[HDFS-7653] Block Readers and Writers used in both client side and datanode side

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Target Version/s: HDFS-7285
• Release Note: The design and implementation have changed a lot after this issue created. Due to the complexity and difference of client and datanode side read/write, we'll not solve this issue at current stage.
• Assignee: Li Bo
• Reporter: Li Bo
• Created: 22/Jan/15 02:31
• Updated: 21/Oct/15 07:31
• Resolved: 21/Oct/15 07:31

Description

There're a lot of block read/write operations in HDFS-EC, for example, when client writes a file in striping layout, client has to write several blocks to several different datanodes; if a datanode wants to do an encoding/decoding task, it has to read several blocks from itself and other datanodes, and writes one or more blocks to itself or other datanodes.

Issue Links

• Is contained by: HDFS-7679 Erasure Coding: unifying common constructs like coding work, block reader and block writer across client and DataNode