p.s. Also, am unable to connect while doing hadoop/bin/hadoop fs -ls with the following error:
inti76.cse.psu.edu: starting tasktracker, logging to /i3c/hpcl/bus145/cse598g/hadoop/bin/../logs/hadoop-bus145-tasktracker-inti76.cse.psu.edu.out inti79.cse.psu.edu 36% hadoop/bin/hadoop fs -ls 11/04/12 17:37:34 INFO ipc.Client: Retrying connect to server: inti79.cse.psu.edu/130.203.58.207:54310. Already tried 0 time(s). 11/04/12 17:37:35 INFO ipc.Client: Retrying connect to server: inti79.cse.psu.edu/130.203.58.207:54310. Already tried 1 time(s). 11/04/12 17:37:36 INFO ipc.Client: Retrying connect to server: inti79.cse.psu.edu/130.203.58.207:54310. Already tried 2 time(s). On Tue, Apr 12, 2011 at 5:34 PM, bikash sharma <sharmabiks...@gmail.com>wrote: > Hi, > I changed some config. parameters in core-site/mapred.xml files and then > stopped dfs, mapred services. > While restarting them again, I am unable to do so and looking at the logs, > the following error occurs: > > 2011-04-12 17:27:39,343 INFO org.mortbay.log: Logging to > org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via > org.mortbay.log.Slf4jLog > 2011-04-12 17:27:39,453 ERROR org.apache.hadoop.mapred.TaskTracker: Can not > start task tracker because java.lang.NoClassDefFoundError: > org/json/JSONException > at java.lang.Class.forName0(Native Method) > at java.lang.Class.forName(Class.java:169) > at > org.apache.hadoop.metrics.ContextFactory.getContext(ContextFactory.java:132) > at > org.apache.hadoop.metrics.MetricsUtil.getContext(MetricsUtil.java:56) > at > org.apache.hadoop.metrics.MetricsUtil.getContext(MetricsUtil.java:45) > at > org.apache.hadoop.mapred.TaskTracker$ShuffleServerMetrics.<init>(TaskTracker.java:250) > at > org.apache.hadoop.mapred.TaskTracker.<init>(TaskTracker.java:917) > at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:2834) > Caused by: java.lang.ClassNotFoundException: org.json.JSONException > at java.net.URLClassLoader$1.run(URLClassLoader.java:202) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(URLClassLoader.java:190) > at java.lang.ClassLoader.loadClass(ClassLoader.java:307) > at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) > at java.lang.ClassLoader.loadClass(ClassLoader.java:248) > ... 8 more > > 2011-04-12 17:27:39,455 INFO org.apache.hadoop.mapred.TaskTracker: > SHUTDOWN_MSG: > /************************************************************ > SHUTDOWN_MSG: Shutting down TaskTracker at > inti79.cse.psu.edu/130.203.58.207 > ************************************************************/ > > > Also, am unable to do namenode -format to fresh start the cluster. > Any suggestions please? > > Thanks, > Bikash >
