feat: Enable Multiplex session by default

Author: sakthivelmanii

.github/workflows/ci.yaml

@@ -36,6 +36,7 @@ jobs:
     - run: .kokoro/build.sh
       env:
         JOB_TYPE: test
+        GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS: false
   units-with-multiplexed-session:
     runs-on: ubuntu-latest
     strategy:
@@ -52,7 +53,6 @@ jobs:
     - run: .kokoro/build.sh
       env:
         JOB_TYPE: test
-        GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS: true
         GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS_PARTITIONED_OPS: true
         GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS_FOR_RW: true
   units-java8:
@@ -74,6 +74,7 @@ jobs:
     - run: .kokoro/build.sh
       env:
         JOB_TYPE: test
+        GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS: false
   units-with-multiplexed-session8:
     # Building using Java 17 and run the tests with Java 8 runtime
     name: "units-with-multiplexed-session (8)"
@@ -93,7 +94,6 @@ jobs:
       - run: .kokoro/build.sh
         env:
           JOB_TYPE: test
-          GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS: true
           GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS_PARTITIONED_OPS: true
           GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS_FOR_RW: true
   windows:
@@ -116,6 +116,7 @@ jobs:
     - run: .kokoro/build.bat
       env:
         JOB_TYPE: test
+        GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS: false
   dependencies:
     runs-on: ubuntu-latest
     strategy:

.github/workflows/integration-tests-against-emulator-with-multiplexed-session.yaml

@@ -38,5 +38,4 @@ jobs:
             -Dmaven.main.skip=true -fae verify
       env:
         JOB_TYPE: test
-        SPANNER_EMULATOR_HOST: localhost:9010
-        GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS: true
+        SPANNER_EMULATOR_HOST: localhost:9010

.github/workflows/integration-tests-against-emulator.yaml

@@ -37,6 +37,7 @@ jobs:
             -DtrimStackTrace=false -Dclirr.skip=true -Denforcer.skip=true \
             -Dmaven.main.skip=true -fae verify
       env:
+        GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS: false
         JOB_TYPE: test
         SPANNER_EMULATOR_HOST: localhost:9010
         GOOGLE_CLOUD_PROJECT: emulator-test-project

.kokoro/continuous/common.cfg

@@ -28,3 +28,8 @@ env_vars: {
   key: "GCLOUD_PROJECT"
   value: "gcloud-devel"
 }
+
+env_vars: {
+    key: "GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"
+    value: "false"
+}

.kokoro/nightly/common.cfg

@@ -29,3 +29,7 @@ env_vars: {
   value: "gcloud-devel"
 }
 
+env_vars: {
+    key: "GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"
+    value: "false"
+}

.kokoro/presubmit/graalvm-native-a.cfg

@@ -35,4 +35,9 @@ env_vars: {
 env_vars: {
   key: "IT_SERVICE_ACCOUNT_EMAIL"
   value: "[email protected]"
+}
+
+env_vars: {
+    key: "GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"
+    value: "false"
 }

.kokoro/presubmit/graalvm-native-b.cfg

@@ -35,4 +35,9 @@ env_vars: {
 env_vars: {
   key: "IT_SERVICE_ACCOUNT_EMAIL"
   value: "[email protected]"
+}
+
+env_vars: {
+    key: "GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"
+    value: "false"
 }

.kokoro/presubmit/graalvm-native-c.cfg

@@ -35,4 +35,9 @@ env_vars: {
 env_vars: {
   key: "IT_SERVICE_ACCOUNT_EMAIL"
   value: "[email protected]"
+}
+
+env_vars: {
+    key: "GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"
+    value: "false"
 }

.kokoro/presubmit/integration-directpath-enabled.cfg

@@ -35,4 +35,9 @@ env_vars: {
 env_vars: {
     key: "GOOGLE_SPANNER_ENABLE_DIRECT_ACCESS"
     value: "true"
+}
+
+env_vars: {
+    key: "GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"
+    value: "false"
 }

.kokoro/presubmit/integration-multiplexed-sessions-enabled.cfg

@@ -32,11 +32,6 @@ env_vars: {
   value: "java-it-service-account"
 }
 
-env_vars: {
-    key: "GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"
-    value: "true"
-}
-
 env_vars: {
     key: "GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS_PARTITIONED_OPS"
     value: "true"

.kokoro/presubmit/integration.cfg

@@ -32,3 +32,7 @@ env_vars: {
   value: "java-it-service-account"
 }
 
+env_vars: {
+    key: "GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"
+    value: "false"
+}

.kokoro/presubmit/samples.cfg

@@ -36,3 +36,8 @@ env_vars: {
   key: "ENABLE_BUILD_COP"
   value: "true"
 }
+
+env_vars: {
+    key: "GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"
+    value: "false"
+}

google-cloud-spanner/src/main/java/com/google/cloud/spanner/SessionPoolOptions.java

@@ -613,7 +613,7 @@ public static class Builder {
 
     // This field controls the default behavior of session management in Java client.
     // Set useMultiplexedSession to true to make multiplexed session the default.
-    private boolean useMultiplexedSession = false;
+    private boolean useMultiplexedSession = true;
 
     // This field controls the default behavior of session management for RW operations in Java
     // client.

google-cloud-spanner/src/test/java/com/google/cloud/spanner/MultiplexedSessionDatabaseClientTest.java

@@ -116,7 +116,7 @@ public void testMaintainer() {
   @Test
   public void testDisableMultiplexedSessionEnvVar() throws Exception {
     assumeTrue(isJava8() && !isWindows());
-    assumeFalse(System.getenv().containsKey("GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"));
+    assumeTrue(System.getenv().containsKey("GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"));
 
     // Assert that the mux sessions setting is respected by default.
     assertTrue(
@@ -147,7 +147,7 @@ public void testDisableMultiplexedSessionEnvVar() throws Exception {
   @Test
   public void testEnableMultiplexedSessionEnvVar() throws Exception {
     assumeTrue(isJava8() && !isWindows());
-    assumeFalse(System.getenv().containsKey("GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"));
+    assumeTrue(System.getenv().containsKey("GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"));
 
     // Assert that the mux sessions setting is respected by default.
     assertFalse(
@@ -178,7 +178,7 @@ public void testEnableMultiplexedSessionEnvVar() throws Exception {
   @Test
   public void testIgnoreMultiplexedSessionEnvVar() throws Exception {
     assumeTrue(isJava8() && !isWindows());
-    assumeFalse(System.getenv().containsKey("GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"));
+    assumeTrue(System.getenv().containsKey("GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"));
 
     // Assert that the mux sessions setting is respected by default.
     assertFalse(
@@ -209,7 +209,7 @@ public void testIgnoreMultiplexedSessionEnvVar() throws Exception {
   @Test
   public void testThrowExceptionMultiplexedSessionEnvVarInvalidValues() throws Exception {
     assumeTrue(isJava8() && !isWindows());
-    assumeFalse(System.getenv().containsKey("GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"));
+    assumeTrue(System.getenv().containsKey("GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"));
 
     // Assert that the mux sessions setting is respected by default.
     assertFalse(