Hi, I'm trying to write an agent that will run on a datanode and will scan blocks on a that datanode. The logical thing to do is to look in the DataBlockScanner code, which lists all the blocks on a node, which is what I did. The problem is that the DataBlockScanner object is instantiated during the start-up of a DataNode, so a lot of objects needed (like FSDataSet) are already instantiated. Then, I tried with DataNode.getDataNode(), but it returned null (needless to say that the node is up-and-running). I'd be grateful if you can refer me to the right object or to a a guide.
I'm new in hdfs, so I'm sorry if its a trivial question. Thanks, Yaron
