[IMPALA-38] backend client connections not being cached causes an observable latency in secure clusters.

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 0.4
• Fix Version/s: Impala 0.5
• Assignee: Marcel Kinard
• Reporter: Ishaan Joshi
• Created: 30/Jan/13 23:27
• Updated: 20/Dec/15 00:04
• Resolved: 31/Jan/13 07:24

Description

Currently, backend impalads do not cache connections to the coordinator. On a secure cluster, this introduces a latency proportional to the # of backend clients involved in query execution, as the cost of establishing a secure connection is much higher than in the non-secure case.

When backend connections are cached, this latency is not seen for repeated query execution. Marcel has a patch that fixes the problem, documenting and assigning as appropriate.