7. Protocol
• Java (DFSClient) Native Protocol
• Binary protocol
• Version sensitive
• All clients communicate with all nodes
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8. Protocol #2
• WebHDFS (Hadoop v1.0~)
• HTTP
• Protocol version defined
• All clients communicate with all nodes
• HttpFs (Hadoop v2.0~)
• HTTP proxy server for DFSClient
• All clients communicate with a node
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10. Performance
• HDFS is for sequencial access
• and for large (128MB or more) files
• HDFS is not for random access
• HBase is perfect software for you!
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