Member since
11-25-2014
13
Posts
2
Kudos Received
3
Solutions
My Accepted Solutions
| Title | Views | Posted |
|---|---|---|
| 23142 | 12-16-2014 03:25 PM | |
| 1991 | 12-11-2014 01:35 PM | |
| 2798 | 11-25-2014 03:24 PM |
12-23-2014
06:21 AM
I tried that. It didn't work.
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12-16-2014
03:25 PM
1 Kudo
The solution I found was to add the following environment variables to spark-env.sh. The first 2 lines make spark-shell able to read snappy files from when run in local mode and the third makes it possible for spark-shell to read snappy files when in yarn mode. export JAVA_LIBRARY_PATH=$JAVA_LIBRARY_PATH:/usr/lib/hadoop/lib/native
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib/hadoop/lib/native
export SPARK_YARN_USER_ENV="JAVA_LIBRARY_PATH=$JAVA_LIBRARY_PATH,LD_LIBRARY_PATH=$LD_LIBRARY_PATH"
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12-16-2014
11:03 AM
Hi all, I am running a CDH5.2 cluster including Spark on YARN. When I run jobs through spark-shell with a local driver I am able to read and process Snappy compressed files, however as soon as I try to run the same scripts (wordcount for testing purposes) on YARN I get an UnsatisfiedLinkError (see below): java.lang.UnsatisfiedLinkError: org.apache.hadoop.util.NativeCodeLoader.buildSupportsSnappy()Z
org.apache.hadoop.util.NativeCodeLoader.buildSupportsSnappy(Native Method)
org.apache.hadoop.io.compress.SnappyCodec.checkNativeCodeLoaded(SnappyCodec.java:63)
org.apache.hadoop.io.compress.SnappyCodec.getDecompressorType(SnappyCodec.java:190)
org.apache.hadoop.io.compress.CodecPool.getDecompressor(CodecPool.java:176)
org.apache.hadoop.mapred.LineRecordReader.<init>(LineRecordReader.java:110)
org.apache.hadoop.mapred.TextInputFormat.getRecordReader(TextInputFormat.java:67)
org.apache.spark.rdd.HadoopRDD$$anon$1.<init>(HadoopRDD.scala:198)
org.apache.spark.rdd.HadoopRDD.compute(HadoopRDD.scala:189)
org.apache.spark.rdd.HadoopRDD.compute(HadoopRDD.scala:98)
org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:262)
org.apache.spark.rdd.RDD.iterator(RDD.scala:229)
org.apache.spark.rdd.MappedRDD.compute(MappedRDD.scala:31)
org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:262)
org.apache.spark.rdd.RDD.iterator(RDD.scala:229)
org.apache.spark.rdd.MappedRDD.compute(MappedRDD.scala:31)
org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:262)
org.apache.spark.rdd.RDD.iterator(RDD.scala:229)
org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:62)
org.apache.spark.scheduler.Task.run(Task.scala:54)
org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:180)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
java.lang.Thread.run(Thread.java:745) I have tried to set the library path to libsnappy.so.1 with a plethora of variables including LD_LIBRARY_PATH, JAVA_LIBRARY_PATH, SPARK_LIBRARY_PATH in spark-env.sh, and hadoop-env.sh, as well as spark.executor.extraLibraryPath, spark.executor.extraClassPath in spark-defaults.conf. I am at a loss as to what could be causing this problem since running locally works perfectly. Any pointers/ideas would be really helpful.
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Labels:
- Labels:
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Apache Hadoop
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Apache Spark
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Apache YARN
12-11-2014
01:35 PM
This was caused by not having the Llama ApplicationMaster role enabled in the cluster.
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12-08-2014
07:17 AM
Anyone seen this befor, or have any idea about the cause of the problem?
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11-25-2014
03:24 PM
According to an internet search this is a known issue with the packaging for CDH 5.2 on Debian and Ubuntu, however I was unable to find a JIRA for it.
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11-25-2014
02:32 PM
I've installed cloudera manager and CDH 5.2 on a cluster running Debian 7 and I just noticed that the spark-shell command doesn't work. rhaase@datanode1:/home/hdfs$ spark-shell /usr/lib/spark/bin/spark-shell: line 44: /usr/lib/spark/bin/utils.sh: No such file or directory Is this a bug in the packaging for the spark-shell package?
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Labels:
11-25-2014
10:50 AM
Here's a screenshot of the CDH version. I am running CDH 5.2 and the install was done via packages. Here's the full output I get on the wizard screen. Server Error A server error has occurred. Send the following information to Cloudera. Path: http://hdpadm1:7180/cmf/services/20/enableRM/command Version: Cloudera Express 5.2.0 (#60 built by jenkins on 20141012-2239 git: 179000584849e68f98ad2a7fe710723bd6c29c98) com.cloudera.cmf.service.CommandException:No command 'EnableLlamaRM' found for service 'DbService{id=20, name=impala}' at ServiceHandlerRegistry.java line 774 in com.cloudera.cmf.service.ServiceHandlerRegistry executeCommandHelper() Stack Trace: ServiceHandlerRegistry.java line 774 in com.cloudera.cmf.service.ServiceHandlerRegistry executeCommandHelper() ServiceHandlerRegistry.java line 759 in com.cloudera.cmf.service.ServiceHandlerRegistry executeCommand() ServiceHandlerRegistry.java line 754 in com.cloudera.cmf.service.ServiceHandlerRegistry executeCommand() OperationsManagerImpl.java line 1509 in com.cloudera.server.cmf.components.OperationsManagerImpl executeServiceCmd() EnableLlamaRMWizard.java line 200 in com.cloudera.server.web.cmf.wizard.service.impala.EnableLlamaRMWizard runFinalCommand() GenericAddRoleWizardController.java line 521 in com.cloudera.server.web.cmf.wizard.service.GenericAddRoleWizardController runCommand() <generated> line -1 in com.cloudera.server.web.cmf.wizard.service.GenericAddRoleWizardController$$FastClassByCGLIB$$3016baee invoke() MethodProxy.java line 191 in net.sf.cglib.proxy.MethodProxy invoke() Cglib2AopProxy.java line 688 in org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation invokeJoinpoint() ReflectiveMethodInvocation.java line 150 in org.springframework.aop.framework.ReflectiveMethodInvocation proceed() MethodSecurityInterceptor.java line 61 in org.springframework.security.access.intercept.aopalliance.MethodSecurityInterceptor invoke() ReflectiveMethodInvocation.java line 172 in org.springframework.aop.framework.ReflectiveMethodInvocation proceed() Cglib2AopProxy.java line 621 in org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor intercept() <generated> line -1 in com.cloudera.server.web.cmf.wizard.service.GenericAddRoleWizardController$$EnhancerByCGLIB$$7bda58dc runCommand() NativeMethodAccessorImpl.java line -2 in sun.reflect.NativeMethodAccessorImpl invoke0() NativeMethodAccessorImpl.java line 57 in sun.reflect.NativeMethodAccessorImpl invoke() DelegatingMethodAccessorImpl.java line 43 in sun.reflect.DelegatingMethodAccessorImpl invoke() Method.java line 606 in java.lang.reflect.Method invoke() HandlerMethodInvoker.java line 176 in org.springframework.web.bind.annotation.support.HandlerMethodInvoker invokeHandlerMethod() AnnotationMethodHandlerAdapter.java line 436 in org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter invokeHandlerMethod() AnnotationMethodHandlerAdapter.java line 424 in org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter handle() DispatcherServlet.java line 790 in org.springframework.web.servlet.DispatcherServlet doDispatch() DispatcherServlet.java line 719 in org.springframework.web.servlet.DispatcherServlet doService() FrameworkServlet.java line 669 in org.springframework.web.servlet.FrameworkServlet processRequest() FrameworkServlet.java line 585 in org.springframework.web.servlet.FrameworkServlet doPost() HttpServlet.java line 727 in javax.servlet.http.HttpServlet service() HttpServlet.java line 820 in javax.servlet.http.HttpServlet service() ServletHolder.java line 511 in org.mortbay.jetty.servlet.ServletHolder handle() ServletHandler.java line 1221 in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter() UserAgentFilter.java line 78 in org.mortbay.servlet.UserAgentFilter doFilter() GzipFilter.java line 131 in org.mortbay.servlet.GzipFilter doFilter() ServletHandler.java line 1212 in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter() JAMonServletFilter.java line 48 in com.jamonapi.http.JAMonServletFilter doFilter() ServletHandler.java line 1212 in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter() JavaMelodyFacade.java line 109 in com.cloudera.enterprise.JavaMelodyFacade$MonitoringFilter doFilter() ServletHandler.java line 1212 in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter() FilterChainProxy.java line 311 in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter() FilterSecurityInterceptor.java line 116 in org.springframework.security.web.access.intercept.FilterSecurityInterceptor invoke() FilterSecurityInterceptor.java line 83 in org.springframework.security.web.access.intercept.FilterSecurityInterceptor doFilter() FilterChainProxy.java line 323 in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter() ExceptionTranslationFilter.java line 113 in org.springframework.security.web.access.ExceptionTranslationFilter doFilter() FilterChainProxy.java line 323 in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter() SessionManagementFilter.java line 101 in org.springframework.security.web.session.SessionManagementFilter doFilter() FilterChainProxy.java line 323 in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter() AnonymousAuthenticationFilter.java line 113 in org.springframework.security.web.authentication.AnonymousAuthenticationFilter doFilter() FilterChainProxy.java line 323 in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter() RememberMeAuthenticationFilter.java line 146 in org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter doFilter() FilterChainProxy.java line 323 in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter() SecurityContextHolderAwareRequestFilter.java line 54 in org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter doFilter() FilterChainProxy.java line 323 in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter() RequestCacheAwareFilter.java line 45 in org.springframework.security.web.savedrequest.RequestCacheAwareFilter doFilter() FilterChainProxy.java line 323 in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter() AbstractAuthenticationProcessingFilter.java line 182 in org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter doFilter() FilterChainProxy.java line 323 in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter() LogoutFilter.java line 105 in org.springframework.security.web.authentication.logout.LogoutFilter doFilter() FilterChainProxy.java line 323 in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter() SecurityContextPersistenceFilter.java line 87 in org.springframework.security.web.context.SecurityContextPersistenceFilter doFilter() FilterChainProxy.java line 323 in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter() ConcurrentSessionFilter.java line 125 in org.springframework.security.web.session.ConcurrentSessionFilter doFilter() FilterChainProxy.java line 323 in org.springframework.security.web.FilterChainProxy$VirtualFilterChain doFilter() FilterChainProxy.java line 173 in org.springframework.security.web.FilterChainProxy doFilter() DelegatingFilterProxy.java line 237 in org.springframework.web.filter.DelegatingFilterProxy invokeDelegate() DelegatingFilterProxy.java line 167 in org.springframework.web.filter.DelegatingFilterProxy doFilter() ServletHandler.java line 1212 in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter() CharacterEncodingFilter.java line 88 in org.springframework.web.filter.CharacterEncodingFilter doFilterInternal() OncePerRequestFilter.java line 76 in org.springframework.web.filter.OncePerRequestFilter doFilter() ServletHandler.java line 1212 in org.mortbay.jetty.servlet.ServletHandler$CachedChain doFilter() ServletHandler.java line 399 in org.mortbay.jetty.servlet.ServletHandler handle() SecurityHandler.java line 216 in org.mortbay.jetty.security.SecurityHandler handle() SessionHandler.java line 182 in org.mortbay.jetty.servlet.SessionHandler handle() SecurityHandler.java line 216 in org.mortbay.jetty.security.SecurityHandler handle() ContextHandler.java line 766 in org.mortbay.jetty.handler.ContextHandler handle() WebAppContext.java line 450 in org.mortbay.jetty.webapp.WebAppContext handle() HandlerWrapper.java line 152 in org.mortbay.jetty.handler.HandlerWrapper handle() StatisticsHandler.java line 53 in org.mortbay.jetty.handler.StatisticsHandler handle() HandlerWrapper.java line 152 in org.mortbay.jetty.handler.HandlerWrapper handle() Server.java line 326 in org.mortbay.jetty.Server handle() HttpConnection.java line 542 in org.mortbay.jetty.HttpConnection handleRequest() HttpConnection.java line 928 in org.mortbay.jetty.HttpConnection$RequestHandler headerComplete() HttpParser.java line 549 in org.mortbay.jetty.HttpParser parseNext() HttpParser.java line 212 in org.mortbay.jetty.HttpParser parseAvailable() HttpConnection.java line 404 in org.mortbay.jetty.HttpConnection handle() SelectChannelEndPoint.java line 410 in org.mortbay.io.nio.SelectChannelEndPoint run() QueuedThreadPool.java line 582 in org.mortbay.thread.QueuedThreadPool$PoolThread run()
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11-25-2014
09:56 AM
I'm unable to enable YARN resource management for Impala via Llama. When I attempt to enable YARN resource management for Impala on the Dynamic Resouce Pools page I receive this error to the screen and logs: 2014-11-25 09:41:15,163 ERROR 960199638@scm-web-7149:com.cloudera.server.web.cmf.wizard.service.GenericAddRoleWizardController: Unexpected exception when calling runCommand: com.cloudera.cmf.service.CommandException: No command 'EnableLlamaRM' found for service 'DbService{id=20, name=impala}' at com.cloudera.cmf.service.ServiceHandlerRegistry.executeCommandHelper(ServiceHandlerRegistry.java:774) at com.cloudera.cmf.service.ServiceHandlerRegistry.executeCommand(ServiceHandlerRegistry.java:759) at com.cloudera.cmf.service.ServiceHandlerRegistry.executeCommand(ServiceHandlerRegistry.java:754) at com.cloudera.server.cmf.components.OperationsManagerImpl.executeServiceCmd(OperationsManagerImpl.java:1509) at com.cloudera.server.web.cmf.wizard.service.impala.EnableLlamaRMWizard.runFinalCommand(EnableLlamaRMWizard.java:200) at com.cloudera.server.web.cmf.wizard.service.GenericAddRoleWizardController.runCommand(GenericAddRoleWizardController.java:521) at com.cloudera.server.web.cmf.wizard.service.GenericAddRoleWizardController$$FastClassByCGLIB$$3016baee.invoke(<generated>) at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191) at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:688) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) at org.springframework.security.access.intercept.aopalliance.MethodSecurityInterceptor.invoke(MethodSecurityInterceptor.java:61) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:621) at com.cloudera.server.web.cmf.wizard.service.GenericAddRoleWizardController$$EnhancerByCGLIB$$7bda58dc.runCommand(<generated>) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176) at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:436) at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:424) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:669) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:585) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) 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$CachedChain.doFilter(ServletHandler.java:1221) at org.mortbay.servlet.UserAgentFilter.doFilter(UserAgentFilter.java:78) at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter.java:131) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212) at com.jamonapi.http.JAMonServletFilter.doFilter(JAMonServletFilter.java:48) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212) at com.cloudera.enterprise.JavaMelodyFacade$MonitoringFilter.doFilter(JavaMelodyFacade.java:109) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:311) at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:116) at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323) at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323) at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:101) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323) at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323) at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:146) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323) at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323) at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323) at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:182) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323) at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323) at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323) at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:125) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323) at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:173) at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237) at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.handler.StatisticsHandler.handle(StatisticsHandler.java:53) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.Server.handle(Server.java:326) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) at org.mortbay.jetty.HttpConnection$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)
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Labels:
- Labels:
-
Apache Impala
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Apache YARN
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Security