Looks like mapreduce can not find json.jar in its class path. Which version of Hadoop are you using?
regards, Eric 2011/7/1 孙长 <[email protected]>: > hi,i have copied chukwa-hadoop-*-client.jar and json.jar to > HADOOP_HOME/lib, and restarted hadoop, but the MR job lanched by demux runs > error: > task error is as follows: > > Error: java.lang.ClassNotFoundException: org.json.JSONException > at java.net.URLClassLoader$1.run(URLClassLoader.java:200) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(URLClassLoader.java:188) > at java.lang.ClassLoader.loadClass(ClassLoader.java:307) > at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) > at java.lang.ClassLoader.loadClass(ClassLoader.java:252) > at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) > at java.lang.Class.forName0(Native Method) > at java.lang.Class.forName(Class.java:169) > at > org.apache.hadoop.chukwa.extraction.demux.processor.mapper.MapProcessorFactory.getProcessor(MapProcessorFactory.java:40) > at > org.apache.hadoop.chukwa.extraction.demux.Demux$MapClass.map(Demux.java:95) > at > org.apache.hadoop.chukwa.extraction.demux.Demux$MapClass.map(Demux.java:64) > at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50) > at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358) > at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307) > at org.apache.hadoop.mapred.Child.main(Child.java:170) > > At 2011-07-01 13:17:42，"Eric Yang" <[email protected]> wrote: > >>Did you copy chukwa-hadoop-*-client.jar and json.jar to >>HADOOP_HOME/lib, and restart hadoop? >> >>regards, >>Eric >> >>2011/6/30 孙长 <[email protected]>: >>> Hi, I am using chukwa 0.4 , and i start a collector and a agent on two >>> nodes, but i only got system metrics in mysql, no hadoop metrics like jvm, >>> dfs, mapred >>> dbAdmin.sh is running background, log4j.properties >>> and hadoop-metrics.properties in hadoop conf dir are set according to user >>> guide >>> no dfs, mapred logs in chukwa/log/metrics dir. >>> thank you ~ >>> >>> > > >
