i think it's a official uage ,you can type hadoop ,and read the last line
of the help output
,and i use CDH 4.4 ,i do not know if community version is support this usage
On Sat, Dec 14, 2013 at 2:27 AM, Vinod Kumar Vavilapalli <
vino...@hortonworks.com> wrote:
> That is not the correct usage. Yo
That is not the correct usage. You should do "hadoop jar
". Or if you are adventurous, directly invoke your class using
java and setting appropriate classpath.
Thanks,
+Vinod
On Dec 12, 2013, at 6:11 PM, ch huang wrote:
> hadoop ../test/WordCount
--
CONFIDENTIALITY NOTICE
NOTICE: This mes
每一个可运行的Jar包都要为它指定主类，要么通过manifest文件，要么通过命令行参数
2013/12/13 ch huang
> i find the reason
> no main class found
>
> # hadoop classpath
>
> /etc/hadoop/conf:/usr/lib/hadoop/lib/*:/usr/lib/hadoop/.//*:/usr/lib/hadoop-hdfs/./:/usr/lib/hadoop-hdfs/lib/*:/usr/lib/hadoop-hdfs/.//*:/usr/lib/hadoop-yarn/lib
i find the reason
no main class found
# hadoop classpath
/etc/hadoop/conf:/usr/lib/hadoop/lib/*:/usr/lib/hadoop/.//*:/usr/lib/hadoop-hdfs/./:/usr/lib/hadoop-hdfs/lib/*:/usr/lib/hadoop-hdfs/.//*:/usr/lib/hadoop-yarn/lib/*:/usr/lib/hadoop-yarn/.//*:/usr/lib/hadoop-mapreduce/lib/*:/usr/lib/hadoop-map
no ,it need not , hadoop can run class directly,i try in other box,it work
fine,
# hadoop com/test/demo/WordCount
Error: Could not find or load main class com.test.demo.WordCount
[root@CHBM224 test]# hadoop classpath
/etc/hadoop/conf:/usr/lib/hadoop/lib/*:/usr/lib/hadoop/.//*:/usr/lib/hadoop-hdfs
how did you package and compile your jar ? did you specify the main class
for the JAR file you generated ?
2013/12/13 ch huang
> hi,maillist:
>
> i rewrite WordCount.java and try to compile and run it but
> it say not find main class ,why?
>
> [root@CHBM224 myMR]# cat WordCount.ja
hi,maillist:
i rewrite WordCount.java and try to compile and run it but it
say not find main class ,why?
[root@CHBM224 myMR]# cat WordCount.java
import java.io.IOException;
import java.util.StringTokenizer;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.C
