[HDFS-6108] make the length of the range in sync_file_range() configurable

• Type: Improvement
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.3.0, 3.0.0-alpha1
• Component/s: datanode
• Labels: BB2015-05-TBR
• Assignee: Liang Xie Assign to me
• Reporter: Liang Xie
• Created: 17/Mar/14 07:23
• Updated: 12/May/16 18:12

Description

Current codebase has a hard code value for sync_file_range system call, we'd better to make it configurable, since different scenario probably has a different/better value for it. (ps: i found it's 1 * 1024 * 1024 in fb-20 branch)