[SENTRY-1869] Try to use pool with idle connections first

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.0.0
• Component/s: Sentry
• Assignee: Alex Kolbasov
• Reporter: Alex Kolbasov
• Created: 26/Jul/17 17:46
• Updated: 27/Jul/17 17:56
• Resolved: 27/Jul/17 17:56

Description

When one of the servers fails, the next connection attempt may still try to connect to it. To reduce the chance of this happening it makes sense to first try connecting to a pool which has idle connections before attempting all pools. This should improve response time when one of the servers is down.