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From Anand Murali <anand_vi...@yahoo.com>
Subject Re: Hadoop imports Fail
Date Tue, 14 Apr 2015 05:34:36 GMT
Dear Naik:
I have already set path both for Hadoop and Java in .hadoop and run it prior to compilation
Export JAVA_HOME=/home/anand_vihar/jdk1.7.0_75Export HADOOP_INSTALL=/home/anand_vihar/hadoop-2.6.0PATH=:$PATH:$HADOOP_INSTALL/bin:$HADOOP_INSTALL/sbin:$HADOOP_INSTALL/share:$JAVA_HOME

So, is there not a way that the compiler goes thru all folders/jar and pick up the right class
and copile with just
$javac *.java.

If not is there a way to do so, else every time compilation needs to be done then a complete
path list has to be typed and who knows which class is located in which jar which is needed
for compilation, which when not found gives a compile error which becomes difficult to debug.
Thanks
Regards
 Anand Murali  11/7, 'Anand Vihar', Kandasamy St, MylaporeChennai - 600 004, IndiaPh: (044)-
28474593/ 43526162 (voicemail) 


     On Monday, April 13, 2015 9:58 PM, Ravindra Kumar Naik <ravin.iitb@gmail.com> wrote:
   

 You need to set classpath to hadoop jar

java -classpath <path/to/hadoop-2.6-core.jar>" MaxTemperatureMapper.java



On Mon, Apr 13, 2015 at 11:33 AM, Anand Murali <anand_vihar@yahoo.com> wrote:

Dear Mr. Ted:
Please find details
Last login: Sun Apr 12 16:33:18 2015 from localhost
anand_vihar@Latitude-E5540:~$ cd hadoop-2.6.0
anand_vihar@Latitude-E5540:~/hadoop-2.6.0$ . .hadoop
anand_vihar@Latitude-E5540:~/hadoop-2.6.0$ cd etc/hadoop
anand_vihar@Latitude-E5540:~/hadoop-2.6.0/etc/hadoop$ sh hadoop-env.sh
anand_vihar@Latitude-E5540:~/hadoop-2.6.0/etc/hadoop$ java -version
java version "1.7.0_75"
Java(TM) SE Runtime Environment (build 1.7.0_75-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.75-b04, mixed mode)
anand_vihar@Latitude-E5540:~/hadoop-2.6.0/etc/hadoop$ hadoop version
Hadoop 2.6.0
Subversion https://git-wip-us.apache.org/repos/asf/hadoop.git -r e3496499ecb8d220fba99dc5ed4c99c8f9e33bb1
Compiled by jenkins on 2014-11-13T21:10Z
Compiled with protoc 2.5.0
>From source with checksum 18e43357c8f927c0695f1e9522859d6a
This command was run using /home/anand_vihar/hadoop-2.6.0/share/hadoop/common/hadoop-common-2.6.0.jar
anand_vihar@Latitude-E5540:~/hadoop-2.6.0/etc/hadoop$ cd ..
anand_vihar@Latitude-E5540:~/hadoop-2.6.0/etc$ cd ..
anand_vihar@Latitude-E5540:~/hadoop-2.6.0$ start-dfs.sh --config /home/anand_vihar/hadoop-2.6.0/conf

Error Messages

$javac MaxTemperatureMapper.java
symbol: class Mapper
MaxTemperatureMapper.java:8: error: cannot find symbol
public class MaxTemperatureMapper extends Mapper<LongWritable, Text, Text, IntWritable>
                                                
^
  symbol: class LongWritable
MaxTemperatureMapper.java:8: error: cannot find symbol
public class MaxTemperatureMapper extends Mapper<LongWritable, Text, Text, IntWritable>
                                                              
^
  symbol: class Text
MaxTemperatureMapper.java:8: error: cannot find symbol
public class MaxTemperatureMapper extends Mapper<LongWritable, Text, Text, IntWritable>
                                                                    
^
  symbol: class Text
MaxTemperatureMapper.java:8: error: cannot find symbol
public class MaxTemperatureMapper extends Mapper<LongWritable, Text, Text, IntWritable>
                                                                          
^
  symbol: class IntWritable
MaxTemperatureMapper.java:15: error: cannot find symbol
    public void map(LongWritable key, Text value, Context context)
                    ^
  symbol:   class LongWritable
  location: class MaxTemperatureMapper
MaxTemperatureMapper.java:15: error: cannot find symbol
    public void map(LongWritable key, Text value, Context context)
                                      ^
  symbol:   class Text
  location: class MaxTemperatureMapper
MaxTemperatureMapper.java:15: error: cannot find symbol
    public void map(LongWritable key, Text value, Context context)
                                                 
^
  symbol:   class Context
  location: class MaxTemperatureMapper
MaxTemperatureMapper.java:25: error: cannot find symbol
            airtemperature = Integer.parseInt(line.substring(87,92));
            ^
  symbol:   variable airtemperature
  location: class MaxTemperatureMapper
MaxTemperatureMapper.java:28: error: cannot find symbol
        if (airTemparature != MISSING && quality.matches("[01459]"))
            ^
  symbol:   variable airTemparature
  location: class MaxTemperatureMapper
MaxTemperatureMapper.java:30: error: cannot find symbol
            context.write(new Text(year), new IntWritable(airTemperature));
                              ^
  symbol:   class Text
  location: class MaxTemperatureMapper
MaxTemperatureMapper.java:30: error: cannot find symbol
            context.write(new Text(year), new IntWritable(airTemperature));
                                              ^
  symbol:   class IntWritable
  location: class MaxTemperatureMapper
MaxTemperatureMapper.java:14: error: method does not override or implement a method from a
supertype
    @Override
    ^
17 errors

Hope someone can advise. Look forward to hearing.
Thanks
Regards
 Anand Murali  11/7, 'Anand Vihar', Kandasamy St, MylaporeChennai - 600 004, IndiaPh: (044)-
28474593/ 43526162 (voicemail) 


     On Sunday, April 12, 2015 5:59 PM, Ted Yu <yuzhihong@gmail.com> wrote:
   

 Can you tell us how you setup your project?
Do you use maven to build it ?
Please pastebin snippet of your code and the error you got. 
Cheers



On Apr 12, 2015, at 4:16 AM, Anand Murali <anand_vihar@yahoo.com> wrote:


Dear All:
I am new to hadoop2.6.0. I managed to set up and install Hadoop and Java 1.7. I wrote my first
hadoop code with import statements of Hadoop class files. However when I try and compile the
code, I get errors, which are reflective of the class files, which I suppose is not imported.
I have run hadoop-env.sh successfully before dameon startup. Can somebody advise.
Thanks
 Anand Murali  11/7, 'Anand Vihar', Kandasamy St, MylaporeChennai - 600 004, IndiaPh: (044)-
28474593/ 43526162 (voicemail)


   



  
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