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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3473) DN logs backtrace when running under jsvc and /jmx is loaded
Date Wed, 30 May 2012 17:54:23 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13285849#comment-13285849
] 

Hadoop QA commented on HDFS-3473:
---------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12530240/hadoop-8447.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    -1 javac.  The patch appears to cause the build to fail.

Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/2547//console

This message is automatically generated.
                
> DN logs backtrace when running under jsvc and /jmx is loaded
> ------------------------------------------------------------
>
>                 Key: HDFS-3473
>                 URL: https://issues.apache.org/jira/browse/HDFS-3473
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.0.0-alpha
>            Reporter: Andy Isaacson
>            Assignee: Andy Isaacson
>            Priority: Minor
>         Attachments: 95db1fa.txt, hadoop-8447.patch
>
>
> Running the data node under jsvc and requesting /jmx falls victim to a kernel bug http://marc.info/?l=linux-kernel&m=133788505209725&w=2
which results in EACCES when open()ing /proc/self/fd to attempt to count the open filedescriptors.
> Hopefully someday we will have kernels with this bug fixed; in the meantime, the log
spew which results is unpleasant:
> 12270 2012-05-15 21:04:41,683 ERROR org.apache.hadoop.jmx.JMXJsonServlet: getting attribute
OpenFileDescriptorCount of java.lang:type=OperatingSystem threw an exception
> 12271 javax.management.RuntimeErrorException: java.lang.InternalError: errno: 13 error:
Unable to open directory /proc/self/fd
> 12272 
> 12273         at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.rethrow(DefaultMBeanServerInterceptor.java:858)
> 12274         at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.rethrowMaybeMBeanException(DefaultMBeanServerInterceptor.java:869)
> 12275         at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:670)
> 12276         at com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:638)
> 12277         at org.apache.hadoop.jmx.JMXJsonServlet.writeAttribute(JMXJsonServlet.java:314)
> 12278         at org.apache.hadoop.jmx.JMXJsonServlet.listBeans(JMXJsonServlet.java:292)
> 12279         at org.apache.hadoop.jmx.JMXJsonServlet.doGet(JMXJsonServlet.java:192)
> 12280         at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
> 12281         at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
> 12282         at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
> 12283         at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1221)
> 12284         at org.apache.hadoop.http.HttpServer$QuotingInputFilter.doFilter(HttpServer.java:932)
> 12285         at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
> 12286         at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
> 12287         at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
> 12288         at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
> 12289         at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
> 12290         at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
> 12291         at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
> 12292         at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
> 12293         at org.mortbay.jetty.Server.handle(Server.java:326)
> 12294         at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
> 12295         at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)
> 12296         at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
> 12297         at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
> 12298         at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
> 12299         at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
> 12300         at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
> 12301 Caused by: java.lang.InternalError: errno: 13 error: Unable to open directory /proc/self/fd
> 12302 
> 12303         at com.sun.management.UnixOperatingSystem.getOpenFileDescriptorCount(Native
Method)
> 12304         at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)
> 12305         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 12306         at java.lang.reflect.Method.invoke(Method.java:597)
> 12307         at com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:167)
> 12308         at com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:96)
> 12309         at com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:33)
> 12310         at com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:208)
> 12311         at com.sun.jmx.mbeanserver.PerInterface.getAttribute(PerInterface.java:65)
> 12312         at com.sun.jmx.mbeanserver.MBeanSupport.getAttribute(MBeanSupport.java:216)
> 12313         at javax.management.StandardMBean.getAttribute(StandardMBean.java:358)
> 12314         at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:666)
> 12315         ... 25 more
> we should catch the RuntimeErrorException and make it a debug().

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