I am runing example of wordcout but encount an exception:
I googled and know lzo compression's license is incompatible with apache's
so it's not built in.
the question is I am using default configuration of hadoop 1.2.1, why
it need lzo?
anothe question is, what's Cleaning up the staging area mean?
./bin/hadoop jar hadoop-examples-1.2.1.jar wordcount /lili/data.txt /lili/test
14/02/12 14:06:10 INFO input.FileInputFormat: Total input paths to process : 1
14/02/12 14:06:10 INFO mapred.JobClient: Cleaning up the staging area
hdfs://172.19.34.24:8020/home/hadoop/dfsdir/hadoop-hadoop/mapred/staging/hadoop/.staging/job_201401080916_0216
java.lang.IllegalArgumentException: Compression codec
com.hadoop.compression.lzo.LzoCodec not found.
at
org.apache.hadoop.io.compress.CompressionCodecFactory.getCodecClasses(CompressionCodecFactory.java:116)
at
org.apache.hadoop.io.compress.CompressionCodecFactory.<init>(CompressionCodecFactory.java:156)
at
org.apache.hadoop.mapreduce.lib.input.TextInputFormat.isSplitable(TextInputFormat.java:47)
at
org.apache.hadoop.mapreduce.lib.input.FileInputFormat.getSplits(FileInputFormat.java:258)
at
org.apache.hadoop.mapred.JobClient.writeNewSplits(JobClient.java:1054)
at org.apache.hadoop.mapred.JobClient.writeSplits(JobClient.java:1071)
at org.apache.hadoop.mapred.JobClient.access$700(JobClient.java:179)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:983)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:936)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1190)
at
org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:936)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:550)
at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:580)
at org.apache.hadoop.examples.WordCount.main(WordCount.java:82)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at
org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:64)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.apache.hadoop.util.RunJar.main(RunJar.java:160)
Caused by: java.lang.ClassNotFoundException: com.hadoop.compression.lzo.LzoCodec
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at
org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:810)
at
org.apache.hadoop.io.compress.CompressionCodecFactory.getCodecClasses(CompressionCodecFactory.java:109)
