[HDFS-7112] LazyWriter should use either async IO or one thread per physical disk

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: HDFS-6581
• Fix Version/s: 2.6.0
• Component/s: datanode
• Hadoop Flags: Reviewed
• Assignee: Xiaoyu Yao
• Reporter: Arpit Agarwal
• Created: 21/Sep/14 21:17
• Updated: 01/Dec/14 03:10
• Resolved: 08/Oct/14 03:31

Description

The LazyWriter currently uses synchronous IO and a single thread. This limits the throughput to that of a single disk. Using either async overlapped IO or one thread per physical disk will improve the write throughput.