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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1914) HDFS should have a NamenodeProtocol to allow secondary namenodes and rebalancing processes to communicate with a primary namenode
Date Tue, 18 Sep 2007 00:03:44 GMT
HDFS should have a NamenodeProtocol to allow  secondary namenodes and rebalancing processes
to communicate with a primary namenode
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                 Key: HADOOP-1914
                 URL: https://issues.apache.org/jira/browse/HADOOP-1914
             Project: Hadoop
          Issue Type: New Feature
            Reporter: Hairong Kuang
            Assignee: Hairong Kuang


For the security purpose, it is nice to have a NamenodeProtocol to allow secondary namenodes
and rebalacing processes to communicate with a primary namenode. In the first version the
NamenodeProtocol is going to support one RPC:
   BlockLocations[] getBlocks(DatanodeID datanode, long size);
This RPC allows a rebalancing process to fetch a partial blocks map from a namenode. It returns
a list of blocks on the given datanode and its locations, whose total size is the given size.

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