Hi, First warning is saying hadoop cannot load native library, usually a compression codec. In that case, hadoop will use java implementation instead, which is slower.
Second is caused by hadoop 1.x/2.x configuration key change. You're using a 1.x style key under 2.x, yet hadoop still guarantees backward compatibility. Third is saying that the main class of a hadoop application is recommanded to implement org.apache.hadoop.util.Tool<http://hadoop.apache.org/docs/current/api/org/apache/hadoop/util/Tool.html>, or else generic command line options (e.g., -D options) will not supported. On Sat, Apr 27, 2013 at 5:51 AM, <rkevinbur...@charter.net> wrote: > I am running a simple WordCount m/r job and I get output but I get five > warnings that I am not sure if I should pay attention to: > > *13/04/26 16:24:50 WARN util.NativeCodeLoader: Unable to load > native-hadoop library for your platform... using builtin-java classes where > applicable * > > *13/04/26 16:24:50 WARN conf.Configuration: session.id is deprecated. > Instead, use dfs.metrics.session-id * > > *13/04/26 16:24:50 WARN mapred.JobClient: Use GenericOptionsParser for > parsing the arguments. Applications should implement Tool for the same. * > > *13/04/26 16:24:51 WARN mapreduce.Counters: Group > org.apache.hadoop.mapred.Task$Counter is deprecated. Use > org.apache.hadoop.mapreduce.TaskCounter instead * > > *13/04/26 16:24:51 WARN mapreduce.Counters: Counter name MAP_INPUT_BYTES > is deprecated. Use FileInputFormatCounters as group name and BYTES_READ as > counter name instead* > > Any ideas on what these mean? The only one that I can see in the code is > the third one. I am using GenericOptionsParser as it is part of an example > that I copied. But I don't know why this is considered bad. > > Thank you. > > -- Regards, Ted Xu
