The way I understand it...
Hadoop is a distributed file system that allows you to create folders in its own NameSpace, copy files to and from your local Linux FS. Set-up Hadoop configuration for local|pseudo-distributed|fully-distributed cluster.
You write your jobs using MapReduce API and execute them in Hadoop eco-system. I write mine in Java and would rate my experience, say at 6-7. I use Sqoop to import data into HDFS from RDMS MySql. I use Sqoop-generated classes to read data into the Mapper and design my own classes for the reducer which provide the required output.
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, November 07, 2012 10:33 AM
To: [EMAIL PROTECTED]
Subject: Map-Reduce V/S Hadoop Ecosystem
Hello Hadoop Champs,
Please give some suggestion..
As Hadoop Ecosystem(Hive, Pig...) internally do Map-Reduce to process.
My Question is
1). where Map-Reduce program(written in Java, python etc) are overtaking Hadoop Ecosystem.
2). Limitations of Hadoop Ecosystem comparing with Writing Map-Reduce program.
3) for writing Map-Reduce jobs in java how much we need to have skills in java out of 10 (?/10)
Please put some light over it.
Thanks & Regards
The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments.
WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email.
NOTICE: This e-mail message and any attachments are confidential, subject to copyright and may be privileged. Any unauthorized use, copying or disclosure is prohibited. If you are not the intended recipient, please delete and contact the sender immediately. Please consider the environment before printing this e-mail. AVIS : le présent courriel et toute pièce jointe qui l'accompagne sont confidentiels, protégés par le droit d'auteur et peuvent être couverts par le secret professionnel. Toute utilisation, copie ou divulgation non autorisée est interdite. Si vous n'êtes pas le destinataire prévu de ce courriel, supprimez-le et contactez immédiatement l'expéditeur. Veuillez penser à l'environnement avant d'imprimer le présent courriel