[CALCITE-1117] Use commons httpclient instead of JDK http client

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: avatica-1.7.0
• Component/s: avatica
• Assignee: Josh Elser
• Reporter: Josh Elser
• Created: 01/Mar/16 23:12
• Updated: 14/May/16 23:42
• Resolved: 03/Mar/16 22:48

Description

I've been stumbling around, trying to get a better understanding of how HttpURLConnection works (with http/1.1), applying it to some of the knowledge I have with the distributed key-value stores on Hadoop I'm familiar with.

Along the way, I found lots of recommendations to move to Apache Commons HttpClient (http://hc.apache.org) with the broad suggestion that "it's just generally better". I mocked this up and was pleasantly surprised to find that this netted about a 20% improvement over the existing http client implementation (with a stubbed-out JDBC driver inside Avatica – just measuring Avatica itself).

Thankfully, we have an interface for the http client, so it should be easy to add a new implementation with a factory to do some client-side configuration.