Merge Development

[domodwyer]

Includes:

• Reduced memory in bulk operations (Reduce memory allocation in bulk op #56)
• Native x509 authentication (Add proper DN construction #55)
• Better connection recovery (Recover from persistent "i/o timeout" or "Closed explicitly" pool errors #69)
• Example usage (auth: add an example for x509 authentication #75 and session: add example concurrent usage #78)

Thanks to:

• @bachue
• @csucu
• @feliixx

---

Throughput overview

Select throughput has increased by ~600 requests/second with slightly increased variance:

x => r2017.11.06-select-zipfian-throughput.log 
y => 9acbd68815499fc7f8fbb5931d643b8fd7804a80-select-zipfian-throughput.log 

     n   min   max median  average   stddev      p99
x 3600 49246 71368  66542 66517.26 2327.675 70927.01
y 3600 53304 72005  67151 67145.36 2448.534 71630.00

          62000       64000       66000        68000       70000       72000    
 |----------+-----------+-----------+------------+-----------+-----------+-----|
                              +---------+--------+                              
1          -------------------|         |        |--------------------          
                              +---------+--------+                              
                                 +---------+---------+                          
2    ----------------------------|         |         |--------------------      
                                 +---------+---------+                          
Legend: 1=data$x, 2=data$y

At 95% probablitiy:
===> average is statistically significant     (p=0.000000, diff ~628.094444)
===> variance is statistically significant    (p=0.002398)

• insert-latency.txt
• insert-throughput.txt
• select-zipfian-latency.txt
• select-zipfian-throughput.txt
• update-zipfian-latency.txt
• update-zipfian-throughput.txt

Note: latencies are approximations calculated from grouped data

[szank]

Shall we upgrade to 3.6.2 while we are at it ?