Hi Group,
I have trouble running couple of examples provided by Hadoop. Below are the
error messages I have from the console, could you please advise what could
be the problem and probable solution?
09/06/17 16:30:29 INFO mapred.FileInputFormat: Total input paths to process
: 1
09/06/17 16:30:29 INFO mapred.FileInputFormat: Total input paths to process
: 1
09/06/17 16:30:29 INFO mapred.JobClient: Running job: job_200906171601_0009
09/06/17 16:30:30 INFO mapred.JobClient: map 0% reduce 0%
09/06/17 16:30:38 INFO mapred.JobClient: Task Id :
attempt_200906171601_0009_m_000000_0, Status : FAILED
java.io.IOException: hdfs://localhost:9000/user/root/words not a
SequenceFile
at
org.apache.hadoop.io.SequenceFile$Reader.init(SequenceFile.java:1458)
at
org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1431)
at
org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1420)
at
org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1415)
at
org.apache.hadoop.mapred.SequenceFileRecordReader.<init>(SequenceFileRecordR
eader.java:43)
at
org.apache.hadoop.mapred.SequenceFileInputFormat.getRecordReader(SequenceFil
eInputFormat.java:54)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:219)
at
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2198)
09/06/17 16:30:39 INFO mapred.JobClient: Task Id :
attempt_200906171601_0009_r_000000_0, Status : FAILED
java.lang.RuntimeException: java.lang.ClassNotFoundException:
org.apache.hadoop.examples.AggregateWordCount$WordCountPlugInClass
at
org.apache.hadoop.mapred.lib.aggregate.UserDefinedValueAggregatorDescriptor.
createInstance(UserDefinedValueAggregatorDescriptor.java:57)
at
org.apache.hadoop.mapred.lib.aggregate.UserDefinedValueAggregatorDescriptor.
createAggregator(UserDefinedValueAggregatorDescriptor.java:64)
at
org.apache.hadoop.mapred.lib.aggregate.UserDefinedValueAggregatorDescriptor.
<init>(UserDefinedValueAggregatorDescriptor.java:76)
at
org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorJobBase.getValueAggreg
atorDescriptor(ValueAggregatorJobBase.java:54)
at
org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorJobBase.getAggregatorD
escriptors(ValueAggregatorJobBase.java:65)
at
org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorJobBase.initializeMySp
ec(ValueAggregatorJobBase.java:74)
at
org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorJobBase.configure(Valu
eAggregatorJobBase.java:42)
at
org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:58)
at
org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:82)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:240)
at
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2198)
Caused by: java.lang.ClassNotFoundException:
org.apache.hadoop.examples.AggregateWordCount$WordCountPlugInClass
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:242)
at
org.apache.hadoop.mapred.lib.aggregate.UserDefinedValueAggregatorDescriptor.
createInstance(UserDefinedValueAggregatorDescriptor.java:52)
... 10 more
Thank You,
Shravan Kumar. M
Catalytic Software Ltd. [SEI-CMMI Level 5 Company]
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