[HDFS-379] Cleanup and Document HDFS Client Intefaces and Protocol

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Assignee: Sanjay Radia
• Reporter: Sanjay Radia
• Created: 22/Aug/08 23:04
• Updated: 18/Jul/14 22:24
• Resolved: 18/Jul/14 22:24

Description

Cleanup and Document HDFS Client Intefaces and Protocol

The HDFS Client Interface/Protocols are

• Client to Namenode RPC protocol
• Client to Datanode RPC protocol
• Client to Datanode Streaming protocol

Work Items

• Cleanup FSConstants - HADOOP-4006
• Remove Unnecessary datatypes
  • Remove DFSFileInfo - FileStatus is sufficient. - HADOOP-4007
• Make the Client-Datanode streaming protocol concrete - HADOOP-4008
  The message exchange could be made concrete by declaring message data types contains the fields being marshaled.
• Declare the exceptions in the interface and also in class FileSystem and rethrow the encapsulated exception. HADOOP-4009

Sub-Tasks

• Cleanup HDFS FSConstants: Closed
• Remove DFSFileInfo - FileStatus is sufficient: Closed
• Make the Data transfer streaming protocol concrete: Resolved
• Declare HDFS exceptions in the HDFS interface and also in class FileSystem and rethrow the encapsulated exception: Resolved