Hi Jay! thanks for the answear but i'm asking for what it works it sends? blockreport is an interface in DatanodeProtocol that has no declaration.
thanks! On Thu, Apr 1, 2010 at 5:50 PM, Jay Booth <jaybo...@gmail.com> wrote: > In DataNode: > public DatanodeProtocol namenode > > It's not a reference to an actual namenode, it's a wrapper for a network > protocol created by that RPC.waitForProxy call -- so when it calls > namenode.blockReport, it's sending that information over RPC to the namenode > instance over the network > > On Thu, Apr 1, 2010 at 5:50 AM, Alberich de megres > <alberich...@gmail.com>wrote: > >> Hi everyone! >> >> sailing throught the hdfs source code that comes with hadoop 0.20.2, i >> could not understand how hdfs sends blockreport to nameNode. >> >> As i can see, in >> src/hdfs/org/apache/hadoop/hdfs/server/datanode/DataNode.java we >> create this.namenode interface with RPC.waitForProxy call (wich i >> could not understand which class it instantiates, and how it works). >> >> After that, datanode generates block list report (blockListAsLongs) >> with data.getBlockReport, and call this.namenode.blockReport(..), >> inside namenode.blockReport it calls again namesystem.processReport. >> This leads to an update of block lists inside nameserver. >> >> But how it sends over the network this blockreport? >> >> Anyone can point me some light? >> >> thanks for all! >> (and sorry for the newbie question) >> >> Alberich >> >
