[HBASE-16305] Multi threaded scan performance bottlenecked on Connection

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Assignee: Unassigned
• Reporter: Elliott Neil Clark
• Created: 29/Jul/16 17:16
• Updated: 29/Jul/16 18:43

Description

Pretty simple repro. On a single region server host ~10 or more regions. Then for each region spawn a thread that starts a scan. Try an pull the scan as fast as possible.

If all the scans are created through the same connection then it's slow. If all the scans are created through different connections then the scan speed is doubled.

Since we recommend a single connection per application this is pretty surprising behavior.