Thank you very much for you help. Now I can run wordcount under Hadoop 2.7.1. Thank you very much
在2015-12-11 19:50:01，周子博[email protected]写道： Dear Zhou, With Hadoop-0.20.2, you need to use JDK1.6. If you have a newer version of Java, it will be the problem. You can also use newer hadoop versions with newer JDK. Regards, Nooshin On Thu, Dec 10, 2015 at 2:26 PM, 周子博 <[email protected]> wrote: Hello I'm studying Hadoop these days. When I finished install hadoop under Fedora 19, I try to run wordcount but I can't. The error in userlogs as follow:(/logs/userlogs/attemp.../syslog) 2015-12-10 19:42:52,276 INFO org.apache.hadoop.metrics.jvm.JvmMetrics: Initializing JVM Metrics with processName=MAP, sessionId= 2015-12-10 19:42:52,427 WARN org.apache.hadoop.mapred.TaskTracker: Error running child java.lang.ClassCastException: org.apache.hadoop.mapreduce.lib.input.FileSplit cannot be cast to org.apache.hadoop.mapred.InputSplit at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:323) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307) at org.apache.hadoop.mapred.Child.main(Child.java:170) 2015-12-10 19:42:52,432 INFO org.apache.hadoop.mapred.TaskRunner: Runnning cleanup for the task I think the problem is the mapred and mapreduce cannot be matched.(Is it right?) I tried to find out the solution on the Internet. But all I find are telling about the difference between the mapred and mapreduce, but I still don't know how to fix the program. Hope I can get the answer. Thank you very very much. Yours, Zhou Sorry,I forgot to say my hadoop version is hadoop-0.20.2 . Should I try to install version hadoop-1.x or higher?
