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From Josh Elser <>
Subject Re: Accumulo Map Reduce
Date Wed, 17 Dec 2014 03:37:45 GMT
If you're still getting connection refused errors, make sure that you 
started the YARN Resource Manager and Node Manager processes, typically 
via $HADOOP_PREFIX/sbin/ wrote:
> I using  Hadoop 2.5.0 ,I want to use MapReduce in online, do the table associated operation.
> <quote author='Josh Elser'>
> Accumulo provides an AccumuloInputFormat which allows Accumulo to be
> the source of data for a MapReduce job. We also provide a few
> OutputFormat implementations, the easiest to use being the
> AccumuloOutputFormat which will use BatchWriters to write mutations
> that you generate into Accumulo. You can look at
> for an end-to-end example of a MapReduce job.
> If you're trying to run your MapReduce job in local mode and getting a
> ConnectException, it sounds like you're not actually running in local
> mode as you expect. Can you provide more information as to what you're
> actually invoking? Also, are you using Hadoop 1 or Hadoop 2?
> On Mon, Dec 15, 2014 at 3:52 AM,<>
> wrote:
>> Hi:
>> There are several problems on MapReduce
>> 1、I wanted to know more about the Accumulo Map Reduce is a specific
>> function is to achieve what function? Use in what time?
>>   2、I want to do a MapReduce test in the local, there is always wrong.
>> MapReduce write their own should be how to run the test?
>> Caused by: Connection refused: no further
>> information
> </quote>
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