Yulia, I just ran "hadoop version" on my NN, separate SNN, and three separate DNs and all point to the exact the same build version. I know that you must install the exact same version on every machine in your cluster to run fully-dist Hadoop.
From: Yulia Stolin [mailto:[email protected]] Sent: Wednesday, October 31, 2012 3:45 PM To: [email protected] Subject: error in versions I have the following error in the cluster: 2012-10-31 21:15:49,414 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Incompatible build versions: namenode BV = 318bc781117fa276ae81a3d111f5eeba0020634f; datanode BV = 217a3767c48ad11d4632e19a22897677268c40c4 at org.apache.hadoop.hdfs.server.datanode.DataNode.handshake(DataNode.java:587) My master has : Subversion file:///data/1/tmp/nightly_2012-02-16_09-46-24_3/hadoop-0.20-0.20.2+923.195-1~maverick<file:///\\data\1\tmp\nightly_2012-02-16_09-46-24_3\hadoop-0.20-0.20.2+923.195-1~maverick> -r 217a3767c48ad11d4632e19a22897677268c40c4 And all slaves have Subversion file:///data/1/tmp/nightly_2012-03-20_13-13-48_3/hadoop-0.20-0.20.2+923.197-1~maverick<file:///\\data\1\tmp\nightly_2012-03-20_13-13-48_3\hadoop-0.20-0.20.2+923.197-1~maverick> -r 318bc781117fa276ae81a3d111f5eeba0020634f How can I down-grade mater to b195? Thanks 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 pr?sent courriel et toute pi?ce jointe qui l'accompagne sont confidentiels, prot?g?s par le droit d'auteur et peuvent ?tre couverts par le secret professionnel. Toute utilisation, copie ou divulgation non autoris?e est interdite. Si vous n'?tes pas le destinataire pr?vu de ce courriel, supprimez-le et contactez imm?diatement l'exp?diteur. Veuillez penser ? l'environnement avant d'imprimer le pr?sent courriel
