfs.web.resources.UserProvider.getValue(UserProvider.java:53)
>     at
> org.apache.hadoop.hdfs.web.resources.UserProvider.getValue(UserProvider.java:41)
>     at
> com.sun.jersey.server.impl.inject.InjectableValuesProvider.getInjectableValues(InjectableValuesProvider.java:46)
>     at
> com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$EntityParamInInvoker.getParams(AbstractResourceMethodDispatchProvider.java:153)
>     at
> com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:203)
>     at
> com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
>     at
> com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288)
>     at
> com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
>     at
> com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
>     at
> com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
>     at
> com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
>     at
> com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1469)
>     at
> com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1400)
>     at
> com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1349)
>     at
> com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1339)
>     at
> com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
>     at
> com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
>     at
> com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:699)
>     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$CachedChain.doFilter(ServletHandler.java:1221)
>     at org.apache.hadoop.hdfs.web.AuthFilter.doFilter(AuthFilter.java:84)
>     at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
>     at org.mortbay.servlet.UserAgentFilter.doFilter(UserAgentFilter.java:78)
>     at com.yahoo.hadoop.GzipFilter.doFilter(GzipFilter.java:220)
>     at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
>     at
> org.apache.hadoop.http.HttpServer2$QuotingInputFilter.doFilter(HttpServer2.java:1223)
>     at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
>     at org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45)
>     at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
>     at org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45)
>     at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
>     at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
>     at
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
>     at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
>     at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
>     at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
>     at
> org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
>     at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
>     at org.mortbay.jetty.Server.handle(Server.java:326)
>     at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
>     at
> org.mortbay.jetty.HttpConnection$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}
> We need to check this and return appropriate message back to the user.



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