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https://issues.apache.org/jira/browse/MAPREDUCE-5157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13634193#comment-13634193
]
Zhijie Shen commented on MAPREDUCE-5157:
----------------------------------------
Bellow is the log I observed when executing hadoop-2.0.4-alpha/bin/hadoop jar
hadoop-1.1.1/hadoop-examples-1.1.1.jar
{code}
java.lang.NoClassDefFoundError:
org/apache/hadoop/mapred/lib/InputSampler$Sampler
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2436)
at java.lang.Class.getMethod0(Class.java:2679)
at java.lang.Class.getMethod(Class.java:1605)
at
org.apache.hadoop.util.ProgramDriver$ProgramDescription.<init>(ProgramDriver.java:60)
at org.apache.hadoop.util.ProgramDriver.addClass(ProgramDriver.java:103)
at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:50)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.RunJar.main(RunJar.java:212)
Caused by: java.lang.ClassNotFoundException:
org.apache.hadoop.mapred.lib.InputSampler$Sampler
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:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 12 more
{code}
> Sort in hadoop-1 examples is not binary compatible with hadoop-2 mapred.lib
> ---------------------------------------------------------------------------
>
> Key: MAPREDUCE-5157
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5157
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> Reporter: Zhijie Shen
> Assignee: Zhijie Shen
>
> In SORT example, org.apache.hadoop.mapred.lib.InputSampler.Sampler is used in
> hadoop-1. However, after upgrading to hadoop-2,
> org.apache.hadoop.mapred.lib.InputSampler is modified to extend
> org.apache.hadoop.mapreduce.lib.partition.InputSampler, and the inner class,
> Sampler, has been moved to the superclass. Therefore, hadoop-1 SORT can not
> find Sampler when it runs with hadoop-2 framework.
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