If you've got existing R code, you might want to look at this http://www.quora.com/How-can-R-and-Hadoop-be-used-together.
Quora posting, also by Cloudera, or the rhipe R Hadoop package https://github.com/saptarshiguha/RHIPE/wiki
Mahout and Lucene/Solr offer some level of text analysis, although I would not call these complete text analysis packages.
What I've found are specific algorithms as opposed to a complete package: for example LDA for topic discovery -- Mahout and Yahoo Research (https://github.com/shravanmn/Yahoo_LDA) have Hadoop based implementations -- in the case of Yahoo_LDA the data is stored in HDFS, while the computation is essentially MPI based. Whether the algorithm reads data from HDFS store and uses another approach other than map reduce is another question.
On Apr 25, 2012, at 12:47 PM, Jagat wrote:
> There are Api which you can use , offcourse they are third party.
> Sent from Mobile , short and crisp.
> On 25-Apr-2012 8:57 PM, "Robert Evans" <[EMAIL PROTECTED]> wrote:
>> Hadoop itself is the core Map/Reduce and HDFS functionality. The higher
>> level algorithms like sentiment analysis are often done by others.
>> Cloudera has a video from HadoopWorld 2010 about it
>> And there are likely to be other tools like R that can help you out with
>> it. I am not really sure if mahout offers sentiment analysis or not, but
>> you might want to look there too http://mahout.apache.org/
>> --Bobby Evans
>> On 4/25/12 7:50 AM, "[EMAIL PROTECTED]" <
>> [EMAIL PROTECTED]> wrote:
>> I wanted to know if there are any existing API's within Hadoop for us to
>> do some text analysis like sentiment analysis, etc. OR are we to rely on
>> tools like R, etc. for this.
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