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POMapReduce job in headless environment fails N times due to AM Container exception from container-launch
 

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  1. POMapReduce job in headless environment fails N times due to AM Container exception from container-launch
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    <p>When running a map reduce job in a headless environment in MacOSX (e.g., when running jobs when ssh'ed as a particular user), I get the following exception or something like it…</p> <pre><code>2013-12-04 15:08:28,513 WARN org.apache.hadoop.yarn.server.resourcemanager.RMAuditLogger: USER=hadoop OPERATION=Application Finished - Failed TARGET=RMAppManager RESULT=FAILURE DESCRIPTION=App failed with state: FAILED PERMISSIONS=Application application_1386194876944_0001 failed 2 times due to AM Container for appattempt_1386194876944_0001_000002 exited with exitCode: 1 due to: Exception from container-launch: org.apache.hadoop.util.Shell$ExitCodeException: at org.apache.hadoop.util.Shell.runCommand(Shell.java:464) at org.apache.hadoop.util.Shell.run(Shell.java:379) at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:589) at org.apache.hadoop.yarn.server.nodemanager.DefaultContainerExecutor.launchContainer(DefaultContainerExecutor.java:195) at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.call(ContainerLaunch.java:283) </code></pre> <p>If instead, I log in as that user, the error does not occur and the MR job runs to conclusion, while a Java icon labeled "MRAppMaster" pops up in the dock.</p> <p>I have narrowed this down to the ResourceManager starting a Java process without passing along the <code>-Djava.awt.headless=true</code>. When this occurs in a headless environment, the JVM does not have permission to display in the root window. This has showed up in a number of other circumstances, and I've corrected each. </p> <p>This is not a question of permissions (something suggested elsewhere) or missing directories.</p> <p>But I'm at a loss as to how to affect the last of the offending attempts to access the root window without permission.</p> <p>I have added the <code>-Djava.awt.headless=true</code> option to the following:</p> <ul> <li>HADOOP_OPTS in hadoop-env.sh</li> <li>HADOOP_JOB_HISTORYSERVER_OPTS in mapred-env.sh YARN_OPTS in yarn-env.sh </li> <li>YARN_RESOURCEMANAGER_OPTS in yarn-env.sh (although that probably duplicates the YARN_OPTS </li> <li>mapred.{map|reduce}.child.java.opts and mapred.child.java.opts in mapred-site.xml</li> </ul> <p>What am I missing? Might I be better off adding this to my Java options globally?</p> <p>FYI, this is merely a pseudo cluster setup on a Mac, OS X 10.8.5, running Hadoop 2.2.0 downloaded from Apache with Java 1.6.0_65-b14. I did not use Homebrew or any other distribution. I am testing the pseudo-cluster with the WordCount example. </p> <p>Thanks.</p> <hr> <p>Ok. Mea culpa. I finally found all the settings to add… Search for all of the "opt" entries in the <a href="http://hadoop.apache.org/docs/r2.2.0/hadoop-mapreduce-client/hadoop-mapreduce-client-core/mapred-default.xml">mapred-default.xml</a> configuration instructions.</p> <p>Here they are in-situ…</p> <pre><code>&lt;property&gt; &lt;name&gt;mapred.child.java.opts&lt;/name&gt; &lt;value&gt;-Djava.awt.headless=true&lt;/value&gt; &lt;/property&gt; &lt;!-- add headless to default -Xmx1024m --&gt; &lt;property&gt; &lt;name&gt;yarn.app.mapreduce.am.command-opts&lt;/name&gt; &lt;value&gt;-Djava.awt.headless=true -Xmx1024m&lt;/value&gt; &lt;/property&gt; &lt;property&gt; &lt;name&gt;yarn.app.mapreduce.am.admin-command-opts&lt;/name&gt; &lt;value&gt;-Djava.awt.headless=true&lt;/value&gt; &lt;/property&gt; </code></pre> <p>I had also tried to accomplish the same thing by adding the parameter to _JAVA_OPTIONS in /etc/profile. Java picked it up, <strong>except when running the MRAppMaster</strong>!!!</p> <p>Hopefully this helps someone else.</p>
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