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https://issues.apache.org/jira/browse/HDFS-14110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chao Sun resolved HDFS-14110.
-----------------------------
Resolution: Duplicate
> NPE when serving http requests while NameNode is starting up
> ------------------------------------------------------------
>
> Key: HDFS-14110
> URL: https://issues.apache.org/jira/browse/HDFS-14110
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.8.2
> Reporter: Chao Sun
> Assignee: Chao Sun
> Priority: Minor
>
> In 2.8.2 we saw this exception when a security-enabled NameNode is still
> loading edits:
> {code:java}
> 2018-11-28 00:21:02,909 INFO org.apache.hadoop.util.JvmPauseMonitor: Detected
> pause in JVM or host machine (eg GC): pause of approximately 2068ms GC pool
> 'ParNew' had collection(s): count=1 time=2325ms 2018-11-28 00:21:05,768 WARN
> org.apache.hadoop.hdfs.web.resources.ExceptionHandler: INTERNAL_SERVER_ERROR
> java.lang.NullPointerException at
> org.apache.hadoop.hdfs.server.common.JspHelper.getTokenUGI(JspHelper.java:283)
> at org.apache.hadoop.hdfs.server.common.JspHelper.getUGI(JspHelper.java:226)
> at
> org.apache.hadoop.hdfs.web.resources.UserProvider.getValue(UserProvider.java:54)
> at
> org.apache.hadoop.hdfs.web.resources.UserProvider.getValue(UserProvider.java:42)
> 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.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$CachedChain.doFilter(ServletHandler.java:1221)
> at org.apache.hadoop.hdfs.web.AuthFilter.doFilter(AuthFilter.java:87) at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
> at
> org.apache.hadoop.http.HttpServer2$QuotingInputFilter.doFilter(HttpServer2.java:1353)
> at
> org.mortbay.jetty.servlet.ServletHandler$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.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)
> {code}
> Looking at the code, this is where the NPE happened (the line with
> {{verifyToken}}):
> {code:java}
> if (context != null) {
> final NameNode nn = NameNodeHttpServer.getNameNodeFromContext(context);
> if (nn != null) {
> // Verify the token.
> nn.getNamesystem().verifyToken(id, token.getPassword());
> }
> }
> {code}
> In {{NameNode::initialize}}, the namesystem is initialized _after_ the http
> server is started, and usually it takes a while before fsimage is loaded and
> {{namesystem}} becomes non-null:
> {code:java}
> if (NamenodeRole.NAMENODE == role) {
> startHttpServer(conf);
> }
> loadNamesystem(conf);
> {code}
> Perhaps it should throw a proper exception instead of failing with NPE.
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