docs: add read-write splitting with connection pooling heavy query performance test results (#455)

Author: joyc-bq

docs/Documentation.md

@@ -25,4 +25,5 @@
     - [Plugin Pipeline Performance Results](./development-guide/PluginPipelinePerformanceResults.md)
     - [Plugin Service](./development-guide/PluginService.md)
     - [Pipelines](./development-guide/Pipelines.md)
+    - [Read-Write Splitting Plugin Performance Results](./development-guide/ReadWriteSplittingPluginPerformanceResults.md)
 - [Known Limitations](./KnownLimitations.md)

docs/development-guide/DevelopmentGuide.md

@@ -125,6 +125,17 @@ See [here](PluginPipelinePerformanceResults.md#failover-performance-with-differe
 ![](../images/jdbc_wrapper_postgresql_efm_6000_1000_1.png)
 See [here](PluginPipelinePerformanceResults.md#enhanced-failure-monitoring-performance-with-different-failure-detection-configuration) for a more detailed performance breakdown.
 
+#### Read-Write Splitting and Internal Connection Pooling Performance Tests
+
+The diagram in this section shows the AWS JDBC Driver's performance when using the read-write splitting plugin, with or without connection pooling enabled. This test sets up a large number of connections in parallel; the initial connection is to the writer but will be changed to a random reader instance. The test executes a long query many times to simulate heavy queries.
+
+The average overhead time is measured as the average time difference between running the entire test with the read-write plugin and running the entire test without any plugins. The baseline overhead time is 0 because there are no plugins in this scenario and thus there is no plugin overhead.
+
+Note that the given overhead values represent the total overhead of running the entire test workflow rather than the overhead of executing a single method. The test executes 1 writer query and 1 read-only query from 10 connections simultaneously.
+
+![](../images/jdbc_wrapper_postgresql_readwritesplitting_connectionpooling_performance.png)
+See [here](ReadWriteSplittingPluginPerformanceResults.md#read-write-splitting-plugin-postgres-performance-results) for a more detailed performance breakdown.
+
 ### Running the Tests
 
 After building the AWS JDBC Driver you can now run the unit tests.

docs/development-guide/ReadWriteSplittingPluginPerformanceResults.md

@@ -0,0 +1,8 @@
+# Read-Write Splitting Plugin Performance Results
+
+### Read-Write Splitting Plugin Postgres Performance Results
+| Benchmark                                                   | Average Test Run Overhead Time | Units       | Percentage (%) Increase of Average Test Run Overhead from Baseline |
+|-------------------------------------------------------------|--------------------------------|-------------|--------------------------------------------------------------------|
+| No Plugin Enabled                                           | 0 (baseline)                   | ms/test-run | 0                                                                  |
+| Read-Write Splitting Plugin Enabled                         | +139.0                         | ms/test-run | +0.689                                                             |
+| Read-Write Splitting Plugin with Connection Pooling Enabled | +2.8                           | ms/test-run | +0.014                                                             |