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RE: error in versions

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
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?

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