Ted,
It's hard for anyone here to support debugging CDH, please keep
discussions confined to their lists.
Arun
On Feb 5, 2011, at 6:17 AM, Ted Yu wrote:
Hi,
We use cdh3b2.
Recently we experience map task failure because of:
INFO [2011-02-04 18:17:36] (ExecUtil.java:261) - 2011-02-05
02:17:23,855
WARN org.apache.hadoop.mapred.TaskTracker: Error running child
INFO [2011-02-04 18:17:36] (ExecUtil.java:261) -
java.io.IOException: Split
class com.carrieriq.m2m.platform.mmp2.input.FileListInputSplit not
found
INFO [2011-02-04 18:17:36] (ExecUtil.java:261) - at
org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:326)
INFO [2011-02-04 18:17:36] (ExecUtil.java:261) - at
org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
INFO [2011-02-04 18:17:36] (ExecUtil.java:261) - at
org.apache.hadoop.mapred.Child.main(Child.java:170)
INFO [2011-02-04 18:17:36] (ExecUtil.java:261) - Caused by:
java.lang.ClassNotFoundException:
com.carrieriq.m2m.platform.mmp2.input.FileListInputSplit
INFO [2011-02-04 18:17:36] (ExecUtil.java:261) - at
java.net.URLClassLoader$1.run(URLClassLoader.java:202)
INFO [2011-02-04 18:17:36] (ExecUtil.java:261) - at
java.security.AccessController.doPrivileged(Native Method)
INFO [2011-02-04 18:17:36] (ExecUtil.java:261) - at
java.net.URLClassLoader.findClass(URLClassLoader.java:190)
INFO [2011-02-04 18:17:36] (ExecUtil.java:261) - at
java.lang.ClassLoader.loadClass(ClassLoader.java:307)
INFO [2011-02-04 18:17:36] (ExecUtil.java:261) - at
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
INFO [2011-02-04 18:17:36] (ExecUtil.java:261) - at
java.lang.ClassLoader.loadClass(ClassLoader.java:248)
INFO [2011-02-04 18:17:36] (ExecUtil.java:261) - at
java.lang.Class.forName0(Native Method)
INFO [2011-02-04 18:17:36] (ExecUtil.java:261) - at
java.lang.Class.forName(Class.java:247)
INFO [2011-02-04 18:17:36] (ExecUtil.java:261) - at
org
.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:
907)
INFO [2011-02-04 18:17:36] (ExecUtil.java:261) - at
org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:323)
INFO [2011-02-04 18:17:36] (ExecUtil.java:261) - ... 2 more
I found that the following config parameter was missing from the
underlying
Job Conf:
mapred.job.classpath.files
We use the following code:
Path dest = copyToDfs(jar, jobConf);
// add URL into class path for grid based job also to
ensure
flow validation can work using mmp command run
ClassUtil.addURL(jar.toURL());
DistributedCache.addFileToClassPath(dest, jobConf);
From log, I verified that ClassUtil.addURL() was called.
The following API doesn't have return code, no logging:
public static void addFileToClassPath(Path file, Configuration conf)
Please advise how I can debug this issue.
Thanks
