Tanniru Govardhan 2013-07-26, 13:37
manish dunani 2013-07-26, 14:33
-Re: Context Object in Map Reduce
manish dunani 2013-07-26, 14:56
If u r using OutputCollector,Reporter then no need to use Context..Context
works same as OutputCollector and Reporter.
That is used to collect mapper's <key ,value> pair.
On Fri, Jul 26, 2013 at 8:03 PM, manish dunani <[EMAIL PROTECTED]> wrote:
> Can u please elaborate what is the code and what is error.??
> Then it will be much better to give the answer.
> Regards Manish Dunani..
> On Fri, Jul 26, 2013 at 7:07 PM, Tanniru Govardhan <
> [EMAIL PROTECTED]> wrote:
>> Hi everyone,
>> I am trying to pass a string variable from Driver class to Mapper class.
>> I came to know that i need to use context variable for this purpose.
>> But the Mapper method i have used has a signature without context object.
>> It is not allowing to change the method signature.(reporting syntax
>> Can anyone please suggest me what can I do regarding this?
>> I am very new to Map Reduce Programming.
>> Here is the code:
>> class Map<V> extends MapReduceBase implements Mapper<LongWritable, Text,
>> Text, IntWritable>
>> String myfilename;
>> private Text word = new Text();
>> private IntWritable var = new IntWritable();
>> public void map(LongWritable key, Text value, *Context context,*OutputCollector<Text, IntWritable> output, Reporter reporter)
>> *//here is the error *
>> throws IOException
>> Configuration conf = context.getConfiguration();
>> myfilename = conf.get("filename");
>> -- - - -- - -- -
>> public void compute() throws Exception
>> Configuration config = new Configuration();
>> config.set("filename", "Syn-100n-8t-2l-2k.vars");
>> JobConf conf = new JobConf(Hadoop_GNTS.class);
>> -- - - - -- - -
> MANISH DUNANI
> +91 9426881954,+91 8460656443
> [EMAIL PROTECTED]
+91 9426881954,+91 8460656443
Tanniru Govardhan 2013-07-26, 15:36