[#9797] YSQL: Stubs for ysql major version upgrade RPCs

Summary:
The pg15-upgrade branch has implementations of 3 RPCs needed for the YSQL major version upgrade:
 * StartYsqlMajorVersionUpgradeInitdb
 * IsYsqlMajorVersionUpgradeInitdbDone
 * RollbackYsqlMajorVersionUpgrade

In order to facilitate integration with tools such as YBA, add stubs for these methods to the master branch.

Upgrade/Downgrade safety:
No issues. New, unimplemented interface.

Jira: DB-1591

Test Plan:
Jenkins

Using a recent pg15-upgrade build, manually run:
  yb-admin ysql_major_version_upgrade_initdb
  yb-admin rollback_ysql_major_version_upgrade

Verify it shows something like the following errors:
  Error running ysql_major_version_upgrade_initdb: Not implemented (yb/master/catalog_manager.cc:3281): Unable to run initdb for ysql major version upgrade: Ysql major version upgrade is not supported
  Error running rollback_ysql_major_version_upgrade: Not implemented (yb/master/catalog_manager.cc:3294): Unable to roll back ysql major version upgrade: Ysql major version upgrade is not supported

Note yb-admin doesn't have a command for IsYsqlMajorVersionUpgradeInitdbDone because it implements its own blocking on the pg15-upgrade branch, but the code is similar for the 3 RPCs.

Reviewers: hsunder

Reviewed By: hsunder

Subscribers: vbansal, ybase, yql

Differential Revision: https://phorge.dev.yugabyte.com/D36940

Author: foucher

src/yb/master/catalog_manager.cc

@@ -3274,6 +3274,26 @@ Status CatalogManager::DdlLog(
   return sys_catalog_->FetchDdlLog(resp->mutable_entries());
 }
 
+Status CatalogManager::StartYsqlMajorVersionUpgradeInitdb(
+    const StartYsqlMajorVersionUpgradeInitdbRequestPB* req,
+    StartYsqlMajorVersionUpgradeInitdbResponsePB* resp,
+    rpc::RpcContext* rpc, const LeaderEpoch& epoch) {
+  return STATUS(NotSupported, "Ysql major version upgrade is not supported");
+}
+
+Status CatalogManager::IsYsqlMajorVersionUpgradeInitdbDone(
+    const IsYsqlMajorVersionUpgradeInitdbDoneRequestPB* req,
+    IsYsqlMajorVersionUpgradeInitdbDoneResponsePB* resp, rpc::RpcContext* rpc) {
+  return STATUS(NotSupported, "Ysql major version upgrade is not supported");
+}
+
+Status CatalogManager::RollbackYsqlMajorVersionUpgrade(
+    const RollbackYsqlMajorVersionUpgradeRequestPB* req,
+    RollbackYsqlMajorVersionUpgradeResponsePB* resp,
+    rpc::RpcContext* rpc, const LeaderEpoch& epoch) {
+  return STATUS(NotSupported, "Ysql major version upgrade is not supported");
+}
+
 namespace {
 
 Status ValidateCreateTableSchema(const Schema& schema, CreateTableResponsePB* resp) {

src/yb/master/catalog_manager.h

@@ -1098,6 +1098,21 @@ class CatalogManager : public tserver::TabletPeerLookupIf,
   Status DdlLog(
       const DdlLogRequestPB* req, DdlLogResponsePB* resp, rpc::RpcContext* rpc);
 
+  // Not implemented.
+  Status StartYsqlMajorVersionUpgradeInitdb(const StartYsqlMajorVersionUpgradeInitdbRequestPB* req,
+                                            StartYsqlMajorVersionUpgradeInitdbResponsePB* resp,
+                                            rpc::RpcContext* rpc, const LeaderEpoch& epoch);
+
+  // Not implemented.
+  Status IsYsqlMajorVersionUpgradeInitdbDone(
+      const IsYsqlMajorVersionUpgradeInitdbDoneRequestPB* req,
+      IsYsqlMajorVersionUpgradeInitdbDoneResponsePB* resp, rpc::RpcContext* rpc);
+
+  // Not implemented.
+  Status RollbackYsqlMajorVersionUpgrade(const RollbackYsqlMajorVersionUpgradeRequestPB* req,
+                                         RollbackYsqlMajorVersionUpgradeResponsePB* resp,
+                                         rpc::RpcContext* rpc, const LeaderEpoch& epoch);
+
   // Test wrapper around protected DoSplitTablet method.
   Status TEST_SplitTablet(
       const TabletInfoPtr& source_tablet_info,

src/yb/master/master_admin.proto

@@ -177,6 +177,29 @@ message DdlLogResponsePB {
   repeated DdlLogEntryPB entries = 2;
 }
 
+message StartYsqlMajorVersionUpgradeInitdbRequestPB {
+}
+
+message StartYsqlMajorVersionUpgradeInitdbResponsePB {
+  optional MasterErrorPB error = 1;
+}
+
+message IsYsqlMajorVersionUpgradeInitdbDoneRequestPB {
+}
+
+message IsYsqlMajorVersionUpgradeInitdbDoneResponsePB {
+  optional MasterErrorPB error = 1;
+  optional bool done = 2;
+  optional MasterErrorPB initdb_error = 3;
+}
+
+message RollbackYsqlMajorVersionUpgradeRequestPB {
+}
+
+message RollbackYsqlMajorVersionUpgradeResponsePB {
+  optional MasterErrorPB error = 1;
+}
+
 message CheckIfPitrActiveRequestPB {}
 
 message CheckIfPitrActiveResponsePB {
@@ -268,6 +291,13 @@ service MasterAdmin {
 
   rpc DdlLog(DdlLogRequestPB) returns (DdlLogResponsePB);
 
+  rpc StartYsqlMajorVersionUpgradeInitdb(StartYsqlMajorVersionUpgradeInitdbRequestPB)
+      returns (StartYsqlMajorVersionUpgradeInitdbResponsePB);
+  rpc IsYsqlMajorVersionUpgradeInitdbDone(IsYsqlMajorVersionUpgradeInitdbDoneRequestPB)
+      returns (IsYsqlMajorVersionUpgradeInitdbDoneResponsePB);
+  rpc RollbackYsqlMajorVersionUpgrade(RollbackYsqlMajorVersionUpgradeRequestPB)
+      returns (RollbackYsqlMajorVersionUpgradeResponsePB);
+
   rpc CheckIfPitrActive(CheckIfPitrActiveRequestPB)
       returns (CheckIfPitrActiveResponsePB);
 

src/yb/master/master_admin_service.cc

@@ -49,6 +49,9 @@ class MasterAdminServiceImpl : public MasterServiceBase, public MasterAdminIf {
       (GetCompactionStatus)
       (CreateTransactionStatusTable)
       (DdlLog)
+      (StartYsqlMajorVersionUpgradeInitdb)
+      (IsYsqlMajorVersionUpgradeInitdbDone)
+      (RollbackYsqlMajorVersionUpgrade)
       (DeleteNotServingTablet)
       (FlushSysCatalog)
       (SplitTablet)