java.io.IOException: Incompatible namespaceIDs in /tmp/hadoop-root/dfs/data: namenode namespaceID = 409052671; datanode namespaceID = 769845957

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    java.io.IOException: Incompatible namespaceIDs in /tmp/hadoop-root/dfs/data: namenode namespaceID = 409052671; datanode namespaceID = 769845957
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    Root Cause Analysis

    1. java.io.IOException

      Incompatible namespaceIDs in /tmp/hadoop-root/dfs/data: namenode namespaceID = 409052671; datanode namespaceID = 769845957

      at org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition()
    2. Apache Hadoop HDFS
      DataNode.main
      1. org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:233)
      2. org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:148)
      3. org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:298)
      4. org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:216)
      5. org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1283)
      6. org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1238)
      7. org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1246)
      8. org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1368)
      8 frames