Hello, Whenever you are getting below error, trying to start a DN on a slave machine: java.io.IOException: Incompatible clusterIDs in /home/hadoop/dfs/data: namenode clusterID = ****; datanode clusterID = ****
It is because after you set up your cluster, you, for whatever reason, decided to reformat your NN. Your DNs on slaves still bear reference to the old NN. To resolve this simply delete and recreate data folder on that machine in local Linux FS, namely /home/hadoop/dfs/data. Restarting that DN's daemon on that machine will recreate data/ folder's content and resolve the problem. Happy Hadooping, AK47 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
