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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