[HBASE-10010] eliminate the put latency spike on the new log file beginning

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.94.13
• Fix Version/s: 0.98.0, 0.96.1, 0.94.15, 0.99.0
• Component/s: regionserver
• Hadoop Flags: Reviewed
• Release Note: Forward port of a 0.89fb patch where we issue sync on WAL file construction to force immediate setup of write pipeline (and do it outside of locks so don't hold up writes during setup).
• Assignee: Liang Xie
• Reporter: Liang Xie
• Created: 20/Nov/13 08:26
• Updated: 16/Dec/13 18:47
• Resolved: 09/Dec/13 05:06

Description

In deed, the original finding came from fb, see HBASE-6813 for detailed discussion.
Through this improvement doesn't expect obvious gain on 95th or 99th latency, it still could make the response time more stable to me.

Issue Links

• is related to: HBASE-7216 sync hlog writer just after create it, so trigger addBlock and establish write pipeline before the first hlog sync