Increase server selection prose test iteration to increase reliability.

Author: matthewdale

mongo/integration/server_selection_prose_test.go

@@ -66,11 +66,9 @@ func TestServerSelectionProse(t *testing.T) {
 			SetHosts(hosts[:2]).
 			SetPoolMonitor(tpm.PoolMonitor))
 
-		// Start 25 goroutines that each run 10 findOne operations. Run 25 goroutines instead of the
-		// 10 that the prose test specifies to reduce intermittent test failures caused by the
-		// random selections not being perfectly even over small numbers of operations.
+		// Start 10 goroutines that each run 10 findOne operations.
 		var wg sync.WaitGroup
-		for i := 0; i < 25; i++ {
+		for i := 0; i < 10; i++ {
 			wg.Add(1)
 			go func() {
 				defer wg.Done()
@@ -115,21 +113,21 @@ func TestServerSelectionProse(t *testing.T) {
 			SetHosts(hosts[:2]).
 			SetPoolMonitor(tpm.PoolMonitor))
 
-		// Sleep for 100ms to allow all server state discovery to complete. We need both servers to
+		// Sleep for 500ms to allow all server state discovery to complete. We need both servers to
 		// be selectable when we start running the test or the distribution of selected servers will
 		// be skewed. Unfortunately there's not currently another signal we can block on.
-		time.Sleep(100 * time.Millisecond)
+		time.Sleep(500 * time.Millisecond)
 
-		// Start 25 goroutines that each run 10 findOne operations. Run 25 goroutines instead of the
-		// 10 that the prose test specifies to reduce intermittent test failures caused by the
-		// random selections not being perfectly even over small numbers of operations.
+		// Start 25 goroutines that each run 25 findOne operations. Run more goroutines and
+		// operations than the prose test specifies to reduce intermittent test failures caused by
+		// the random selections not being perfectly even over small numbers of operations.
 		var wg sync.WaitGroup
 		for i := 0; i < 25; i++ {
 			wg.Add(1)
 			go func() {
 				defer wg.Done()
 
-				for i := 0; i < 10; i++ {
+				for i := 0; i < 25; i++ {
 					res := mt.Coll.FindOne(context.Background(), bson.D{})
 					assert.NoError(mt, res.Err(), "FindOne() error")
 				}