Many thanks Chris
Anand Murali 11/7, 'Anand Vihar', Kandasamy St, MylaporeChennai - 600 004,
IndiaPh: (044)- 28474593/ 43526162 (voicemail)
On Thursday, April 16, 2015 11:27 PM, Chris Nauroth
<[email protected]> wrote:
Hello Anand,
MapReduce provides 2 similar but slightly different public APIs for writing
jobs. The original API is in the org.apache.hadoop.mapred package, and a
revised version is in the org.apache.hadoop.mapreduce package. The JavaDocs
provide examples of both:
http://hadoop.apache.org/docs/r2.6.0/api/org/apache/hadoop/mapred/JobConf.html
http://hadoop.apache.org/docs/r2.6.0/api/org/apache/hadoop/mapreduce/Job.html
A common problem is attempting to mix classes from one package with classes
from the other package. For example, you might be trying to call
org.apache.hadoop.mapreduce.Job#setMapperClass with a class that implements
org.apache.hadoop.mapred.Mapper instead of subclassing
org.apache.hadoop.mapreduce.Mapper.
I hope this helps.
Chris NaurothHortonworkshttp://hortonworks.com/
From: Anand Murali <[email protected]>
Reply-To: "[email protected]" <[email protected]>, Anand Murali
<[email protected]>
Date: Tuesday, April 14, 2015 at 2:52 AM
To: "[email protected]" <[email protected]>
Subject: Deprecation Error
Hi:
I am using Tom Whyte's text book on Hadoop 2.X for learning. However I have
installed 2.6 and using text code to get started. I get the following error on
the main class
anand_vihar@Latitude-E5540:~/hadoop-2.6.0/code$ javac -classpath $(hadoop
classpath) MaxTemperature.java
MaxTemperature.java:25: error: cannot find symbol
job.setMapperClass(MaxTemperatureMapper.class);
^
symbol: class MaxTemperatureMapper
location: class MaxTemperature
MaxTemperature.java:26: error: cannot find symbol
job.setReducerClass(MaxTemperatureReducer.class);
^
symbol: class MaxTemperatureReducer
location: class MaxTemperature
Note: MaxTemperature.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
2 errors
Can somebody advise me what are the equivalent API for
setMapperClass/SetReducer class, and where I can find the delta differences
between 2.x and 2,6.
Thanks,
Regards,
Anand Murali 11/7, 'Anand Vihar', Kandasamy St, MylaporeChennai - 600 004,
IndiaPh: (044)- 28474593/ 43526162 (voicemail)
