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 Sample 1. Code Sample / Example / Snippet of org.apache.hadoop.hdfs.protocol.UnregisteredDatanodeException

  public DatanodeDescriptor getDatanode(DatanodeID nodeID) throws IOException {

UnregisteredDatanodeException e = null;

DatanodeDescriptor node = datanodeMap.get(nodeID.getStorageID());

if (node == null)

return null;

if (!node.getName().equals(nodeID.getName())) {

e = new UnregisteredDatanodeException(nodeID, node);

NameNode.stateChangeLog.fatal("BLOCK* NameSystem.getDatanode: "

+ e.getLocalizedMessage());

throw e;

}

return node;

}




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